TWI445864B - Washing machine - Google Patents

Description

washing machine

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a washing machine, and more particularly to a vertical type washing machine suitable for use in a washing and dewatering tank having an opening that can rotate an upper surface centering on a vertical or inclined axis.

In a general vertical automatic washing machine, the bottomed cylindrical outer groove is suspended and supported by a suspension rod for absorbing vibration, and the inner side of the outer groove is also a bottomed cylindrical shape and has a plurality of surrounding portions. The washing and dewatering tank of the dewatering hole is rotatably disposed about a vertical or inclined axis, and a laundry rotary disk (pulsator) for stirring is provided at the inner bottom of the groove. For example, Patent Document 1, Patent Document 4, and the like).

In such a washing machine, the laundry is dehydrated by rotating the washing and dewatering tank integrally with the washing and rotating disc at a high speed, but at this time, when there is an imbalance in weight around the rotating shaft due to the offset of the laundry, The washing and dewatering tank will generate a large vibration, and the outer tank will also oscillate sharply, which may cause abnormal noise and damage.

Therefore, in the past, there has been a method of detecting the imbalance of the weight caused by the offset of the laundry by means of mechanical detection and electrically detecting the two. In the conventional method, in the past, in order to detect abnormal vibration of the outer groove, a vibration detecting rod is disposed in the gap between the outer groove and the outer box, and when the outer groove contacts the vibration detecting rod, the switch is The operation is performed to stop the rotation of the laundry dewatering tank, and the unbalanced correction is performed by supplying water to the laundry dewatering tank and rotating the washing rotary disc to perform washing.

However, in the mechanical detection mode, in the middle of increasing the rotation speed of the washing and dewatering tank or in the high-speed dehydration rotation, it is mainly used to detect the large swing when the washing and dewatering tank generates a large swing, and is based on This detection stops the control of the rotation of the laundry dewatering tank. However, in the case of mechanical detection, it is impossible to detect the vibration above and below, or the abnormal vibration that cannot be detected by the mechanical detection method under high-speed rotation. In order to detect abnormal vibration more accurately and more quickly, in the past, there is The phenomenon of detecting the vibration of the laundry dewatering tank is detected electrically, and is used in combination with the method of detecting the imbalance.

In the case of such an electrical detection method, the following methods are known, that is, when the imbalance is large, the rotational speed of the washing and dewatering tank is inconsistent, so that the motor reaches the set constant. At the time of the high-speed dehydration rotation speed (for example, 1200 rpm), a change in the duty ratio of the PWM signal controlled by the motor formed by the inverter driving is detected (refer to, for example, Patent Document 1 or Patent Document 3), or is detected. A method of changing the amount of rotation of the motor (see, for example, Patent Document 2).

However, as described in Patent Document 2, the rotational speed or acceleration of the motor is detected based on a pulse signal generated by a Hall element attached to the motor, etc., but is detected due to various external factors or product differences. A doubt about an unbalanced state (abnormal vibration). Specifically, in the process of increasing the rotational speed of the washing and dewatering tank, when the washing and dewatering tank is vibrated or oscillated by the resonance point of the washing machine, the rotation inconsistency may be generated due to the influence, and the detection is not Equilibrium state. Further, when the difference in the mounting position of the magnet or the Hall element of the motor or the mechanical accuracy of the surface of the rotor of the motor is low, even in the normal rotation, it is determined that the rotation is inconsistent and detected. To be uneven.

Further, as described in Patent Document 1 or Patent Document 3, in the state where the rotational speed of the motor is maintained at the set target high-speed dehydration rotational speed (for example, 800 rpm), it is detected by the fluctuation of the duty ratio of the PWM signal. In the case of imbalance, when the imbalance is large, there will be doubts that a large vibration will occur before the unbalance detection is performed when the rotation speed reaches the constant target high-speed dehydration rotation speed.

Thus, when the imbalance is large, in view of the fact that there is a fear of generating a large vibration before reaching the target high-speed spin-drying speed and performing the unbalance detection, a stage is proposed in which the motor speed is maintained at the target high-speed spin speed. In other words, before the abnormal vibration is generated, it is detected that the imbalance is not present, thereby preventing the abnormal vibration from occurring in the initial stage of the rotation of the washing and dewatering tank (see, for example, Patent Document 4).

According to the technique of Patent Document 4, in the acceleration operation when the number of revolutions of the motor is increased from 120 rpm to 240 rpm, the operation ratio of the PWM signal for inverting the motor is obtained after 5 seconds from the start of acceleration, and This is set as the reference value. Then, the work ratio is obtained at predetermined time intervals, and the difference from the reference value is accumulated. When the accumulated value exceeds the predetermined range, it is determined that the eccentricity is large, and the dehydration is suspended and the washing operation is performed. In this way, when the motor rotation speed is increased, that is, the determination is made in the increase in the rotation speed of the washing and dewatering tank, if the cumulative value of the difference from the reference value is within the predetermined range within 10 seconds from the start of the acceleration, it is determined that The eccentricity is small and dehydration is performed by the target high-speed dehydration speed.

(previous technical literature) (Patent Literature)

(Patent Document 1) Japanese Patent Laid-Open No. 4-314496

(Patent Document 2) Japanese Patent Laid-Open Publication No. 2002-028393

(Patent Document 3) Japanese Laid-Open Patent Publication No. 2000-325695

(Patent Document 4) Japanese Patent Laid-Open Publication No. 2008-035925

In the fully automatic washing machine to which the present invention is applied, that is, as described above, the bottomed cylindrical outer groove is suspended and supported by a suspension rod for absorbing vibration, and the inner side of the outer groove is also a bottomed cylinder. A washing and dewatering tank having a plurality of dewatering holes formed in the periphery thereof is rotatably disposed about a vertical or inclined axis, and a vertical direction of the laundry rotary disk is rotatably provided at the inner bottom of the groove In the automatic washing machine, when the laundry (also referred to as the load) placed in the laundry dewatering tank is biased, that is, when the dehydration operation is performed under the eccentric load state, the low-speed operation region at the initial stage of the dehydration operation The lateral swing resonance point generated in the middle swings the resonance point with the increase of the rotational speed, and reaches the lateral swing resonance point as it approaches the set target high-speed spin-drying speed, and is determined to be an abnormal vibration state.

In view of the above, the present invention adopts the same detection according to the above-mentioned mechanical detection method, that is, as described above, by contacting the outer groove by vibration as described above for the lateral swing generated in the initial stage of the dehydration operation. In response to the vibration detecting lever and the switching action to stop the rotation of the washing and dewatering tank, the vertical swing is used to detect the longitudinal swing of the motor. 1 detection), and the operation of the PWM signal controlled by the motor driven by the inverter is compared with the longitudinal swing precursor detection (this is called the second detection), thereby being able to grasp beforehand The precursor of the abnormal vibration generated by the offset of the laundry (also referred to as the load) in the laundry dewatering tank can quickly and accurately prevent abnormal vibration, and can take measures such as stopping the washing machine early, without abnormal vibration. And a failure occurred.

The present invention also provides a re-use of the detection of the lateral sway generated by the high-speed dehydration rotation speed which is set close to the set (this is referred to as the third detection), from the initial stage of the dehydration operation to the constant high speed. In the process of the spin-drying speed, it is possible to grasp the precursor of the abnormal vibration generated by the offset of the laundry (also referred to as the load) placed in the laundry dewatering tank, and to prevent abnormal vibration quickly and accurately, and to take A technique in which the washing machine is stopped early, and the like, without causing malfunction due to abnormal vibration.

In addition, when the laundry (also referred to as the load) placed in the laundry dewatering tank is small, or if the laundry contains a large amount of water (also called a load), it is difficult to use the conventional method. Detected, but the present invention also provides a precursor to the abnormal vibration generated by the bias of the laundry (also referred to as load) placed in the laundry dewatering tank, even in such a case. This rapid and high-precision prevention of abnormal vibration can take measures such as stopping the washing machine early, and the like, without causing a malfunction due to abnormal vibration.

The present invention relates to a washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; and a motor for rotationally driving the washing and dewatering tank, comprising driving the motor by periodically opening and closing An inverter circuit of the switching element, and a speed detecting means for detecting the rotational speed of the motor; and determining the supply to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means The operation of the PWM signal is compared to the driving control means; and the washing machine for dehydrating the laundry in the washing and dewatering tank is rotated by rotating the washing and dewatering tank at a high speed, in order to detect the laundry around the rotating shaft during dehydration The imbalance of the washing and dewatering tank caused by the offset, and when the rotation speed of the motor is increased to the set target high-speed dehydration rotation speed, the lateral swing generated at the initial stage of the dehydration operation is determined by vibration Contacting the outer groove with the vibration detecting rod and causing the switch to operate to stop the rotation of the washing and dewatering tank The resulting longitudinal swing is performed by using the rotational speed of the motor to perform longitudinal swing precursor detection (referred to as the first detection), and using the motor-controlled PWM signal to operate the longitudinal swing precursor detection (will This is called the second detection).

Furthermore, as the lateral swing generated by the high-speed spin-drying speed of the target is approached, the following lateral swing precursor detection is performed (this is referred to as the third detection), that is, the motor is observed in the high-speed rotation state of the motor. The working ratio of the controlled PWM signal is set to be changed to the corrected working ratio of the condition at this time, and compared with the corrected working ratio by the reference operating ratio obtained before entering the high-speed rotating state. To determine the anomaly detection.

In this way, from the initial stage of the dehydration operation to the target high-speed dehydration rotation speed, it is possible to grasp the precursor of the abnormal vibration generated by the offset of the laundry (also referred to as the load) placed in the laundry dewatering tank, and quickly It is possible to prevent abnormal vibrations with high precision, and it is possible to adopt a technique in which the washing machine is stopped early, and the like, without causing malfunction due to abnormal vibration.

According to a first aspect of the invention, there is provided a washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; and a motor for rotationally driving the washing and dewatering tank, wherein the motor is driven to open and close periodically An inverter circuit of the switching element of the motor, and a speed detecting means for detecting the rotational speed of the motor; and determining the supply to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means The operation of the PWM signal is compared to the driving control means; and the washing machine for dehydrating the laundry in the washing and dewatering tank is performed by rotating the washing and dewatering tank at a high speed, wherein in order to detect the rotation around the rotating shaft Due to the imbalance of the laundry dewatering tank caused by the offset of the laundry, when the rotation speed of the motor is raised to the set target high-speed dehydration speed, the predetermined low speed lower target rotation speed is started to a predetermined low speed. The method of accelerating the motor in a certain amount until the upper target rotation speed is set, and is set in a region lower than the target high-speed dehydration rotation speed In the first constant acceleration zone, a value generated by a rotation speed difference every predetermined time when the rotation speed of the motor is increased to the low speed upper target rotation speed is compared with a predetermined threshold value. And a first detecting means for determining whether or not the laundry dewatering tank is uneven, and a control means for stopping the control of the motor when the first detecting means detects the imbalance of the washing and dewatering tank.

According to a second aspect of the invention, there is provided a washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; and a motor for rotating the washing and dewatering tank, wherein the motor is driven to open and close periodically An inverter circuit of the switching element of the motor, and a speed detecting means for detecting the rotational speed of the motor; and determining the supply to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means The operation of the PWM signal is compared to the driving control means; and the washing machine for dehydrating the laundry in the washing and dewatering tank is performed by rotating the washing and dewatering tank at a high speed, wherein in order to detect the rotation around the rotating shaft When the rotation speed of the motor is raised to the set target high-speed dehydration speed by the offset of the laundry, the fixed speed of the motor is set at a certain target rotation speed. a rotating zone, and having a reduction in a working ratio by maintaining a predetermined target rotational speed and a reference working ratio a second detecting means for determining whether or not the laundry dewatering tank is uneven, and a second detecting means for detecting the imbalance of the washing and dewatering tank when the second detecting means detects the imbalance of the laundry dewatering tank A control means for stopping the control of the motor.

According to a third aspect of the invention, there is provided a washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; and a motor for rotationally driving the washing and dewatering tank, wherein the motor is driven to open and close periodically An inverter circuit of the switching element of the motor, and a speed detecting means for detecting the rotational speed of the motor; and determining the supply to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means The operation of the PWM signal is compared to the driving control means; and the washing machine for dehydrating the laundry in the washing and dewatering tank is performed by rotating the washing and dewatering tank at a high speed, wherein in order to detect the rotation around the rotating shaft Due to the imbalance of the laundry dewatering tank caused by the offset of the laundry, when the rotation speed of the motor is raised to the set target high-speed dehydration speed, the predetermined low speed lower target rotation speed is started to a predetermined low speed. The method of accelerating the motor in a certain amount until the upper target rotation speed is set, and is set in a region lower than the target high-speed dehydration rotation speed In the first constant acceleration zone, a value generated by a rotation speed difference every predetermined time when the rotation speed of the motor is increased to the low speed upper target rotation speed is compared with a predetermined threshold value. a first detecting means for determining whether or not the laundry dewatering tank is unbalanced; and comparing the difference between the decrease in the operating ratio for maintaining the low-speed upper target rotational speed and the reference working ratio, and the threshold value, a second detecting means for determining whether or not the laundry dewatering tank is unbalanced; and wherein: when any one of the first detecting means and the second detecting means detects the imbalance of the washing and dewatering tank A control means for stopping the control of the motor.

According to a fourth aspect of the invention, there is provided a washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; and a motor for rotating the washing and dewatering tank, wherein the motor is driven to open and close periodically An inverter circuit of the switching element of the motor, and a speed detecting means for detecting the rotational speed of the motor; and determining the supply to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means The operation of the PWM signal is compared to the driving control means; and the washing machine for dehydrating the laundry in the washing and dewatering tank is performed by rotating the washing and dewatering tank at a high speed, wherein in order to detect the rotation around the rotating shaft Due to the imbalance of the laundry dewatering tank caused by the offset of the laundry, when the rotation speed of the motor is raised to the set target high-speed dehydration speed, the predetermined low speed lower target rotation speed is started to a predetermined low speed. The method of accelerating the motor in a certain amount until the upper target rotation speed is set, and is set in a region lower than the target high-speed dehydration rotation speed In the first constant acceleration zone, there is provided a first difference calculation means for calculating a deviation between a command value for increasing the rotational speed of the motor to the low-speed upper target rotational speed and a rise value of the actual rotational speed; The detecting means includes a first imbalance determining means for determining whether or not the laundry dewatering tank is unbalanced by comparing the value of the first difference calculating means with a predetermined threshold value; and the second detecting means And a method for setting a duty ratio of the PWM signal to a reference value setting means according to the low speed upper target rotation speed; and setting a reference operation ratio according to the reference value setting means, gradually increasing according to the low speed upper target rotation speed Obtaining a working ratio of the PWM signal, and calculating a second difference calculating means of the difference between the obtained working ratio and the reference working ratio decreasing function; and calculating the difference between the second difference calculating means and the predetermined threshold a second imbalance determining means for determining whether or not the laundry dewatering tank is unbalanced, and a control means for the first detecting means and the second detecting means Timekeeping means any one of the washing means detect uneven dewatering tank, control of the motor is stopped.

According to a fifth aspect of the invention, there is provided a washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; and a motor for rotating the washing and dewatering tank, wherein the motor is driven to open and close periodically An inverter circuit of the switching element of the motor, and a speed detecting means for detecting the rotational speed of the motor; and determining the supply to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means The operation of the PWM signal is compared to the driving control means; and the washing machine for dehydrating the laundry in the washing and dewatering tank is performed by rotating the washing and dewatering tank at a high speed, wherein in order to detect the rotation around the rotating shaft When the rotation speed of the motor is increased to the set high-speed dehydration rotation speed due to the imbalance of the laundry dewatering tank caused by the offset of the laundry, the first detecting means is provided to be from a predetermined low speed. The manner in which the lower target speed is started to a predetermined low speed upper target speed to accelerate the aforementioned motor is set to be higher than the aforementioned high speed a first calculation means for calculating a change in acceleration of a command value for increasing the rotational speed of the motor to the low-speed upper target rotational speed in the first constant acceleration region of the region having a low rotational speed; and The first unbalance determining means for determining whether or not the laundry dewatering tank is unbalanced by comparing the calculated value calculated by the first difference calculating means with a predetermined threshold value; and the second detecting means having: a target target rotational speed, the duty ratio of the PWM signal is set as a reference value setting means for the reference duty ratio; after the reference duty ratio is set according to the reference value setting means, the duty ratio of the PWM signal is gradually obtained according to the low speed upper target rotational speed And calculating a second difference calculation means of the difference between the obtained work ratio and the reference work-ratio decrement function (the set value determined as the reference work ratio decreases with time); and calculating by the aforementioned second difference The second imbalance determination means for determining the presence or absence of the imbalance of the laundry dewatering tank by comparing the difference calculated by the means with the predetermined threshold value And a control means, said current detecting means when the first and second detection means in any of the means detect the uneven washing and dewatering tub, to control the motor is stopped.

According to a sixth aspect of the invention, there is provided a washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; and a motor for rotationally driving the washing and dewatering tank, comprising periodically opening and closing to drive the foregoing An inverter circuit of the switching element of the motor, and a speed detecting means for detecting the rotational speed of the motor; and determining the supply to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means The operation of the PWM signal is compared to the driving control means; and the washing machine for dehydrating the laundry in the washing and dewatering tank is performed by rotating the washing and dewatering tank at a high speed, wherein in order to detect the rotation around the rotating shaft Due to the imbalance of the laundry dewatering tank caused by the offset of the laundry, when the rotation speed of the motor is raised to the set target high-speed dehydration speed, the predetermined low speed lower target rotation speed is started to a predetermined low speed. The method of accelerating the motor in a certain amount until the upper target rotation speed is set, and is set in a region lower than the target high-speed dehydration rotation speed. The first certain acceleration zone has: a first detecting means for detecting a longitudinal swing of the washing and dewatering tank; and detecting a longitudinal swing of the washing and dewatering tank according to a predetermined rotating speed of the motor after the determining time The second detecting means, wherein the first detecting means calculates a rising value of the rotational speed detected at a predetermined interval when the rotational speed of the motor is increased toward the low-speed upper target rotational speed during the determination time ( a first difference calculation means for calculating a cumulative value of a plurality of values of the difference; a means for calculating a cumulative value of a plurality of values of the rotational speed difference of the motor; and comparing the cumulative value with a predetermined threshold value a first imbalance determining means for determining whether or not the laundry dewatering tank is unbalanced; wherein the second detecting means is configured to set a duty ratio of the PWM signal as a reference operating ratio based on the low speed upper target rotational speed a setting means; after setting the reference working ratio according to the reference value setting means, gradually obtaining the duty ratio of the PWM signal based on the low speed upper target rotational speed, and Calculating a second difference calculation means for calculating a difference between the obtained work ratio and a reference duty ratio decreasing function (a set value determined as a value of a reference work ratio decreased over time); and calculating the second difference by the second difference calculation means Comparing the calculated difference with a predetermined threshold value to determine a second imbalance determining means for determining the imbalance of the laundry dewatering tank; and providing: in the first detecting means and the second detecting means When any means detects the imbalance of the laundry dewatering tank, the control means for stopping the control of the motor is performed.

According to a seventh aspect of the invention, there is provided a washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; and a motor for rotating the washing and dewatering tank, wherein the motor is driven to open and close periodically An inverter circuit of the switching element of the motor, and a speed detecting means for detecting the rotational speed of the motor; and determining the supply to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means The operation of the PWM signal is compared to the driving control means; and the washing machine for dehydrating the laundry in the washing and dewatering tank is performed by rotating the washing and dewatering tank at a high speed, wherein in order to detect the rotation around the rotating shaft Due to the imbalance of the laundry dewatering tank caused by the offset of the laundry, when the rotation speed of the motor is raised to the set target high-speed dehydration speed, the predetermined low speed lower target rotation speed is started to a predetermined low speed. The method of accelerating the motor in a certain amount until the upper target rotation speed is set, and is set in a region lower than the target high-speed dehydration rotation speed. The first certain acceleration zone has: a first detecting means for detecting a longitudinal swing of the washing and dewatering tank; and detecting a longitudinal swing of the washing and dewatering tank according to a predetermined rotating speed of the motor after the determining time The second detecting means, wherein the first detecting means calculates a rising value of the rotational speed detected at a predetermined interval when the rotational speed of the motor is increased toward the low-speed upper target rotational speed during the determination time ( a first difference calculation means for determining a difference between the laundry dewatering tanks by comparing the rising value (difference) with a predetermined threshold value; and the second The detecting means includes: setting a working ratio of the PWM signal as a reference value setting means according to the low speed upper target rotation speed; and setting a reference working ratio according to the reference value setting means, according to the low speed upper target The rotational speed, gradually obtain the working ratio of the aforementioned PWM signal, and calculate the obtained working ratio and the reference working ratio decreasing function (as the reference working ratio over time And a second difference calculation means for calculating a difference between the set values determined by the values; and comparing the difference calculated by the second difference calculation means with a predetermined threshold value to determine whether the laundry dewatering tank is not And a second imbalance determining means for equalizing the presence or absence of the equalization; and providing: stopping control of the motor when any one of the first detecting means and the second detecting means detects the imbalance of the washing and dewatering tank The means of control.

According to a third aspect of the invention, the washing machine according to any one of the third to seventh aspects of the present invention includes the operation unit that selects an operation mode of the washing machine, and the first detection when the felt stroke is selected in the operation unit And determining, by any one of the means and the second detecting means, whether the motor stop control state formed by the control means continuously reaches a predetermined number of consecutive state determining means when the imbalance of the washing dewatering tank is detected; When the determination by the state determination means does not continuously determine the predetermined number of times, the detection operation is resumed from the first detection means again, and when the determination is made continuously for a predetermined number of times, the predetermined laundry washing and dewatering tank is performed. After water injection, perform the cleaning procedure required to automatically cancel the imbalance.

According to a ninth aspect of the invention, there is provided a washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; and a motor for rotationally driving the washing and dewatering tank, comprising periodically opening and closing to drive the foregoing An inverter circuit of the switching element of the motor, and a speed detecting means for detecting the rotational speed of the motor; and determining the supply to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means The operation of the PWM signal is compared to the driving control means; and the washing machine for dehydrating the laundry in the washing and dewatering tank is performed by rotating the washing and dewatering tank at a high speed, wherein in order to detect the rotation around the rotating shaft When the rotation speed of the motor is raised to the set target high-speed dehydration rotation speed due to the imbalance of the laundry dewatering tank caused by the offset of the laundry, it is provided that the vibration is less likely to be affected by the vibration. The correction work ratio (α value) which is roughly determined by the speed of rotation and the load of the aforementioned washing and dewatering tank is set as the reference work ratio, and is rotated at a high speed. In the middle, the threshold value of the change due to the alpha value (the function of the rotational speed and the reference working ratio) is determined by the measurement of the reference working ratio, and the motor is stopped when the corrected working ratio is above or above the threshold value. Controlling, or the third detecting means for changing the rotational speed of the continuous dehydration process by the rotational speed above or above the threshold value; and the third detecting means is detected by the third detecting means When the laundry dewatering tank is unbalanced, the motor is controlled to stop the control.

According to a tenth aspect of the invention, in the washing machine according to any one of the first to eighth aspects of the present invention, there is provided a correction ratio that is substantially determined by a medium-speed rotation speed that is less susceptible to vibration and a load amount of the washing and dewatering tank (α value) is set as the reference work ratio, and in the high-speed rotation speed, the threshold value of the change due to the α value (the function of the rotation speed and the reference work ratio) is determined by the measurement of the reference duty ratio, when the correction work ratio is The third detecting means for performing the stop control of the motor at or above the threshold value or the change of the number of revolutions for continuing the spin-drying process by the rotational speed when the corrected working ratio is equal to or greater than the threshold value And a control means for stopping the control of the motor when any one of the first detecting means, the second detecting means, and the third detecting means detects the imbalance of the washing and dewatering tank.

According to a seventh aspect of the invention, in the washing machine according to any one of the first aspect of the present invention, the DC power supply voltage of the inverter circuit is rectified from a commercial power supply voltage and charged to a DC voltage of the capacitor. a second constant acceleration zone is set in the high-speed rotation zone from the detection of the second detecting means to the high-speed dehydration rotational speed of the target, and the third constant acceleration zone is provided with a third detecting means. The third detecting means includes: a working ratio obtaining means for gradually obtaining the duty ratio of the PWM signal; and when the DC voltage is in a state of being lowered from a predetermined constant state, the working ratio of the gradually obtained is set as a correction a correction means corresponding to a second correction operation ratio of the DC power supply voltage in the predetermined constant state; and determining the laundry dewatering tank by comparing the second correction operation ratio with a predetermined threshold value a third imbalance determination means having an imbalance; and having: detecting any of the foregoing first detection means, second detection means, and third detection means When the imbalance of the dewatering tank clothing, to the motor control means for stopping the control.

According to a twelfth aspect of the invention, in the washing machine according to any one of the first to eighth aspects of the invention, in the first aspect of the invention, the motor is accelerated from the low speed lower target rotational speed to the low speed upper target rotational speed. The aforementioned motor is in a state of being accelerated to a certain extent in the full acceleration state by the inverter circuit.

According to a thirteenth aspect of the invention, in the washing machine according to any one of the first to eighth aspects of the invention, the first detecting means, the detecting by the first detecting means, the low speed from the determination time The resonance point of the washing machine exists between the lower target rotation speed and the low speed upper target rotation speed.

According to a fourth aspect of the invention, in the washing machine according to any one of the fourth to eighth aspects of the invention, in the first aspect to the thirteenth invention, the difference in the second difference calculating means is calculated by the load in the washing and dewatering tank Change with quantity.

According to a fifth aspect of the invention, in the washing machine of the fourth aspect of the invention, the DC power supply voltage of the inverter circuit is a DC voltage that is rectified from a commercial power supply voltage and charged to a capacitor, and the DC voltage is located when the DC voltage is located. When the predetermined constant state is lowered, at least the reference operating ratio of the reference duty ratio and the obtained operating ratio is corrected to be corrected to the DC power supply voltage corresponding to the predetermined constant state. Work ratio.

According to a sixth aspect of the invention, in the washing machine according to any one of the fourth aspect of the invention, the reference work ratio and the correction operation ratio are average values of values obtained at predetermined time intervals, respectively. The work ratio obtained as described above is set to an intermediate value of values obtained at predetermined time intervals.

According to a seventeenth aspect of the invention, in the second aspect of the invention, in the second aspect of the invention, the second detecting means is when the correction operation ratio is equal to or greater than a predetermined value and the amount of laundry in the laundry dewatering tank is equal to or less than a certain value. get on.

According to a ninth aspect of the invention, in the washing machine of the fifteenth aspect, the second detecting means, when the amount of the laundry in the washing and dewatering tank cannot be measured, when the correction working ratio is equal to or greater than a certain value get on.

According to a nineteenth aspect of the invention, in the washing machine according to any one of the first to eighth aspects of the invention, in the dehydration program, the motor is maintained at the low-speed rotation state, and the 1 Detection by the detection means.

According to a ninth aspect of the invention, in the washing machine according to any one of the eleventh invention, the third imbalance determining means is a plural of the latest value obtained by comparing the second correction operation with each predetermined time. The cumulative value of the values is compared with a predetermined threshold to determine the presence or absence of the imbalance in the laundry dewatering tank.

In the present invention, in the low-speed rotation, the longitudinal vibration can be detected by the first detecting means and the second detecting means, and in the high-speed rotation, the lateral vibration can be detected by the third detecting means, By using these methods alone or in combination, from the initial stage of the dehydration operation to the target high-speed dehydration rotation speed, the abnormality caused by the offset of the laundry (also referred to as the load) placed in the laundry dewatering tank can be grasped beforehand. The precursor of vibration can prevent abnormal vibrations quickly and accurately, and measures such as stopping the washing machine early can be taken without causing malfunction due to abnormal vibration.

In addition, in the present invention, the first detecting means and the second detecting means detect the abnormal vibration of the longitudinal swing, and the first detecting means causes the rotational speed of the motor to move to the low speed upper target. The value generated by the difference in the rotational speed every predetermined time when the rotational speed is increased is compared with a predetermined threshold value to determine the presence or absence of the imbalance of the laundry dewatering tank, and the second detecting means is used to maintain The difference between the reduction of the working ratio of the low-speed upper target rotation speed and the reduction of the reference working ratio is compared with the threshold value to determine the presence or absence of the imbalance of the washing and dewatering tank, so that the abnormal longitudinal vibration is detected under low-speed rotation. Very good.

Further, in the present invention, in the comparison of the duty ratio and the threshold value, the correction work ratio and the reference duty ratio by the power source voltage are set as the detection of the abnormal vibration, so that the load amount and the load amount are not The detection action is achieved under the influence of changes in the control circuit and the washing machine.

Further, in the present invention, the change in the duty ratio at the time of high-speed rotation is observed, and the threshold value is switched by the reference duty ratio to perform the stop control of the motor as the third abnormal vibration for detecting the lateral swing under the high-speed rotation. The detection means can quickly detect the abnormality of the lateral swing under high-speed rotation.

Further, in the present invention, the change in the working ratio at high-speed rotation is observed, and the threshold value is switched by the reference duty ratio, and the target high-speed spin-drying speed is switched to continue the dehydration process as the abnormal vibration of the lateral swing under high-speed rotation. Detection, so the scheduled dehydration can be ended.

Further, in the present invention, the cumulative value of the rotational speed difference is used as the detection of the abnormal vibration of the longitudinal oscillation under the low-speed rotation, and the cumulative value of the corrected working ratio is used as the detection of the abnormal vibration of the lateral oscillation under the high-speed rotation, so Detection can be eliminated by eliminating the effects of errors in the control circuit's program.

In addition, in the present invention, when the laundry in the laundry dewatering tank contains a large amount of water like a blanket, the abnormality detection can be performed well, and when the stop of the motor formed by the abnormality detection continuously reaches a predetermined number of times After the predetermined water injection to the laundry dewatering tank, the cleaning process for automatically eliminating the imbalance is also performed, and the effect of automatically eliminating the imbalance can be automatically eliminated.

The present invention is directed to a laundry dewatering tank that is rotatably disposed in an outer tank around a rotating shaft, and includes a motor for rotationally driving the washing and dewatering tank, including periodically switching An inverter circuit for driving a switching element of the motor, and a speed detecting means for detecting a rotational speed of the motor; and determining a supply to the reverse phase according to a rotational speed and a motor current detected by the speed detecting means The operation of the PWM signal of the circuit is compared to the driving control means; and in the washing machine for dehydrating the laundry in the washing and dewatering tank by rotating the washing and dewatering tank at a high speed, in order to detect the rotation axis during dehydration The imbalance of the aforementioned laundry dewatering tank caused by the offset of the laundry, in the process of the speed of the motor reaching the set high-speed dehydration speed, the laundry that is placed in the washing and dewatering tank can be grasped beforehand (also Precursor of abnormal vibration generated by the offset called load), which prevents abnormal vibration quickly and accurately, and can take the washing machine early Only measures, but will not produce due to a technical failure of the abnormal vibration.

Therefore, in the present invention, the lateral oscillation generated at the initial stage of the dehydration operation is a mechanical detection method of stopping the rotation of the washing and dewatering tank by contacting the outer groove with the vibration detecting rod by vibration and causing a switch to operate. For the detection of vibration, when the vibration is detected at a higher speed, there is vibration that cannot be detected by the mechanical detection method, so the longitudinal oscillation at the time of low-speed rotation and the lateral oscillation at the time of high-speed rotation are based on The detection by the program of the control unit that controls the rotational speed of the motor is performed as the detection.

As the electric detection method, the change of the motor rotation speed is detected to know the abnormal vibration caused by the longitudinal swing in the low speed state of the dehydration program, and when the abnormal vibration is generated, the longitudinal swing precursor detection is performed by stopping the motor ( This is called the first detection), and detects the change of the working ratio of the motor-controlled PWM signal in the low-speed rotation state of the motor. When an abnormal vibration occurs, the longitudinal swing precursor detection is performed by stopping the motor (will This is called the second detection). In addition, in the high-speed rotation state of the motor, the following lateral swing precursor detection is performed (this is referred to as the third detection), that is, the operation ratio of the PWM signal controlled by the motor in the high-speed rotation state of the motor is observed. It is assumed that the correction operation ratio is corrected to the change of the condition at this time, and the abnormality detection is determined by comparing the threshold value of the reference operation ratio obtained before entering the high-speed rotation state with the corrected operation ratio.

In the general washing machine, the mechanical detection method is adopted, and in this way, a certain electric vibration detecting method is adopted. The washing machine of the present invention also adopts a mechanical detecting method, and in this way, a specific electric vibration detecting is adopted. Measuring method. The specific electrical vibration detection method of the present invention includes the first detection, the second detection, and the third detection, which are described later, but it is not necessary to have all the detection methods, for example, by having the first detection. And the second detector, the first detection and the third detection, or the second detection and the third detection, and the first detection, the second detection, the third detection, etc. The selective combination of such detections constitutes a person detecting abnormal vibrations.

The following describes examples of the invention.

(Example 1)

Embodiments of the washing machine of the present invention will be described below based on the drawings. The washing machine SW of the present invention is an inner tank 1 having a bottomed cylindrical shape made of a synthetic resin, and a bottomed cylindrical outer casing 4 made of a resin rod. The shock absorber 5 constituted by the damper mechanism 5B (one in the front and the rear in the first drawing, but actually two in the front and the rear) is swingably supported by the ground, thereby preventing the vibration of the outer tank 4 from being transmitted to Outer box 1. The laundry input opening 2 can be opened and closed by being folded into a double-fold upper cover 3A when erected. Inside the outer tank 4, the washing and dewatering tank 6 having a plurality of water-passing holes 7 in the peripheral wall is rotatably pivoted about a groove shaft 8 extending substantially perpendicularly at the center of the bottom wall support. At the inner bottom portion of the laundry dewatering tank 6, a washing rotary disk (in the present invention, a stirring body) 9 for stirring the laundry is rotatably provided around the wing shaft 10 which is fitted to the inner side of the groove shaft 8. The upper opening 4K of the outer tub 4 has a cover 4B around the periphery of the upper opening 4K, and the opening of the cover 4B can be opened and closed by the inner lid 3B. In order to achieve cost reduction, the outer tank 4 is made of a polypropylene resin. Further, in order to secure the strength and rust preventive laundry dewatering tank 6, it is made of stainless steel.

At the bottom of the outer tank 4, a drive mechanism 11 for driving the above-described washing and dewatering tank 6 and the washing and turning disc 9 is provided. The drive mechanism 11 includes a motor 12 that is disposed coaxially with the slot shaft 8 and the wing shaft 10 and belongs to a DC brushless motor. The rotational driving force of the motor 12 is switched to be transmitted only to the wing shaft 10 or to the wing shaft. The clutch mechanism 13 of both the slot shaft 8 and the slot shaft 8; and the speed reduction mechanism 14 that decelerates the rotation speed at a predetermined reduction ratio when the rotational driving force of the motor 12 is transmitted only to the wing shaft 10. The clutch mechanism 13 cuts the washing rotary disk 9 away from the groove shaft 8 and the wing shaft 10 by unidirectional or bidirectional rotation by the action of the torque motor 16 mounted under the bottom surface of the outer groove 4, or The groove shaft 8 and the wing shaft 10 are connected such that the laundry dewatering tank 6 and the washing rotary disk 9 are integrally unidirectionally rotated. Further, when the groove shaft 8 is separated from the wing shaft 10, the rotation of the groove shaft 8 can be braked by a belt brake mechanism (corresponding to the mechanical brake mechanism in the present invention) 15.

A water injection port portion 17 is provided at an upper rear side of the outer tub 4, and has a lotion container and a soft gel container for washing and storing therein. A water supply port 18 such as a faucet connected to the outside via a hose is provided at the upper rear portion of the outer casing 1, and the water supply pipe 19 connected to the water supply port 18 is connected to the water injection port portion 17 via the water supply valve 20. When the water supply valve 20 is opened, the tap water supplied from the faucet flows into the water injection port portion 17 through the water supply pipe 19, and the water is directed downward from the outer port 4 of the water injection port portion 17 disposed through the cover 4B. Spit out. By preliminarily storing the lotion in a predetermined portion in the lotion container, the lotion can be mixed into the water discharged into the outer tub 4, whereby the lotion can be automatically charged. In the washing machine, the bath water pump 48 is provided as another water supply means to the laundry dewatering tank 6, but the description is omitted here.

A drying unit KS for drying the laundry after the laundry is finished in the laundry dewatering tank 6 in the drying process is provided in the casing adjacent to the water injection port portion 17 or in the water injection port portion 17. The drying unit KS includes a multi-blade air blower FA and an electric heater HT in the casing, and the air between the outer tank 4 and the laundry dewatering tank 6 is sucked from the suction port IN disposed through the cover 4B by the operation of the multi-blade air blower FA. And the warm air heated by the electric heater HT is sent into the laundry dewatering tank 6 through the outlet UT disposed through the through cover 4B, and the warm air flows out between the outer tank 4 and the laundry dewatering tank 6 through the water passing hole 7, and The air circulation of the path taken in from the suction port IN is performed again. The temperature of the warm air heated by the electric heater HT is detected by the thermistor 45, and the main control unit 40, which will be described later, controls the electric heater HT such that the warm air temperature in the drying process becomes a predetermined temperature. power ups.

A drain port 21 is provided at the bottom of the outer tank 4, and a pipe connected to the drain pipe 22 of the drain port 21 is opened and closed by a drain valve 23. The opening and closing operation of the drain valve 23 is interlocked with the operation of the clutch mechanism 13 (that is, the operation of the torque motor 16), and the laundry rotary disk 9 is separated from the washing and dewatering tank 6 to be separately rotatable (the laundry dewatering tank 6 is used by The belt brake mechanism 15 closes the rotation valve 23, and the drain valve 23 is closed, and the drain valve 23 is opened in a state where the washing rotary disk 9 and the laundry dewatering tank 6 are integrally rotatable.

A circulation water passage 26 having an opening at the upper and lower ends is formed on the inner wall surface of the laundry dewatering tank 6, and a water outlet 27 is provided on the bottom wall surface of the laundry dewatering tank 6 below the washing rotary disk 9. When the washing rotary disk 9 is rotationally driven while the appropriate amount of water is stored in the outer tub 4, the bottom of the washing and dewatering tank 6 is made to be externally driven by the pumping action of the blades provided inside the inner surface of the washing rotary disk 9. The water between the bottom walls of the tank 4 is sucked into the washing and dewatering tank 6 through the water outlet 27, and is sent to the lower end opening of the circulating water passage 26. This water rises in the circulating water passage 26, and is discharged into the washing and dewatering tank 6 via the dander filter 28 provided at the upper portion thereof. In order to capture the dander and debris floating in the water.

Further, a gap between the outer tank 4 and the outer casing 1 is provided with a vibration detecting lever (corresponding to the vibration detecting means in the present invention) 29 connected to a vibration detecting switch 47 to be described later, when the outer tank 4 is abnormally The swing can be mechanically detected when the swing is large. Further, although not shown, an air trap is formed at the bottom of the outer tub 4, and the other end of the air hose connected to the air trap is connected to a water level sensor 46 to be described later. Thereby, the water level of the water stored in the laundry dewatering tank 6 can be detected. Further, an operation panel 30 is provided on the front side of the upper surface of the outer casing 1, and a circuit unit 31 including an electric board on which various electric components are mounted is disposed below the operation panel 30.

The configuration of the drive mechanism 11 will be described in more detail with reference to Fig. 2 . The metal motor mount 50 mounted on the bottom of the outer tank 4 is integrally provided with an upper upper bearing housing 51, and below the upper bearing housing 51, the upper upper bearing housing 52 is fixed to the motor mount 50. on. An upper bearing 53 and an oil seal 54 are provided in an upper portion of the upper bearing housing 51, and the groove shaft 8 is rotatably supported without being leaked. A gear case including an upper gear case 55 and a lower gear case 56 is fixed to the outer side of the lower end of the groove shaft 8, and a gear mechanism 57 having the function of the above-described speed reduction mechanism is housed inside the gear case. The gear mechanism 57 is a driving force that is transmitted by the drive shaft 58 that transmits the rotor 122 to which the motor 12 is fixed at the lower end, and is decelerated at a predetermined reduction ratio and transmitted to the wing shaft 10. A lower bearing 59 is provided at a lower portion of the lower bearing housing 52, and the gear case is rotatably supported by the bearing. That is, the groove shaft 8, the upper gear case 55, and the lower gear case 56 are integrally rotatably supported by the upper bearing 53 and the lower bearing 59.

The motor 12 is a so-called outer rotor type motor, and is composed of a stator 121, a rotor 122 disposed on the outer peripheral side so as to surround the stator 121, and a lower portion of the lower bearing housing 52, and holding the stator 121 and including the clutch mechanism 13 The stator mount 123 is constructed. The rotor 122 to which the drive shaft 58 is fixed has a bottomed flat cylindrical shape, and a plurality of magnets 124 are disposed in the rotation direction in the inner side of the peripheral wall thereof so as to face the stator 121. Further, at a plurality of places on the inner side of the top surface of the stator mount 123 (only one place is shown in FIG. 2), a Hall element that detects the magnetic force of the magnet 124 of the rotor 122 to detect the rotational position of the rotor 122 is attached. 125.

The clutch mechanism 13 is disposed at a lower end portion of the drive shaft 58 and includes a clutch gear 60 whose outer diameter is almost the same as the outer diameter of the lower end portion of the lower gear case 56; the lower end portion of the clutch gear 60 to the lower gear case 56 is wound around a clutch spring 61 having an outer circumference; a ratchet wheel 62 disposed around the clutch spring 61 and engaging an end portion of the lower side of the clutch spring 61; and a clutch portion 63 provided at the front end with the pawl portion 63 engaged/disengaged from the ratchet 62 Rod 64. The clutch lever 64 is rotatably supported around the clutch shaft 65 that extends vertically, and is biased by the coil spring 66 in the direction in which the pawl portion 63 is engaged with the ratchet 62.

The belt brake mechanism 15 includes a brake belt 67 wound around an outer peripheral surface of the gear case 55 as a brake drum surface, and a brake lever 68 for tensioning or loosening the brake belt 67. The brake lever 68 is rotatably supported by the clutch shaft 65 at the position above the clutch lever 64 in the same manner as the clutch lever 64. The brake lever 68 and the clutch lever 64 are connected to the torque motor 16 by a connecting member or a cable (not shown), and are operated in conjunction with the torque motor 16.

The pawl portion 63 of the clutch lever 64 is engaged with the ratchet 62 in a state where the torque motor 16 as the drive source is not energized. Therefore, the lower end side of the clutch spring 61 is displaced in the expansion direction, and the clutch gear 60 and the lower end portion of the lower gear case 56 are not joined. Therefore, the rotational driving force of the motor 12 is not transmitted to the groove shaft 8, and is transmitted only to the wing shaft 10. Further, at this time, the brake belt 67 is tensioned by the brake lever 68, and the upper gear case 55, that is, the laundry dewatering tank 6, is fixed by the braking force of the belt brake mechanism 15.

In the above state, since the rotational driving force of the motor 12 is transmitted from the drive shaft 58 to the wing shaft 10 via the gear mechanism 57, that is, the speed reduction mechanism 14, the laundry dewatering tank 6 does not rotate, and only the laundry rotary disk 9 is driven by the motor. The rotational speed of 12 is rotationally driven in the same direction by the deceleration of the predetermined reduction ratio. This rotary drive can be applied to a washing operation or a washing operation in which water is stored in the laundry dewatering tank 6.

When the torsion motor 16 is energized, the torque motor 16 operates and winds a cable (not shown), thereby rotating the clutch lever 64 in a direction resisting the biasing direction of the coil spring 66, thereby causing the pawl portion 63 to The ratchet 62 is disengaged. Thereby, the displacement of the clutch spring 61 is released, and the clutch gear 60 is coupled to the lower end portion of the lower gear case 56 by the fastening of the clutch spring 61. Therefore, the rotational driving force of the motor 12 is directly transmitted to the state of both the groove shaft 8 and the wing shaft 10. Further, when the clutch lever 64 is rotated, the brake lever 68 is also rotated by a connecting member (not shown) to loosen the brake belt 67. Thereby, the braking force of the belt brake mechanism 15 is released, and the fixing of the washing and dewatering tank 6 is released, and the state is freely rotatable.

In the above state, the rotational driving force of the motor 12 is transmitted from the drive shaft 58 to the lower gear case 56, the upper gear case 55, and the slot shaft 8, and is also directly transmitted from the upper gear case 55 to the wing shaft 10 via the gear mechanism 57, Therefore, the laundry dewatering tank 6 is rotationally driven integrally with the washing rotary disk 9 at the same rotational speed and rotational direction as the motor 12. This rotary drive can be used in a dehydration program or the like.

Next, the configuration of the electric system of the washing machine of the present embodiment will be described with reference to Fig. 3. Fig. 3 is a view showing the configuration of an electric control circuit of the washing machine SW of the present invention.

A main control unit including a CPU, a RAM, a ROM, a timer, and the like is provided at the center of the control (in the present invention, the unbalance detecting means, the operation control means, the load amount estimating means, each determining means, and the calculating means) 40. In the main control unit 40, a key signal is input from the operation unit 43 including a plurality of operation keys such as a stroke selection key and a start key, and a temperature signal of the warm air heated by the electric heater HT is input from the thermal resistor 45, A water level detecting signal having a water level corresponding to the water stored in the inside of the outer tank 4 is input from the water level sensor 46, and a vibration detecting is performed from the vibration detecting switch 47 when a large swing of the outer tank 4 is detected. Test signal. The main control unit 40 controls the opening and closing operation of the water supply valve 20, the operation of the bath water pump 48, and the operation of the torque motor 16 via the load driving unit 41. As described above, the torque motor 16 can achieve the connection/disengagement operation of the clutch mechanism 13, the braking/release of the laundry dewatering tank 6 by the belt brake mechanism 15, and the opening and closing operation of the drain valve 23. In addition, the main control unit 40 displays the reception state of the key input of the operation unit 43 and the progress status of the laundry on the display unit 44, and can be used as a buzzer for alerting the user since use. The abnormal notification means in the middle) 49 sounds.

Further, an inverter circuit 70 for driving the motor 12 is provided. The inverter circuit 70 includes an AC-DC conversion circuit 71 that converts AC power into DC power, and includes a plurality of switching elements A that periodically open and close the DC current and supply the three-phase AC current to the motor 12 to a switching circuit 72 of F; and a driving unit (drive circuit) 73 that electrically drives a PWM signal to be described later and supplies it to each of the switching elements A to F, and further includes: communicating with the main control unit 40 and outputting a motor control unit (corresponding to the drive control means in the present invention) 74 of the PWM signal of each of the switching elements A to F of the switch circuit 72; and a pulse containing the Hall element 125 and generating a synchronization with the rotation of the motor 12 A rotation detecting circuit (corresponding to the speed detecting means in the present invention) 75 of the signal. The inverter circuit 70, the motor control unit 74 corresponding to the drive control means, and the rotation detecting circuit corresponding to the speed detecting means constitute a rotary driving means for rotating the washing and dewatering tank 6 from the low speed to the high speed by the motor 12. .

The motor control unit 74 as the drive control means determines the supply to the reverse based on the rotational speed detected by the rotation detecting circuit 75 as the speed detecting means and the motor current detected by the current detecting circuit 77. The duty ratio of the PWM signal of the phaser circuit 70. The duty ratio of the PWM signal is the ratio of the time (signal level "H") time of each pulse of the PWM signal to the on/off cycle, and the driving ratio given to the motor 12 is controlled by adjusting the duty ratio. electric power. Therefore, if the work ratio is increased (i.e., close to 100%), the torque of the motor 12 is increased, and if the duty ratio is lowered (i.e., close to 0%), the torque of the motor 12 is reduced. The AC/DC conversion circuit 71 is composed of a rectifier circuit AD that performs DC conversion of the commercial AC power supply AC by full-wave rectification, and capacitors C1 and C2 that smooth the converted DC. When the commercial AC power source AC is 100 volts, a DC voltage of approximately 280 volts is applied to the lines L1, L2 as the power source voltage of the switch circuit 72.

4 is a plan view showing the operation panel 30. The operation panel 30 is provided with a power button 301, a start and stop button 302, a stroke selection button 303 for the laundry stroke, a manual stroke setting button 304, a water amount setting button 305, and a bath. The water use setting key 306, the reservation setting key 307, and the like are used as operation keys of the operation unit 43. Further, a travel display group 308 composed of 12 LEDs showing the contents of the laundry stroke selected by the stroke selection key 303 and an operation time of each stroke set by the manual stroke setting key 304 are displayed. The setting content display group 309 composed of four LEDs, the water amount display group 310 including five LEDs which displays the amount of water selected by the water amount setting key 305, and the remaining time for displaying the operation and the reservation setting key A numerical value display 311 or the like of the reservation time set by 307 or the like.

When the user presses the power button 301 in the power-off state, all the displays (LEDs) on the operation panel 30 are sequentially illuminated in such a manner as to move rightward from the left end (ie, the water amount display group 310). Since all the displays are turned on once, the user can recognize the situation if the display is not lit due to a display failure or disconnection. In particular, when there is a display for notifying the abnormal state, if the display cannot be turned on due to a failure, the abnormal state cannot be notified, but it is confirmed by the lighting when the power is turned on, whether or not there is a failure. In addition, after all the displays are turned on once, only the display that is initially determined in advance is turned on.

At the beginning of the washing program (washing procedure and washing procedure), the drain valve 23 is closed, and the water supply valve 20 is opened as described above, and tap water is supplied from the faucet to the washing and dewatering tank 6, so that a certain amount of water is stored in the outer tank 4 and the laundry. Inside the dewatering tank 6. During the washing operation, the washing and dewatering tank 6 does not rotate, and only the washing and rotating disc 9 is rotated forward and backward by the motor 12, thereby opening the drain valve after washing the clothes and the like in the clothes washing tank 6 for a predetermined time. 33. The water in the outer tank 4 and the laundry dewatering tank 6 is discharged from the drain pipe 22. After the draining, the washing and dewatering tank 6 and the washing and whistling disk 9 are simultaneously rotated by the motor 12 for a predetermined time, and the dehydrating operation (dehydration process) for dehydrating the laundry is entered. After this dehydration operation, the washing operation is performed. In the washing operation, the drain valve 33 is closed again, and a certain amount of water is stored in the washing tub 3 by the same water supply as described above, and the washing and dewatering tank 6 is not rotated by the motor 12, and only the washing rotary disc is provided. 9 is rotated forward and backward, and after washing the laundry for a predetermined time, the drain valve 33 is opened, the washing water of the washing and dewatering tank 6 is discharged from the drain pipe 22, and then the clutch mechanism 13 is actuated by the motor 12 The laundry dewatering tank 6 is rotated simultaneously with the laundry rotary tray 9 to perform the dehydration operation of the laundry. This washing operation and dehydration operation (dehydration process) are usually performed plural times. The drying unit KS is provided to perform a drying function (drying process) after performing the washing operation and the dehydration operation in this order. When the water level of the water supplied to the laundry dewatering tank 6 is higher than the predetermined water level by the above-described water supply, it is configured to be discharged from the overflow port to the drain pipe 22.

Next, the control operation of the dehydration program which is one of the features of the washing machine SW of the present embodiment will be described in accordance with Figs. 5 to 14 . The washing machine SW enters the dehydration process after ending the washing or washing process in the washing and dewatering tank 6. In the spin-drying process, the rotation speed of the motor 12 is controlled to rise at the set high-speed spin-drying speed. Fig. 5 is a view showing the sequence of vibration detection in the dehydration process of the washing machine of the present invention. In FIG. 5 and other figures, the first detection performed by the first detecting means according to the present invention is marked as detection 1, and the second detection performed according to the second detecting means is marked as detection 2 The third detection performed according to the third detection means is marked as detection 3.

At the start of the dehydration process, it is assumed that the drain valve 23 is opened to discharge the water in the outer tank 4 to the outside of the machine. When the spin-drying process is started in this state, first, the main control unit 40 turns on the torque motor 16 and switches the clutch mechanism 13, so that the washing and dewatering tank 6 and the washing and rotating disk 9 are integrally rotatable, and then the motor 12 is energized. The motor 12 is started. In other words, the main control unit 40 sets the PWM operation ratio instructed to the inverter circuit 70 to an initial value so that the laundry dewatering tank 6 in the stopped state and the washing rotary disk 9 are integrally driven to rotate, for example, 18/. 255. Thereby, the drive current corresponding to the PWM operation is supplied to the motor 12.

Thereby, the laundry dewatering tank 6 and the washing rotary disk 9 are integrally rotated (step S1 of FIG. 6), and the main control unit 40 monitors the output of the rotor 122 accompanying the rotation of the rotor 12 by the Hall element 125. Rotating the pulse signal, and determining whether to obtain the rotation pulse signal in the motor lock determination step, when the rotation pulse signal is not obtained, that is, in the state that the motor 12 is locked, the PWM operation ratio is increased by, for example, only 4/255. . This increase is determined based on the rotational speed derived from the rotational pulse signal obtained by the Hall element 125 and the motor current value derived from the voltage signal obtained by the current detecting circuit 77. Then, it stands by in this state until 0.15 seconds elapses, and for example, a PWM operation ratio of 4/255 is added every 0.15 seconds until the laundry dewatering tank 6 starts to rotate, thereby gradually increasing the torque of the motor 12. This operation is repeated. When the motor 12 is energized and a predetermined time (for example, 2 seconds) elapses, when the rotation pulse signal is not obtained in the motor lock determination step, the motor 12 is judged to be locked, and the main control unit 40 sets the motor 12 Control is stopped.

On the other hand, when the rotation pulse signal is obtained in the motor lock determination step, that is, when it is determined that the motor 12 is not locked, the main control unit 40 determines whether the rotation speed of the motor 12 has reached 120 rpm which is set to a predetermined low speed lower target rotation speed. If it does not reach 120 rpm, the PWM operation ratio is only increased by 1/255. Then, it stands by in this state until 0.3 seconds elapses, and it is determined again whether the rotation speed of the motor 12 reaches 120 rpm, and the flow is repeated. Therefore, from the start of rotation of the motor 12 until the rotational speed reaches 120 rpm, a PWM operating ratio of 1/255 is added every 0.3 seconds, thereby gradually increasing the torque of the motor 12, as shown by the straight line of Fig. 5, at a full acceleration (implementation In the example, 60 rpm/s) is accelerated at a small acceleration of 30 rpm/s. Then, when the number of revolutions of the motor 12 reaches 120 rpm, the main control unit 40 performs control for setting the value of the PWM duty ratio to be constant, and maintains the motor 12 at the low speed lower target rotation speed of 120 rpm (step S2 of Fig. 6). The low speed lower target speed is a resonance point of the washing machine SW (usually about 200 to 250 rpm in the fully automatic washing machine in which the washing and dewatering tank 6 rotates in the bottomed cylindrical outer tank 4, which is set in this embodiment as 200 rpm) is a low rotation speed, which is set to 120 rpm in this embodiment.

As described above, the lateral swing generated at the initial stage of the dehydration operation is such that the outer groove 4 is brought into contact with the vibration detecting lever 29 by the vibration, and the vibration detecting switch 47 is operated, whereby the main control unit 40 stops the motor 12. The mechanical detection method of the rotation control. The imbalance determination based on the mechanical detection method is a state that is performed during the entire dehydration operation.

When the abnormal vibration is not detected by the mechanical detection method, the rotation speed of the motor 12 is further increased, and then, for the longitudinal oscillation generated, the change of the rotation speed of the motor 12 in the low speed state of the motor 12 is detected. In the case of abnormal vibration, the longitudinal swing precursor detection is performed by stopping the motor (this is referred to as the first detection), and the change of the duty ratio of the PWM signal of the control of the motor 12 in the low-speed rotation state of the motor is detected. When an abnormal vibration occurs, the longitudinal swing precursor detection (this is called the second detection) is performed by stopping the motor to know the abnormal vibration caused by the longitudinal swing in the dehydration program. When the longitudinal swing is generated at the low-speed rotation, the first detection and the second detection are aliased because the suspension rod 5A of the hanging support outer groove 4 and the coil spring of the shock-absorbing mechanism 5B including the coil spring are in a closed state. It can also be called low speed bottom detection 1 and low speed bottom detection 2.

In the present invention, it is determined that the imbalance detection is performed by the mechanical detection method until the target reaches 120 rpm, and then the first detection is performed in order to reach the target high-speed dehydration rotation speed (800 rpm in the embodiment). Measurement (1st detection operation), 2nd detection (2nd detection operation), and 3rd detection (3rd detection operation).

The main control unit 40 performs various operations by the CPU (central arithmetic unit) included in the main control unit 40 in accordance with the operation program stored in the ROM (memory) of the main control unit 40. The first detection (first detection operation), the second detection (second detection operation), and the third detection (third detection operation) described in the description are performed as means for each means of the present invention. .

(The operation of the first detecting means, hereinafter referred to as the first detecting action)

The first detecting operation is started from a steady state in which the motor 12 is maintained at a predetermined low speed lower target rotational speed of 120 rpm. The first detecting operation is a low speed region which is sufficiently lower than the target high-speed dehydration rotation speed (800 rpm in the embodiment), and the low-speed lower-speed rotation at the resonance point of the washing machine SW (200 rpm in the embodiment) (implementation In the first constant acceleration zone, which is 120 rpm) and starts to a predetermined low-speed upper intermediate target rotational speed (240 rpm in the embodiment), it is calculated that the rotational speed of the motor 12 is increased to a predetermined low-speed upper target rotational speed of 240 rpm. The first difference calculation means of the deviation between the command value and the actual rise speed value; and determining the laundry dewatering tank 6 by comparing the deviation value of the first difference calculation means with a predetermined threshold value The first detection means of the first imbalance determination means with or without imbalance.

Further, the configuration of the first detecting means may be a value generated by a difference in the number of revolutions every predetermined time when the number of revolutions of the motor 12 is increased to the low speed upper target rotational speed (240 rpm in the embodiment), and predetermined The threshold values are compared to determine the presence or absence of imbalance in the laundry dewatering tank 6. This configuration will be specifically described below.

Specifically, the rotational speed of the motor 12 is accelerated from the low-speed lower-lower rotational speed 120 rpm to the predetermined low-speed upper target rotational speed 240 rpm, so that the rotational speed is substantially constant as time elapses (step S3 of FIG. 6). ). This constant acceleration is a state in which the motor 12 is accelerated by the inverter circuit 70 at a full acceleration (60 rpm/s in the embodiment). Between the low speed lower low speed 120 rpm and the low speed upper target speed 240 rpm, the water of the laundry is dehydrated, but in general laundry such as underwear, due to the low rotation speed rather than the rapid dehydration state, the There is a possibility that the drain port 21 at the bottom of the outer tank 4 cannot be completely drained, and a large amount of water is stored in the bottom of the outer tank 4 to become a resistance to the rotation of the washing and dewatering tank 6, so that the laundry dewatering tank 6 can be unevenly distributed. The judgment became good.

When the constant acceleration from the low speed lower rotation speed 120 rpm to the low speed upper target rotation speed 240 rpm is started (step S3 in Fig. 6), the first detection operation is started. This first detection operation is performed by the flow shown in FIG. In other words, in step S3, a certain acceleration from the low-speed lower rotational speed 120 rpm to the low-speed upper target rotational speed 240 rpm is started (step S3 in Fig. 7), the timer is started (step S31 in Fig. 7), and the counter is started (Fig. 7). In step S32), it is determined whether or not a predetermined time (here, 0.3 second) has elapsed (step S33 of Fig. 7), and when 0.3 seconds has elapsed, the counter is initialized (step S34 of Fig. 7). In step S35 of the seventh drawing, the predetermined number of rotations of the motors 12, V1, V2, V3, and V4, ‧ ‧ is predetermined, but the number of revolutions of the motor 12 has not been detected. The rotational speed of the motor 12 is monitored by the Hall element 125, and the rotational speed of the motor 12 is detected by the rotation detecting circuit 75 every predetermined time (here, 0.3 seconds). V1, V2, V3, V4‧ ‧‧

Then, in step S36 of Fig. 7, it is determined whether or not a predetermined time (here, 3.6 seconds) has elapsed since the start of the timer, and when it has not passed 3.6 seconds, the process proceeds to step S37 of Fig. 7, and the rotation speed of the motor 12 is determined. Whether it is at 170rpm to 205rpm. During this period, the rotational speeds V1, V2, V3, V4‧‧‧‧ of the motor 12 are obtained every 0.3 seconds, and in step S35 of Fig. 7, the difference between the adjacent rotational speeds, that is, V2- V1=S1, V3-V2=S2, V4-V3=S3, V5-V4=S4‧‧‧. This is the first difference calculation means for calculating the rising value of the actual rotational speed of the motor 12. In the first difference calculation means, a plurality of accumulated values calculated from the latest value among the differences of the rotational speeds are calculated, that is, in the embodiment, W1 = S1 + S2 + S3, W2 is calculated as three cumulative values. =S2+S3+S4, W3=S3+S4+S5, W4=S4+S5+S6‧‧‧. In this case, by accumulating the difference in the number of revolutions, it is possible to reduce the error of the difference in the measured number of revolutions or the error caused by the operation program of the main control unit 40.

When the rotation speed of the motor 12 is not 170 rpm to 205 rpm, it returns to step S32 of FIG. 7, and when the rotation speed of the motor 12 is 170 rpm to 205 rpm, it moves to step S38 of FIG. 7, and W1, W2, W3, W4‧‧ The values of ‧ are compared to a predetermined threshold (here set to 17). When the offset of the laundry in the washing and dewatering tank is large and the eccentric load is increased, the smooth acceleration of the motor 12 cannot be obtained, so the difference between the adjacent rotational speeds S1, S2, S3, and S4 is smaller than that of the eccentric load. S5‧‧‧ is smaller, as shown by the dotted line in Fig. 8, the increase in the rotational speed is slowed down. Therefore, W1, W2, W3, W4‧‧‧ are also smaller, and in comparison with the threshold, when any of W1, W2, W3, W4‧‧‧ is below the threshold or When the threshold value is not reached, the abnormal vibration in the longitudinal swing of the spin-drying program is detected, so that the main control portion 40 immediately stops the motor 12, and the brake is applied to stop the rotation of the washing and dewatering tank 6 (step S39 of Fig. 7). ). This is the first imbalance determining means for determining the presence or absence of the imbalance of the washing and dewatering tank 6 by comparing the rising change in the number of revolutions calculated by the first difference calculating means with the predetermined threshold value.

In this way, when abnormality detection is performed to stop the motor 12, in order to correct the unbalanced state of the laundry in the laundry dewatering tank 6, the predetermined water injection of the laundry dewatering tank 6 is automatically performed by the operation of the main control unit 40. After that, an unbalanced washing procedure for automatically eliminating the imbalance is performed. The unbalanced washing program is one of starting a normal plurality of washing programs or one washing program in accordance with the program setting of the main control unit 40. After the completion of the washing process, the water can be automatically drained and the operation of the motor 12 in the stopped state is restarted, and the dehydration process is started from the beginning, and the same detection operation as described above is performed.

On the other hand, when any one of W1, W2, W3, W4‧‧‧ is above or above the threshold, the eccentric load is small, as shown by the solid line in Fig. 8. As shown, the increase in the rotational speed is in a state of linear acceleration. At this time, the process proceeds to step S32 of Fig. 7, and the operation of the first difference calculating means is sequentially performed. In this step, in step S36 of FIG. 7, it is checked constantly whether it has passed 3.6 seconds since the start timer, and if no abnormal vibration is detected between 3.6 seconds, the series is ended after 3.6 seconds have elapsed. The first detection operation (step S40 of Fig. 7) is moved to the second detection flowchart of Fig. 9.

As described above, the first detecting operation, as shown in Fig. 8, is 3.6 times the predetermined time from the start of the timer in the predetermined area lower than the target high-speed dehydration rotational speed (800 rpm in the embodiment). The second is the determination time, which is a period during which the rotation speed of the motor 12 is accelerated from 120 rpm to 240 rpm. Further, during this period, between 170 rpm and 205 rpm between the resonance point (here, 200 rpm) of the wrapper washing machine SW, the rotational speeds V1, V2, V3, V4, ‧ ‧ ‧ of the motor 12 are obtained every 0.3 seconds Determine the speed period. As described above, by setting one of the resonance points of the collet washing machine SW in the determination time as the determination speed period, it is possible to determine the abnormal vibration in the stable acceleration region between the acceleration of the rotation of the motor 12 from 120 rpm to 240 rpm. In addition, when the increase in the rotational speed is slow, the difference in the rotational speed or the acceleration every 0.3 seconds is small and cannot be detected with high accuracy. Therefore, the motor 12 is fixed from the low-speed lower rotational speed 120 rpm to the low-speed upper target rotational speed 240 rpm. The acceleration is a state in which the motor 12 is accelerated in the full acceleration state by the inverter circuit 70. In the embodiment, the total acceleration is 60 rpm/s.

In other respects, although the accuracy is lower than that of W1, W2, W3, and W4‧‧‧, it is also possible to configure each of S1, S2, S3, and S4‧‧‧ in step S38 of Fig. 7 The value is compared with a predetermined threshold value, in which any one of S1, S2, S3, S4‧‧‧‧ is below the threshold or fails to reach the threshold The abnormal vibration in the longitudinal swing of the spin-drying program causes the main control unit 40 to immediately operate to stop the motor 12 (step S39 of Fig. 7).

Further, the first difference calculating means may be configured not to calculate a change in the rotational speed but to calculate an acceleration change every predetermined time, and to compare the absolute value change every predetermined time with a predetermined threshold value. To determine if there is abnormal vibration. At this time, when the laundry deviation of the laundry dewatering tank 6 is large and the eccentric load is increased, the smooth acceleration of the motor 12 cannot be obtained, so that the acceleration change every predetermined time becomes larger than when the eccentric load is small. Therefore, in the comparison of the acceleration change and the threshold value at every predetermined time, when the acceleration change is above the threshold value or exceeds the threshold value, the abnormal vibration in the longitudinal swing of the dehydration program is detected, so that the main The control unit 40 immediately operates to stop the motor 12 (step S39 of Fig. 7).

Furthermore, when the laundry deviation of the laundry dewatering tank 6 is large and the eccentric load is increased, the smooth acceleration of the motor 12 cannot be obtained, so that compared with the eccentric load, the PWM is indicated by the inverter circuit 70. The operation is actually controlled by the Hall element 125 and the rotational speed of the motor 12 is detected by the rotation detecting circuit 75 every predetermined time (here, 0.3 seconds). V3, V4‧‧‧‧ slowed down, causing a deviation between the two. Therefore, the first difference calculating means may be configured to increase the command value of the rotational speed of the motor 12, that is, the value determined by the PWM operating ratio of the inverter circuit 70, and actually by the Hall element. 125 monitors and compares the rotational speeds V1, V2, V3, V4‧‧‧‧ of the motor 12 detected by the rotation detecting circuit 75 every predetermined time (here, 0.3 seconds), by means of the comparison, When any one of the deviations is above or above the threshold value, the abnormal vibration in the longitudinal swing of the spin-drying program is detected, so that the main control unit 40 immediately stops the motor 12 (step of FIG. 7) S39).

As described above, the first detecting operation measures the deviation between the command value for raising the rotational speed of the motor 12 and the rising value of the actual rotational speed, and when the deviation exceeds the threshold (step S38 of FIG. 7), the motor is stopped. 12 (step S39 of Fig. 7). With respect to other means of replacing this mode, the acceleration change may be measured in a predetermined low-speed rotation zone with respect to the command value for increasing the rotational speed of the motor 12, and may be stopped when the absolute value of the acceleration is below a predetermined value. The motor 12 stops the motor 12 when the amount of change in the acceleration is equal to or greater than a predetermined value. At this time, the acceleration system is set to the full acceleration state determined by the PWM operation ratio of the inverter circuit 70. This is because when the acceleration is low, the difference between the abnormal vibration state and the normal state is not easy to appear.

Further, the error of the program of the main control portion 40 can be absorbed by using the cumulative value of the rotational speed.

(The operation of the second detecting means is hereinafter referred to as the second detecting operation)

After the first detection operation is completed (step S40 of FIG. 7), the second detection flow chart of FIG. 9 is moved (step S40 of FIG. 9). As described above, in the determination time of 3.6 seconds for performing the first detecting operation, the number of revolutions of the motor 12 is accelerated from 120 rpm to 240 rpm. As indicated by the solid line in Fig. 8, the increase in the number of revolutions is linearly accelerated. status. At this time, the rotation speed of the motor 12 is accelerated from 120 rpm to 240 rpm by the PWM operation ratio indicated to the inverter circuit 70, but at the point of reaching 240 rpm, the PWM operation ratio indicated to the inverter circuit 70 is It becomes larger than the PWM operation ratio for maintaining the constant speed rotation of 240 rpm, and even if the PWM duty ratio is changed, the rotation speed cannot be stabilized at 240 rpm immediately, and as shown in Fig. 8, a number of over shoots are generated. At the start of accelerating the rotation of the motor 12 from 120 rpm to 240 rpm for 3.6 seconds, the reference duty ratio d0 is obtained (step S41 of Fig. 9). The point at which the above-mentioned 3.6-second determination time ends is the point at which the overshoot is about to occur, whereby the abnormality detection with no fluctuation can be performed in the determination time of 3.6 seconds.

In the state where no overshoot occurs, if the target rotation speed is to be stabilized at 240 rpm, the acceleration must be gradually weakened from the state close to the target rotation speed. Thus, when the acceleration is weakened, the abnormality detection within the range is generated. Change (gap). However, in the present invention, by generating an overshoot, even if the acceleration is not attenuated in a state close to the target rotational speed, such a detection variation is not generated and a stable detection result can be obtained.

The reference work ratio d0 is the highest working ratio determined by the low speed upper target speed of 240 rpm and the load amount (the weight of the laundry containing moisture in the washing and dewatering tank 6), and the second detecting action is Benchmark, and in order to maintain a certain rotational speed of the median target speed of 240 rpm, measure how the PWM duty ratio is reduced in time, and by decreasing the measured value to a predetermined reference ratio (time and PWM duty ratio function) For comparison, the motor 12 is stopped when the difference is above or above the predetermined threshold.

The greater the eccentric load is due to the greater the offset of the laundry in the washing and dewatering tank 6, the greater the PWM working ratio for maintaining the rotation speed of the motor 12 at 240 rpm, and the laundry dewatering tank 6 is biased in the laundry. The smaller the eccentric load is, the smaller the eccentric load is, and the smaller the PWM working ratio for maintaining the rotation speed of the motor 12 at 240 rpm, the reason can be used to determine the degree of vibration caused by the eccentric load of the washing and dewatering tank 6. .

However, when the load is low, the inertial force after reaching the low speed upper target speed of 240 rpm is small, and the acceleration does not require high power, so it is not easy to cause longitudinal vibration and the work ratio is reduced to a small extent, so that error detection occurs. Doubt. In order to prevent such error detection, the aforementioned reference duty ratio decreasing function can be changed by the amount of load.

Further, when the inverter circuit 70 is in a normal power supply state, the inverter circuit 70 uses a DC voltage (a DC voltage of approximately 280 volts) charged to the capacitors C1 and C2 of the AC-DC conversion circuit 71 as a normal power source. The voltage operates, but when the commercial AC power supply AC is lower than 100 volts, the power supply voltage is lowered to cause the operating point of the inverter circuit 70 to move, and it becomes impossible to determine based on the correct PWM duty ratio. Further, in response to the load applied to the motor 12 (the laundry in the laundry dewatering tank 6 and the laundry dewatering tank 6, and the resistance of the oil seal portion of the bearing of the motor 12), the capacitor C1 is charged during the acceleration operation of the motor 12. The charge of C2 is consumed, and the DC voltage (a DC voltage of approximately 280 volts) causes a voltage drop, so that the operating point of the inverter circuit 70 is moved, and the determination based on the correct PWM duty ratio cannot be performed. In order to cope with such a situation, the power supply voltage detecting circuit 76 is configured to constantly detect the DC power supply voltage. In step S41 of FIG. 9, the correction is performed to be equivalent to the time point at which the reference duty ratio d0 is obtained. The corrected working ratio of the duty ratio of the DC power supply voltage (approximately 280 volts DC voltage) is used to determine the degree of vibration caused by the eccentric load of the laundry dewatering tank 6. Therefore, the reference duty ratio d0 is a correction reference duty ratio d0 that is corrected in response to the DC power supply voltage at the time when the reference duty ratio d0 is obtained.

Thus, by using the corrected reference duty ratio d0, even if the load applied to the motor 12 (the laundry in the laundry dewatering tank 6 and the laundry dewatering tank 6, and the resistance of the oil seal portion of the bearing of the motor 12) is affected, The reference duty ratio d0 is set to the correction reference duty ratio d0 for correcting the DC power supply voltage at the time when the reference duty ratio d0 is obtained, so that the detection fluctuation is not affected.

When the reference duty ratio d0 is obtained, it is estimated that the power supply voltage does not fluctuate in a short period of time (8.1 seconds to be described later). Therefore, in the short period of time (8.1 seconds described later), it is considered that it is not necessary to correct every predetermined time ( Here is 0.3 seconds) of the work ratio achieved. However, in order to obtain more correctness, the work obtained every predetermined time (here, 0.3 seconds) can be corrected in the same manner.

Hereinafter, the state of moving to the second detection flowchart of FIG. 9 after the end of the first detection operation (step S40 of FIG. 7) is completed (step S40 of FIG. 9). When the rotation of the motor 12 is started from 120 rpm to 240 rpm for 3.6 seconds, the first detection operation is completed (step S40 of FIG. 7), and the reference operation ratio d0 at the time point is obtained (step S41 of FIG. 9). Start the timer (step S42 of Fig. 9), start the counter (step S43 of Fig. 9), and determine whether or not a predetermined time (here, 0.3 second) has elapsed (step S44 of Fig. 9), after 0.3 seconds elapses, The counter is initialized (step S45 of Fig. 9). In step S46 of the subsequent ninth figure, the PWM duty ratio dn indicated by the inverter circuit 70 at that time point is obtained. The PWM operation ratio dn is continuously measured three times to update the PWM duty ratio every 4 ms (4 milliseconds) of the predetermined time interval, and the intermediate value is taken. Thereby an appropriate PWM duty ratio dn can be obtained. In step S47, the difference between the duty ratio dn at the time point and the comparison work ratio X (dn × 100 - 100) is calculated every 0.3 seconds from the time when the timer is started. The comparison work ratio X is calculated as X = d0 × 100) - (23 × 3 × T), and T = t ÷ 0.3. In the embodiment, since the detection start is set to start from T=7, between the time t=8.1 seconds of the timer, the difference between the work ratio dn and the comparison work ratio X is calculated every 0.3 seconds (dn× 100-100). Further, the numerical value of this arithmetic expression is a value determined by the inverter circuit 70 employed in the embodiment, and is a value determined in accordance with each of the inverter circuits 70 in accordance with the design. The comparison work ratio X thus set is a function of the ratio of time to PWM operation, so it can be called the reference duty ratio decreasing function.

Then, in step S48 of Fig. 9, it is determined whether or not a predetermined time (here, 8.1 seconds) has elapsed since the start of the timer (step S42 of Fig. 9), and when the 8.1 second has elapsed, the second detecting operation is ended ( In step S54) of Fig. 9, when 8.1 seconds have not elapsed, the process proceeds to step S49 of Fig. 9, and it is determined whether or not the water level detection data is equal to or less than a certain value.

As described above, although not shown, an air trap is formed at the bottom of the outer tub 4, and the other end of the air hose that is connected to the air trap that extends substantially vertically is connected to the water level sensor 46. Thereby, the water level in the air hose can be increased by the rise of the water level of the water stored in the laundry dewatering tank 6 (the same as the water level in the outer tank 4), so that the water level sensor 46 can be detected. The composition of the air pressure is measured. Therefore, the water level detection data is based on the detected value of the water level sensor 46.

In step S49 of FIG. 9, when the water level detection data exceeds a certain value, the second detection operation is ended (step S54 of FIG. 9), and when the water level detection data is equal to or less than a certain value, the fifth image is entered. In step S50, it is determined whether or not the corrected reference operation ratio d0 for correcting the reference duty ratio d0 is equal to or greater than a certain value. When moving from step S48 of Fig. 9 to step S49 of Fig. 9, if the water level detection data is not measured, step S49 of Fig. 9 is skipped and the process proceeds to step S50 of Fig. 9. When the corrected reference operation ratio d0 does not reach a certain value in step S50 of the ninth diagram, the second detection operation is ended (step S54 of FIG. 9), and if the corrected reference operation ratio d0 is equal to or greater than a certain value, the process proceeds to In step S51 of Fig. 9, it is determined whether T is 7 or more. When T has not reached 7, it returns to step S43 of Fig. 9, and the above-described steps are sequentially performed. Here, if T is 7 or more, the process proceeds to step S52 of Fig. 9 to perform the calculation of the dn × 100 - X threshold C. The threshold value is C=32×T. When the calculation is completed, the process proceeds to step S52 of Fig. 9, and the motor 12 is stopped. If the calculation is not satisfied, the process returns to step S43 of Fig. 9, and the above-described step operations are sequentially performed.

In this manner, the second detecting operation is performed only when the water level detecting data is equal to or smaller than a predetermined value and the corrected reference operating ratio d0 is corrected to be equal to or greater than the fixed value d0. As can be seen from the above operation, the determination time of the second detection operation is 8.1 seconds as shown in FIG.

As described above, the change of the PWM operation ratio in the second detecting operation with respect to the passage of time, as shown in FIG. 10, is that when the offset of the laundry in the laundry dewatering tank 6 is larger, the eccentric load is increased. The greater the PWM duty ratio for maintaining the rotational speed of the motor 12 at 240 rpm, the smaller the bias in the laundry of the laundry dewatering tank 6 and the smaller the eccentric load, for maintaining the rotational speed of the motor 12 at 240 rpm. The smaller the PWM duty ratio is, the more the degree of vibration caused by the eccentric load of the laundry dewatering tank 6 can be determined by the comparison operation with the threshold value C in step S52 of Fig. 9 as the threshold value C. Larger and stop the motor 12.

In this way, when abnormality detection is performed to stop the motor 12, in order to correct the unbalanced state of the laundry in the laundry dewatering tank 6, the predetermined water injection of the laundry dewatering tank 6 is automatically performed by the operation of the main control unit 40. After that, an unbalanced washing procedure for automatically eliminating the imbalance is performed. The unbalanced washing program starts any one of the general plurality of washing programs or the one-time washing program in accordance with the program setting of the main control unit 40. After the completion of the washing process, the water can be automatically drained and the operation of the motor 12 in the stopped state is restarted, and the dehydration process is started from the beginning, and the same detection operation as described above is performed.

As described above, in the second detecting operation, in step S48 of Fig. 9, it is determined whether or not a predetermined time (here, 8.1 seconds) has elapsed since the timer was started (step S42 in Fig. 9), and if 8.1 has elapsed. In the second, the second detecting operation is ended (step S54 in FIG. 9). If 8.1 seconds have not elapsed, step S49 in FIG. 9 is performed, and the operation proceeds to step S52 in sequence, but in the step of FIG. In S48, it is also possible to move to step S53 and stop the motor 12 by not having passed the determination of 8.1 seconds. When the steps S49 to S52 are omitted in this manner, the determination of the amount of load in the laundry dewatering tank 6 is not considered, and the determination of the state in which the voltage of the commercial alternating current power source AC is changed is not considered. On the other hand, as described above, by setting steps S48 to S52, the amount of load in the laundry dewatering tank 6 can be measured by the water level detection data, and determination is made based thereon, and even in the commercial AC power source AC When the voltage is changed, the determination is made by correcting the value so that the determination is made, and the determination of the imbalance of the washing and dewatering tank 6 is good.

When the laundry in the laundry dewatering tank 6 is a laundry having a large amount of water absorption like a felt, when the abnormality detection is performed to stop the motor 12, it is not performed until a predetermined number of times (three times in the embodiment). The equalization washing process is automatically restarted immediately (also referred to as restarting), whereby the abnormality detection due to the rotational resistance of the washing and dewatering tank 6 caused by the excessive amount of dehydrated water can be determined. .

Therefore, when it is determined that the degree of vibration caused by the eccentric load of the laundry dewatering tank 6 is large (abnormal detection) during the first detecting operation, the motor 12 is stopped (step S39 of FIG. 7), or at the second In the detection operation, it is determined that the degree of vibration caused by the eccentric load of the laundry dewatering tank 6 is large, and when the motor 12 is stopped (step S53 of FIG. 9), as shown in FIG. 6, in the next step S55, it is determined whether or not Blanket trip. In a laundry having a small amount of water absorption such as underwear, the water removed by the execution of the first detecting operation or the second detecting operation can be sufficiently drained from the drain port 21 at the bottom of the outer tub 4, so that it does not There is a concern that it is stored in the bottom of the outer tank 4 and becomes a resistance to the rotation of the washing and dewatering tank 6. However, when the laundry in the laundry dewatering tank 6 is a laundry having a large amount of water absorption like a blanket, the water in the felt is also dehydrated by the execution of the first detecting operation or the second detecting operation, and the amount of water is large. At this time, it is impossible to completely drain the drain port 21 at the bottom of the outer tank 4, and a large amount of water is stored in the bottom of the outer tank 4, which becomes a resistance to the rotation of the washing and dewatering tank 6. Therefore, in the first detecting operation or the second detecting operation, the motor 12 is in a stopped state, and it is not determined whether or not the water stored in the bottom portion of the outer tub 4 is affected. Therefore, this determination is made in step S55 of Fig. 6 . .

Step S55 of Fig. 6 is a step of determining whether the laundry in the laundry dewatering tank 6 is a laundry having a large amount of water absorption, such as a blanket, and showing the felt stroke, but is not limited thereto. this. In the embodiment, it is determined whether or not it is a felt stroke in step S55. The felt stroke is a stroke selection button 303 for selecting a laundry stroke of one of the operation portions 43 of the operation panel 30, and the felt is selected and information for selecting the felt is input to the main control portion 40.

In step S55 of Fig. 6, it is determined whether or not it is a felt stroke. Here, if it is determined that the felt stroke is not selected, the unbalance correction of step S56 of Fig. 6 is moved, and the unbalanced state of the laundry of the laundry dewatering tank 6 is automatically corrected. On the other hand, if it is determined in step S55 that the felt stroke is selected, the process proceeds to step S57 of Fig. 6, and it is judged whether or not the stop of the motor 12 has continuously reached a predetermined number of times or more (three times or more in the embodiment). When it is determined that the number of times is not more than the predetermined number of times (three times or more in the embodiment), the process proceeds to the restarting step of step S58 of FIG. 6, so that the motor 12 in the stopped state is not caused by the operation of the main control unit 40. The equalization washing program is automatically restarted immediately (also referred to as restarting), and the first detecting operation and the second detecting operation are restarted in sequence as described above. On the other hand, if it is determined in step S57 that the stop of the motor 12 has continuously reached a predetermined number of times or more (three times or more in the embodiment), in order to automatically correct the unbalanced state of the laundry of the laundry dewatering tank 6, it is moved to Step S59 of Fig. 6 of the step of unbalance correction. The above-described imbalance correction is performed by automatically discharging the laundry dewatering tank 6 by the operation of the main control unit 40, and then performing an unbalanced washing program for automatically eliminating the imbalance. The unbalanced washing program starts any one of the general plurality of washing programs or the one-time washing program in accordance with the program setting of the main control unit 40. After the completion of the washing process, the water can be automatically drained and the operation of the motor 12 in the stopped state is restarted, and the dehydration process is started from the beginning, and the same detection operation as described above is performed.

In this way, by providing a step of determining whether the laundry in the laundry dewatering tank 6 is a laundry having a large amount of water absorption like a blanket, it is possible to determine that the motor 12 is stopped in the first detecting operation or the second detecting operation. The reason is whether the water removed from the blanket-like laundry cannot be completely discharged from the drain port 21 at the bottom of the outer tank 4, and is stored in the bottom of the outer tank 4 to become an abnormal vibration detection caused by the rotational resistance of the laundry dewatering tank 6. The state can improve the judgment system. The stop of the motor 12 is a stop control of the motor 12 by the main control unit 40, and a brake is applied to stop the rotation of the washing and dewatering tank 6.

In this manner, when the abnormality detection of the state in which the motor 12 is stopped is continuously performed, the laundry dewatering tank 6 is automatically scheduled by the action of the main control unit 40 in order to correct the unbalanced state of the laundry in the laundry dewatering tank 6. After the water injection, an unbalanced washing procedure is performed to automatically eliminate the imbalance. The unbalanced washing program starts any one of the general plurality of washing programs or the one-time washing program in accordance with the program setting of the main control unit 40. After the completion of the washing process, the draining is automatically performed, and the operation of the motor 12 in the stopped state is restarted, the spin-drying process is started from the beginning, and the same detecting operation as described above is performed.

In this way, the first detection operation is suitable for immediately detecting an abnormality using the difference in rotational speed. In addition, the second detection operation is suitable for those who use the PWM operation ratio to immediately perform an abnormality detection. Furthermore, the first detection operation and the second detection operation are suitable for determining whether the laundry in the laundry dewatering tank 6 is a laundry that absorbs a large amount of water like a blanket.

Further, in the case of the felt stroke, when the abnormality detection is formed, the motor 12 is automatically stopped immediately, the unbalanced washing process is not performed, and the restarting is performed, that is, the dehydration process is performed again. Further, when the abnormality detection is performed continuously for a predetermined number of times (three times in the embodiment), in order to automatically perform the imbalance correction, the laundry dewatering tank 6 is filled with water and subjected to uneven washing, and then dehydrated again. program. Therefore, in the initial abnormality detection between the general dehydration processes, by performing the re-starting, that is, performing the dehydration process again, it can be confirmed again that the eccentricity of the laundry of the laundry dewatering tank 6 is caused by The removal of a large amount of water from the blanket-like laundry is caused by the resistance of the rotation of the laundry dewatering tank 6. When the abnormality detection is again formed, it is determined that the eccentricity of the laundry of the laundry dewatering tank 6 is caused by the water in the washing and dewatering tank 6 and the washing is performed to eliminate the imbalance (the eccentricity of the laundry). A dehydration procedure is performed whereby the desired dehydration can be achieved.

In addition, in order to perform the first detection operation or the second detection operation of the low-speed detection, it is carefully designed to perform the acceleration at a low speed in the full acceleration state, so that a gap can be formed at the time of the vibration detection to improve the detection accuracy.

Further, in the second detecting operation, as described above, the highest duty ratio determined by the low-speed upper target rotational speed 240 rpm and the load amount of the washing and dewatering tank 6 is measured, and this is set as the reference working ratio, in order to maintain the low speed. The upper target speed is 240 rpm, and the working ratio is measured to be reduced, and compared with the comparison work ratio decreasing function, that is, the reference work ratio decreasing function (function of time to work ratio) (step S47 of Fig. 9), if the difference If it is equal to or greater than the predetermined threshold (step S52 of Fig. 9), the motor 12 is stopped (step S53 of Fig. 9).

However, when the load of the washing and dewatering tank 6 is low, the inertial force after reaching the low speed upper target speed of 240 rpm is small, and the acceleration to the low speed upper target speed of 240 rpm does not require large electric power, so the work ratio is reduced to a small extent. . Therefore, the reference work ratio decrement function can be changed by the load of the laundry dewatering tank 6, or the water level detection can be performed by the corrected maximum working ratio and the displayed load amount when the low load is not likely to cause longitudinal vibration. Data is detected to prevent false detections.

Further, in the second detecting operation, since the reference operating ratio is used, it is possible to cope with abnormal vibrations under various loads (washing objects such as the laundry dewatering tank 6). Further, since the correction operation ratio is employed, it is possible to cope with variations in the circuit (parallax), changes in the power supply voltage, mechanical fluctuations in the washing and dewatering tank 6, and resistance of the bearing oil seal portion of the motor 12 that rotates the washing and dewatering tank 6. The error caused by the detection. Therefore, in the comparison of the working ratio and the threshold value, by using the reference working ratio of the power supply voltage and the correction working ratio, abnormal vibration can be performed without affecting the load amount or the variation of the control circuit or the washing machine body. Detection.

Further, when the load (the laundry or the like in the laundry dewatering tank 6) is water such as a blanket and may be abnormal vibration detection, the dehydration program can be restarted (restarted) immediately according to the situation, whereby It can be determined again whether it is abnormal vibration detection caused by a large amount of water such as a blanket.

(The operation of the third detecting means, hereinafter referred to as the third detecting action)

The first detecting operation and the second detecting operation are abnormal vibration detection in a low-speed rotation region which is far lower than the target high-speed spin-drying speed of the motor 12 (800 rpm in the embodiment). Although the abnormality detection can be ended after the first detection operation and the second detection operation, in order to perform more accurate abnormality detection, the third detection operation described below is provided in the present invention.

The third detecting operation is performed according to the following lateral swinging means, that is, the rotational speed of the motor 12 is controlled by the duty ratio of the PWM signal supplied to the inverter circuit 70, and the inverter circuit 70 includes The switching element that rotationally drives the motor 12 of the washing and dewatering tank 6 is driven to rotate in accordance with the target high-speed dehydration rotation speed (800 rpm in the embodiment), and the PWM signal is applied in the high-speed rotation state of the motor 12. The work ratio is set to the correction work ratio corrected to the condition at this time, and the change of the correction work ratio is observed, and the threshold value of the reference work ratio obtained before entering the high-speed rotation state is compared with the corrected work ratio. To determine the anomaly detection.

In this way, the third detecting operation is an abnormality detection with respect to the lateral vibration in the high-speed region near the target high-speed dehydration rotation speed (800 rpm in the embodiment), and observes the change of the correction working ratio under the high-speed rotation, by the reference working ratio. The threshold is switched and stopped by the motor 12 to prevent abnormal vibration. Therefore, the correction work ratio (α value) roughly determined by the load amount of the medium-speed rotation speed (approximately half of the target high-speed dehydration rotation speed 800 rpm, 400 rpm in the embodiment) and the laundry dewatering tank 6 is not affected by the vibration. Set as the reference working ratio, and determine the threshold value of the change due to the alpha value (the function of the rotational speed and the reference working ratio) by the measurement of the reference working ratio at the high speed, when the corrected working ratio is the threshold The motor 12 is stopped or controlled at the above or above, or the rotational speed for the continuous dehydration process is changed by the correction operation ratio being greater than or equal to the threshold value.

In addition, the third detecting means sets a certain acceleration zone in a high-speed region close to the target high-speed dehydration rotational speed, and the certain acceleration zone includes: a work ratio ratio obtaining means for gradually obtaining the PWM signal; When the voltage is in a state of being lowered from a predetermined constant state (a DC voltage of approximately 280 volts in the embodiment), the gradually obtained operation ratio is corrected to a DC power supply voltage corresponding to the predetermined constant state. The second correction operation ratio correction means; and the third imbalance determination means for determining the presence or absence of the imbalance of the laundry dewatering tank 6 by comparing the second correction operation ratio with a predetermined threshold value.

The third imbalance determining means is to be every predetermined time interval in a predetermined number of rotations (400 rpm in the embodiment) of the second constant acceleration zone having a lower rotation speed than when the operation ratio of the gradually obtained operation is obtained. The average value of the plurality of second correction operation ratios obtained in the fourth embodiment (4 milliseconds) is set as the second reference duty ratio (α value), and the second reference duty ratio (α value) is changed. The calculated threshold value (a function of the number of revolutions and the second reference duty ratio) is compared with the second reference duty ratio (α value) to determine the presence or absence of the imbalance in the laundry dewatering tank 6.

The details will be described below.

The second detecting operation is performed while maintaining the number of revolutions of the motor 12 at 240 rpm. However, after the second detecting operation is completed (step S54 of FIG. 9), as shown in FIG. 5, the scheduling is continued. After the dehydration operation of maintaining the rotation speed of the motor 12 at 240 rpm for a time (several seconds), the rotation speed of the motor 12 is accelerated from 240 rpm toward the target high-speed dehydration rotation speed (800 rpm in the embodiment), and as shown in FIGS. 11 to 14 As shown in the figure, the third detection operation is performed. Specifically, the number of revolutions of the motor 12 is set to a predetermined target high-speed dehydration rotation speed (800 rpm in the embodiment) from a median rotation speed of 240 rpm, and the acceleration is substantially accelerated so as to gradually increase the rotation speed with a lapse of time.

This constant acceleration is performed by the inverter circuit 70 that the motor 12 is accelerated at a relatively constant acceleration (60 rpm/s in the embodiment) to a low acceleration (30 rpm/s in the embodiment). It must be accelerated. In this case, since the amount of laundry in the laundry dewatering tank 6 is sufficient to contain a sufficient amount of water at the end of the second detecting operation, if the rotational speed is increased at a high acceleration, the The water of the laundry is largely removed, and the water after the removal cannot be completely drained from the drain 21 at the bottom of the outer tank 4, so that a large amount of water is stored in the bottom of the outer tank 4 to become the resistance of the rotation of the washing and dewatering tank 6. . In order to prevent this, the water removed from the laundry can be completely drained from the drain 21 at the bottom of the outer tank 4 without becoming a resistance to the rotation of the washing and dewatering tank 6, and in the setting of the embodiment, The full acceleration is 60 rpm/s, but a certain acceleration is performed at half the extent of 30 rpm/s.

Hereinafter, the operation of the third detecting means of the high-speed eccentricity detecting operation will be described based on Figs. 11 to 14 . In step S60 of Fig. 11, the rotation speed of the motor 12 is accelerated from 240 rpm to the target high-speed dehydration rotation speed (800 rpm in the embodiment), and the predetermined number before reaching the target high-speed dehydration rotation speed (800 rpm in the embodiment) is reached. When the number of revolutions (400 rpm in the embodiment) is started, the α value as the reference duty ratio is obtained (step S61 in Fig. 11). At this time, when 400 rpm is reached or when it is over, the duty ratio of the PWM signal is obtained every 4 ms as a predetermined time interval, but the obtained work ratios are corrected, and the corrected work ratio is updated from the latest.遡 Calculate the average of the five values as the alpha value. The reference duty ratio (α value) at this time is the same as the case where the reference duty ratio d0 is set to the corrected reference duty ratio d0 described in the second detecting operation, and the power source voltage detecting circuit 76 constantly detects the power source. The voltage is corrected by the ratio of the operation ratio at the time point obtained every 4 ms to the duty ratio corresponding to the normal power supply voltage (a DC voltage of approximately 280 volts).

The operation of the third detecting means is configured to increase the first high-speed rotation after reaching the target first rotational speed (400 rpm in the embodiment) until reaching the target high-speed dehydration rotational speed (800 rpm in the embodiment). 1 (in the embodiment, 600 rpm to 699 rpm), which performs the third detecting operation (indicated as detecting 3-1 in the embodiment), and in the second rising high-speed rotating region (in the embodiment, 700 rpm to The third detection operation is performed in 800 rpm of the target high-speed dehydration rotation speed (indicated as detection 3-2 in the embodiment).

Fig. 12 is a flow chart showing the high-speed eccentricity detecting operation (indicated as detection 3-1 in the embodiment) of the first high-speed rotation zone (600 rpm to 699 rpm in the embodiment). In Fig. 12, in the first detection operation 1 (detection 3-1), after the first rotation speed (400 rpm in the embodiment) is reached, the acceleration is further performed to reach 600 rpm (step S62 in Fig. 12). The counter is started (step S63 of Fig. 12), and it is determined whether or not a predetermined time (here, 0.3 second) has elapsed (step S64 of Fig. 12). When 0.3 seconds has elapsed, the counter is initialized (step S65 of Fig. 12). . Next, in step S66 of Fig. 12, the number of revolutions of the motor 12 at the time (the number of revolutions shown in Fig. 12) and the correction duty ratio dnn indicated by the PWM duty ratio of the inverter circuit 70 are obtained. The rotational speed of the motor 12 is obtained by the rotation detecting circuit 75.

The correction operation ratio dnn is a work ratio in which the PWM signal is acquired every 4 ms (4 ms) from the time point, and the obtained work ratio is corrected. The correction operation ratio dnn is the same as that of the aforementioned α value, and the power supply voltage detecting circuit 76 constantly detects the power supply voltage, and corrects the working ratio of the time point obtained every 4 ms (4 milliseconds) to be equivalent. The corrected duty ratio of the duty ratio of the regular supply voltage (approximately 280 volts DC). Thus, by using the correction work ratio, even if the load applied to the motor 12 (the laundry in the laundry dewatering tank 6 and the laundry dewatering tank 6, and the resistance of the oil seal portion of the bearing of the motor 12) is affected by the correction work, The correction is compared with the correction reference operation ratio that is corrected in accordance with the power supply voltage at the time when the correction operation ratio is obtained, so that the detection fluctuation is not affected.

Then, the threshold value is determined in step S67 of Fig. 12. This threshold is calculated by (rotation speed at this point in time) x a + b. These a and b are values determined by the aforementioned alpha value and vary depending on the alpha value. Next, in step S68 of Fig. 12, the acquired correction operation is compared with the latest value of dnn to calculate the cumulative value of five values. In step S69 of Fig. 12, the number of revolutions of the motor 12 is compared with a predetermined number of revolutions (700 rpm of the start speed of the detection 3-2). If it is 700 rpm or more, the process proceeds to step S72 of Fig. 12 and continues to detect. Measuring action. On the other hand, if the rotation speed of the motor 12 is less than 700 rpm, the process proceeds to step S70 of Fig. 12, and the cumulative value of the five correction operation ratios dnn calculated in step S68 is determined by the threshold value determined in step S67. When the values are compared, if the cumulative value of the five correction operation ratios dnn does not reach the threshold value, the process returns to step S63 of Fig. 12 and the counter is started again, and the above-described steps are repeated. Then, if the cumulative value of the five correction operation ratios dnn is equal to or greater than the threshold value in step S70, the process proceeds to step S71 of Fig. 12, and the main control unit 40 stops the control of the motor 12 and applies a brake. The rotation of the laundry dewatering tank 6 is stopped.

In this way, when abnormality detection is performed to stop the motor 12, in order to correct the unbalanced state of the laundry in the laundry dewatering tank 6, the predetermined water injection of the laundry dewatering tank 6 is automatically performed by the operation of the main control unit 40. After that, an unbalanced washing procedure for automatically eliminating the imbalance is performed. The unbalanced washing program starts any one of the general plurality of washing programs or the one-time washing program in accordance with the program setting of the main control unit 40. After the completion of the washing process, the draining is automatically performed, and the operation of the motor 12 in the stopped state is restarted, and the spin-drying process is started from the beginning, and the same detecting operation as described above is performed.

In the above, when the process proceeds to step S71 in Fig. 12 and the abnormality detection of the motor 12 is stopped by the main control unit 40, the stop control determination (abnormal detection) of the motor 12 is performed once. After performing the above-described unbalanced washing process, the drainage is automatically performed, and the operation of the motor 12 in the stopped state is restarted, and the dehydration process is started from the beginning, and the same detection operation as described above is performed, but In the manner of this mode, as shown in FIG. 11, in the next step S711, when the stop control of the motor 12 continuously reaches a predetermined plurality of times (two consecutive times in the embodiment), the process proceeds to FIG. In step S712, an unbalanced washing program for performing the above-described imbalance correction is executed. Further, when the stop control determination (abnormal detection) of the motor 12 has not reached the predetermined plurality of times (in the embodiment, it is once), the process proceeds to step S713 of Fig. 11, and the above-described unbalanced washing program is not performed automatically. The operation of the motor 12 in the stopped state is re-opened, and the dehydration process (this is referred to as restart) is performed from the beginning, and the same detection operation as described above is performed.

As described above, when the process proceeds to step S72 of FIG. 12 and the detection operation is continued, the flow proceeds to the flowchart of FIG. 13 and the third detection operation is performed 2 (in the embodiment, the detection is performed as 3). -2). In other words, in step S72 of Fig. 13 which is the same as step S72 of Fig. 12, the counter is started (step S73 of Fig. 13) in a state where the number of revolutions of the motor 12 reaches 700 rpm, and it is determined whether or not a predetermined time has elapsed (here) When it is 0.3 second) (step S74 of Fig. 13), when 0.3 seconds has elapsed, the counter is initialized (step S75 of Fig. 13). In step S76 of the subsequent thirteenth figure, the rotation speed of the motor 12 at that time is obtained in the same manner as the acquisition of the correction operation ratio dnn in step S66 of Fig. 12 (the number of revolutions is shown in Fig. 13). The correction operation ratio dnn is indicated by the PWM operation ratio indicated to the inverter circuit 70.

Then, the threshold value is determined in step S77 of Fig. 13. The threshold is calculated by (rotation speed at this point in time) x a + b. These a and b are values determined by the aforementioned alpha value and vary depending on the alpha value. Next, in step S78 of Fig. 13, the obtained correction operation ratio dnn is calculated from the latest value of the cumulative value of five values. Next, in step S79 of Fig. 13, the rotation speed of the motor 12 is compared with the target high-speed dehydration rotation speed 800 rpm, and if it reaches 800 rpm, the process proceeds to step S80 of Fig. 13 and the dehydration operation is continued at the target high-speed dehydration rotation speed 800 rpm. . Further, if the rotation speed of the motor 12 does not reach the target high-speed dehydration rotation speed of 800 rpm, the process proceeds to step S81 of Fig. 13, and in step S81, the cumulative value of the five correction operation ratios dnn calculated in step S78 is compared with the step S77. When the determined threshold value is compared, if the cumulative value of the five correction operation ratios dnn does not reach the threshold value, the process returns to step S73 of Fig. 13 and the counter is restarted, and the above-described steps are repeated. Then, in step S81, if the cumulative value of the five correction operation ratios dnn is once or more than the threshold value or exceeds the threshold value, the detected value is detected. When the detected state is reached, the process proceeds to step S82 of FIG. 13 to determine whether the rotational speed of the motor 12 (detecting the rotational speed, which is indicated as the detected rotational speed in step S82) at the detected time is 700 rpm or more. When the rotation speed of the motor 12 is within this range, the main control unit 40 changes the PWM operation ratio to reduce the speed by 800 rpm to the lower target rotation speed (Fig. 13). Step S83). Further, in step S82 of Fig. 13, if the number of revolutions of the motor 12 is outside this range, the main control unit 40 changes the PWM duty ratio so that the target high-speed spin-drying speed 800 rpm is lowered to the upper target rotational speed of 750 rpm. Deceleration control (step S84 of Fig. 13).

In either of step S83 of FIG. 13 and step S84 of FIG. 13, the detection rotation speed (set to Lrpm) is obtained by the rotation detecting circuit 75 in step S85. Next, the maximum number of revolutions (set to Krpm) due to the deceleration control in step S83 of FIG. 13 or step S84 of FIG. 13 is measured (step S86 of FIG. 13). Although the overshoot is in the deceleration state, it means that the rotational speed is higher than the rotational speed at the start of deceleration due to the centrifugal force of the washing and dewatering tank 6, and the maximum rotational speed (Krpm) is the portion of the overshoot, which is constant at the maximum rotational speed. The speed determined when the time has not been updated.

In the state where no overshoot occurs, if the target rotation speed is to be stabilized, the acceleration must be gradually weakened from the state close to the target rotation speed. Thus, when the acceleration is weakened, the abnormality detection within the range may fluctuate. However, in the present invention, by generating an overshoot, even if the acceleration is not attenuated in a state close to the target rotational speed, such a detection variation is not generated and a stable detection result can be obtained.

In step S87 of Fig. 13, K>L+30 is calculated, and when K is greater than L+30, the motor is operated with L+30 rpm as the target number of revolutions and the dehydration operation is continued (step S89 of Fig. 13). At this time, it is controlled to discard 1 digit. On the other hand, when K is less than L+30, the motor is operated with Krpm as the target number of revolutions and the dehydration operation is continued (step S88 of Fig. 13). At this time, it is controlled to discard 1 digit. The numerical value of 30 in the formula of L+30 is a numerical value for determining the rotational speed of the motor 12 at the time when the abnormal vibration of the washing machine SW becomes large.

Figure 14 shows the accumulation of the threshold value and the five correction work ratios dnn determined in 1 (detection 3-1) of the 3rd detection operation in relation to the rotation speed (represented as the number of revolutions in the figure). How the relationship of values changes.

As described above, the third detecting means can stop the motor 12 when the correction operation ratio is equal to or greater than the threshold value, or can be controlled by the rotation speed when the correction operation ratio is equal to or greater than the threshold value. The change in the rotational speed for the continuous dehydration process is performed, so that it is possible to control the stop of the motor or to continue the dehydration process in response to the detection of the lateral vibration at the time of high-speed rotation.

In addition, in the case where the abnormality detection may occur when the laundry in the laundry dewatering tank contains a large amount of water due to the third detecting means, it is possible to consider whether or not to restart according to the situation. Therefore, in the initial abnormality detection, by performing the re-starting of the dehydration process, it is possible to reconfirm whether abnormality detection is formed when the laundry contains a large amount of water. Specifically, in the third detection operation 1 (detection 3-1), when an abnormality is detected, the motor 12 is automatically stopped immediately, and the unbalanced washing process is not performed and restarted, that is, again. Dehydration procedure. Further, when the abnormality detection is repeated a plurality of times (two times in the embodiment), in order to automatically perform the imbalance correction, after the water in the washing and dewatering tank 6 is water-filled and the uneven washing is performed, the dehydration process is performed again. . Therefore, in the initial abnormality detection between the general dehydration processes, by restarting, that is, performing the dehydration process again, it can be confirmed again that the eccentricity of the laundry of the laundry dewatering tank 6 is caused by The amount of water removed from the blanket-like laundry is caused by the resistance of the rotation of the laundry dewatering tank 6. When the abnormality detection is again formed, it is determined that the eccentricity of the laundry of the laundry dewatering tank 6 is caused by the water in the washing and dewatering tank 6 and the washing is performed to eliminate the imbalance (the eccentricity of the laundry). A dehydration procedure is performed whereby the desired dehydration can be achieved.

In addition, in the 3rd detection action 2 (detection 3-2), when the target high-speed dehydration rotation speed is 800 rpm, at the time when the vibration detection is formed, it can be continued at a lower rotation speed than 800 rpm. The operation is completed and the dehydration process is ended.

Further, in the third detection operation 1 (detection 3-1) and the third detection operation 2 (detection 3-2), by setting the reference based on the alpha value, the detection fluctuation can be suppressed. That is, the fluctuation of the power source voltage causes the cumulative value to vary due to the reference alpha value itself as the duty ratio, and the amount of laundry (load amount) due to the laundry dewatering tank 6 or the individual difference of the washing machine itself (motor 12) The resistance of the oil seal portion, etc., causes a detection error, but in the present invention, the threshold value is changed by the alpha value to thereby correspond, and by applying the correction work ratio, even if the load is applied to the motor 12 (The influence of the laundry dewatering tank 6 and the laundry in the laundry dewatering tank 6 and the individual difference of the washing machine itself, the resistance of the oil seal portion of the bearing of the motor 12, etc.), also because the correction work ratio is set to the point at which the work ratio is obtained The power supply voltage is used to correct the corrected work ratio, so it does not affect the detection variation.

In addition, for the abnormal vibration formed by the lateral swing in the dehydration process, the change of the correction work ratio under high-speed rotation (600 rpm to 800 rpm in the embodiment) is observed, and the threshold value is switched by the reference work ratio, and by The motor 12 is stopped to prevent damage caused by abnormal vibration. Therefore, the correction work ratio (α value) which is roughly determined by the amount of dehydration (the medium speed rotation speed 400 rpm which is less susceptible to vibration) and the load amount of the washing and dewatering tank 6 is set as the reference work ratio, and the reference work ratio is used. The determination determines the threshold (the function of the speed to the reference duty ratio) from which the change is made, and changes the next procedure by correcting the speed at which the duty ratio exceeds the threshold.

Thus, by setting the alpha value as the reference duty ratio, the variation of the detection can be suppressed. That is, the fluctuation of the power supply voltage detected by the power supply voltage detecting circuit 76, the cumulative value is also changed with respect to the reference value of the alpha value itself, and the load applied to the motor 12 (the laundry dewatering tank) 6 Unlike the laundry in the laundry dewatering tank 6, and the resistance of the bearing oil seal portion of the motor 12, etc., it can be suppressed by changing the threshold value by the alpha value.

In addition, in the high-speed detection, since the overshoot state is formed, the stable detection can be performed, and the detection can be performed corresponding to various rotation speeds. In addition, in the high-speed detection, when the abnormality detection is performed at 700 rpm or more, the detection operation is constantly performed until the target high-speed dehydration rotation speed of 800 rpm is reached, and the target rotation speed can be finely switched in units of 10 rpm. Improve detection accuracy.

Further, in the third detecting operation, since the reference working ratio is used, it is possible to cope with abnormal vibrations under various loads (washing objects such as the laundry dewatering tank 6). Further, since the correction operation ratio is employed, it is possible to cope with fluctuations in the circuit, fluctuations in the power supply voltage, mechanical fluctuations in the washing and dewatering tank 6, and resistance of the bearing oil seal portion of the motor 12 that rotates the washing and dewatering tank 6. Detection error.

Further, in the first detection operation to the third detection operation, the reference work ratio and the correction operation ratio are average values of values obtained at predetermined time intervals, and the obtained work ratios are set at predetermined time intervals. The intermediate value of the obtained value, thereby improving the detection accuracy.

When the ambient temperature of the washing machine SW is high, or when the drying unit KS for drying the laundry after the laundry is finished in the washing and dewatering tank 6 in the drying process is provided, the outer tank 4 made of synthetic resin may become hot. However, the resonance point of the vibration is lowered, and in particular, an error is generated in the abnormality detection under high-speed rotation, and there is a case where an error occurs in the third detection operation. In order to cope with such a situation, the temperature at which the outer tank 4 is heated may be detected before the start of the dehydration process. If the temperature is higher than a predetermined high temperature (for example, 30 ° C), the target high-speed dehydration rotation speed of 800 rpm is lowered to be corrected to, for example, 750 rpm. Further, as described above, the correction work ratio (α value) which is roughly determined by the amount of dehydration (the medium-speed rotation speed of 400 rpm which is less susceptible to vibration) and the load amount of the washing and dewatering tank 6 is set as the reference work ratio, but When the point at which the α value is obtained is a predetermined high temperature (for example, 30 ° C) or more, the threshold value is corrected in response to the high temperature. Thereby, the abnormal vibration detection in the third detecting means can be correctly performed.

Detecting whether the temperature is higher than the predetermined high temperature (for example, 30 ° C) or more, in order to detect the temperature of the outer tank 4 indirectly, by detecting the ambient temperature of the washing machine SW or the internal temperature of the washing machine SW The heat resistor provided in the manner is detected, and the main control unit 40 performs correction of the target high-speed spin-drying speed or correction of the threshold value. On the other hand, when the drying unit KS is provided, since the thermal resistor 45 which detects the temperature of the warm air heated by the electric heater HT is provided, the thermal resistor 45 can be used, and the drying unit KS does not In the non-drying operation state of the operation, the temperature detected by the thermistor 45 is substantially the ambient temperature of the outer tank 4. Further, in the operating state of the drying unit KS, the outer tank 4 is in a warming state, so According to the temperature detection of the thermistor 45, the main control unit 40 performs the correction of the target high-speed spin-drying speed or the correction of the threshold value.

[Industry use possibility]

The washing machine of the present invention has an effect in a vertical drum washing machine in which the rotating shaft is vertically or slightly inclined and has an opening thereon, but the configuration of the washing machine is not limited. Therefore, as long as it is a washing machine for washing, washing, and dehydrating, it can be applied to a washing machine having other functions such as a drying program and a sterilization program.

1. . . Outer box

2. . . Laundry input

3. . . Upper cover

4. . . Outer slot

5. . . Hanging stick

6. . . Laundry dewatering tank

7. . . Water hole

8. . . Groove shaft

9. . . Laundry rotary

10. . . Wing shaft

11. . . Drive mechanism

12. . . motor

13. . . Clutch mechanism

14. . . Speed reduction mechanism

15. . . Belt brake mechanism

16. . . Torque motor

17. . . Water injection section

18. . . Water supply port

19. . . Water supply pipe

20. . . Water supply valve

twenty one. . . Drainage port

twenty two. . . Drain pipe

twenty three. . . Drain valve

29. . . Vibration detecting rod

30. . . Operation panel

31. . . Circuit unit

40. . . Main control department

41. . . Load drive unit

43. . . Operation department

44. . . Display department

45. . . Thermal resistor

46. . . Water level sensor

47. . . Vibration detection switch

48. . . Bath pump

49. . . buzzer

50. . . Motor mount

51. . . Upper bearing box

52. . . Lower bearing box

53. . . Upper bearing

54. . . Oil seal

55. . . Upper gear box

56. . . Lower gear box

57. . . Gear mechanism

58. . . Drive shaft

59. . . Lower bearing

60. . . Clutch gear

61. . . Clutch spring

62. . . ratchet

63. . . Detent

64. . . Clutch lever

65. . . Clutch axis

66. . . Coil spring

67. . . Brake belt

68. . . Brake rod

70. . . Inverter circuit

71. . . AC to DC conversion circuit

72. . . Switch circuit

73. . . Drive department

74. . . Motor control unit

75. . . Rotary detector

76. . . Power supply voltage detection circuit

77. . . Current detection circuit

121. . . stator

122. . . Rotor

123. . . Stator mount

124. . . magnet

125. . . Hall element

301. . . Power button

302. . . Start button

303. . . Stroke selection button

304. . . Manual stroke setting button

305. . . Water setting button

306. . . Bath water use setting button

307. . . Reservation setting button

308. . . Travel display group

309. . . Setting content display group

310. . . Water display group

311. . . Numerical display

Fig. 1 is a longitudinal sectional side view showing an essential part of the overall configuration of the washing machine of the present invention.

Fig. 2 is a view showing the configuration of a drive mechanism portion of the washing machine of the present invention in a partial cross section.

Fig. 3 is a view showing the configuration of an electric control circuit of the washing machine of the present invention.

Fig. 4 is a plan view showing an operation panel portion of the washing machine of the present invention.

Fig. 5 is a view showing the sequence of vibration detection in the dehydration process of the washing machine of the present invention.

Fig. 6 is a flow chart showing the first detection and the second detection of the low speed zone in the dehydration process of the washing machine of the present invention.

Figure 7 is a flow chart of the first detection of the present invention.

Figure 8 is a detailed view of the first detection sequence of the present invention.

Figure 9 is a flow chart of the second detection of the present invention.

Figure 10 is a detailed view of the second detection sequence of the present invention.

Figure 11 is a flow chart showing the third detection of the high speed zone in the dehydration process of the washing machine of the present invention.

Fig. 12 is a flow chart showing the third detection speed of 600 to 699 rpm of the present invention.

Figure 13 is a flow chart showing the third detected rotational speed 700 to the target rotational speed of the present invention.

Fig. 14 is a graph showing the relationship between the eccentric cumulative value and the threshold value in the third detection of the present invention.

The representative figure has no component symbols and the meanings it represents.

Claims (11)

A washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; a motor including a motor for rotationally driving the washing and dewatering tank; and a switching element for driving the motor by periodically opening and closing And an inverter circuit, and a speed detecting means for detecting the rotational speed of the motor; and determining a PWM signal supplied to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means a washing machine that performs dehydration of the laundry in the washing and dewatering tank by rotating the washing and dewatering tank at a high speed, wherein the laundry is detected around the rotating shaft during dehydration. When the rotation speed of the motor is raised to the set target high-speed dehydration rotation speed by the offset, the predetermined low-speed lower target rotation speed is started to a predetermined low-speed upper target rotation speed. The method of accelerating the motor in a certain manner is set to be the first in the region lower than the target high-speed dehydration rotation speed. The acceleration zone is configured to determine the value of the difference between the rotation speed of each predetermined time when the rotation speed of the motor is increased to the low speed upper target rotation speed, and the predetermined threshold value. And a first detecting means for determining whether or not the water tank is uneven; and a control means for stopping the control of the motor when the first detecting means detects the imbalance of the washing and dewatering tank. A washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; a motor including a motor for rotationally driving the washing and dewatering tank; and a switching element for driving the motor by periodically opening and closing And an inverter circuit, and a speed detecting means for detecting the rotational speed of the motor; and determining a PWM signal supplied to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means a washing machine that performs dehydration of the laundry in the washing and dewatering tank by rotating the washing and dewatering tank at a high speed, wherein the laundry is detected around the rotating shaft during dehydration. Adjusting the imbalance of the washing and dewatering tank caused by the offset, and setting a rotation speed of the motor to the set target high-speed dehydration speed, and setting a constant-speed rotation area for operating the motor at a predetermined target rotation speed, and Provided by: a difference between a reduction in a work ratio for maintaining the aforementioned predetermined target rotational speed and a decrease in a reference work ratio, Comparing the threshold value to determine the second detecting means for determining the imbalance of the laundry dewatering tank; and providing: when the second detecting means detects the imbalance of the washing and dewatering tank, performing the motor Stop the control of the control. A washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; a motor including a motor for rotationally driving the washing and dewatering tank; and a switching element for driving the motor by periodically opening and closing Inverter circuit and turn for detecting the aforementioned motor a speed detecting means; and a driving control means for determining a working ratio of the PWM signal supplied to the inverter circuit based on the rotational speed detected by the speed detecting means and the motor current; and a washing machine that rotates at a high speed to perform dehydration of the laundry in the laundry dewatering tank, wherein in order to detect the imbalance of the laundry dewatering tank caused by the offset of the laundry around the rotating shaft during dehydration, When the rotation speed of the motor is increased to the set target high-speed dehydration rotation speed, the motor is fixed to a predetermined speed from a predetermined low-speed lower target rotation speed to a predetermined low-speed upper target rotation speed, and the speed is set to be higher than the target speed. The first constant acceleration zone in the zone where the spin speed is low is provided with a value generated by a difference in the number of revolutions every predetermined time when the number of revolutions of the motor is increased to the low speed upper target rotational speed, and a predetermined Comparing the limit values to determine the presence or absence of the first detection means of the imbalance of the laundry dewatering tank; a second detecting means for determining whether or not the laundry dewatering tank is unbalanced by the difference between the reduction of the operating ratio of the low-speed upper target rotational speed and the reduction of the reference working ratio, and the threshold value; (1) A means for controlling the stop of the motor when the detecting means and the second detecting means detect the imbalance of the washing and dewatering tank. A washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; a motor including a motor for rotationally driving the washing and dewatering tank; and a switching element for driving the motor by periodically opening and closing And an inverter circuit, and a speed detecting means for detecting the rotational speed of the motor; and determining a PWM signal supplied to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means a washing machine that performs dehydration of the laundry in the washing and dewatering tank by rotating the washing and dewatering tank at a high speed, wherein the laundry is detected around the rotating shaft during dehydration. When the rotation speed of the motor is raised to the set target high-speed dehydration rotation speed by the offset, the predetermined low-speed lower target rotation speed is started to a predetermined low-speed upper target rotation speed. The method of accelerating the motor in a certain manner is set to be the first in the region lower than the target high-speed dehydration rotation speed. The acceleration zone includes: a first difference calculation means for calculating a deviation between a command value for increasing the rotational speed of the motor to the low-speed upper target rotational speed and a rise value of the actual rotational speed; and a first detecting means; A first imbalance determining means for determining whether or not the laundry dewatering tank is unbalanced by comparing the value of the first difference calculating means with a predetermined threshold value; and the second detecting means has: According to the aforementioned low speed upper target Speed, the duty ratio of the PWM signal is set as a reference value setting means for the reference duty ratio; after the reference work ratio is set according to the reference value setting means, the duty ratio of the PWM signal is gradually obtained based on the low speed upper target rotational speed, and Calculating a second difference calculation means for obtaining a difference between the obtained work ratio and a reference work-ratio reduction function (a set value determined as a value of the reference work ratio decreased over time); and by using the second difference calculation means Comparing the calculated difference with a predetermined threshold value to determine a second imbalance determining means for determining the imbalance of the laundry dewatering tank; and controlling means for the first detecting means and the second detecting means When any means detects the imbalance of the laundry dewatering tank, the motor is stopped and controlled. A washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; a motor including a motor for rotationally driving the washing and dewatering tank; and a switching element for driving the motor by periodically opening and closing And an inverter circuit, and a speed detecting means for detecting the rotational speed of the motor; and determining a PWM signal supplied to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means a washing machine that performs dehydration of the laundry in the washing and dewatering tank by rotating the washing and dewatering tank at a high speed, wherein the laundry is detected around the rotating shaft during dehydration. Adjusting the imbalance of the aforementioned washing and dewatering tank caused by the offset, and controlling the rotation speed of the motor to the set target high-speed dehydration speed In the case of the first detecting means, the method of accelerating the motor from the predetermined low-speed lower target rotational speed to the predetermined low-speed upper target rotational speed is set to be the first in the region lower than the target high-speed dehydration rotational speed. a fixed acceleration zone, wherein: a first difference calculation means for calculating a change in acceleration of a command value for increasing a rotational speed of the motor to the low-speed upper target rotational speed; and the first difference calculating means a first unbalance determining means for determining whether or not the laundry dewatering tank is unbalanced by comparing the calculated calculated value with a predetermined threshold value; and the second detecting means having the aforementioned low speed upper target rotational speed The working ratio of the PWM signal is set as a reference value setting means; after the reference working ratio is set according to the reference value setting means, the operating ratio of the PWM signal is gradually obtained based on the low speed upper target rotational speed, and the obtained ratio is calculated. The ratio of work to the benchmark is lower than the benchmark (as the benchmark is determined by the value that decreases over time) The second difference calculation means for the difference between the values; and the second imbalance obtained by comparing the difference calculated by the second difference calculation means with a predetermined threshold value to determine the imbalance of the laundry dewatering tank And a control means for stopping the control of the motor when any one of the first detecting means and the second detecting means detects the imbalance of the washing and dewatering tank. A washing machine is provided with: rotating freely around a rotating shaft a washing and dewatering tank disposed in the outer tank; a motor for rotating the washing and dewatering tank, an inverter circuit including a switching element for periodically driving the motor by the switch, and a rotation speed for detecting the motor a speed detecting means; and a driving control means for determining a duty ratio of the PWM signal supplied to the inverter circuit based on the rotational speed detected by the speed detecting means and the motor current; and the washing dewatering tank a washing machine that spins at a high speed to perform dehydration of the laundry in the laundry dewatering tank, wherein in order to detect the imbalance of the laundry dewatering tank caused by the offset of the laundry around the rotating shaft during dehydration, When the rotation speed of the motor is increased to the set target high-speed dehydration rotation speed, the motor is fixed to a predetermined speed from a predetermined low-speed lower target rotation speed to a predetermined low-speed upper target rotation speed, and is set to be dehydrated at a higher speed than the target. In the first certain acceleration zone of the zone where the rotation speed is low, the system has: detecting the longitudinal swing of the washing dewatering tank a detecting means; and detecting, by the predetermined rotational speed of the motor after the determining time, a second detecting means for detecting a longitudinal swing of the washing and dewatering tank; wherein the first detecting means has: calculating the foregoing determining a first difference calculating means for accumulating a plurality of accumulated values of the rotational speed difference detected at a predetermined interval when the rotational speed of the motor is increased toward the low speed upper target rotational speed; and calculating a plurality of values of the rotational speed difference of the motor Means of cumulative value; and by adding the aforementioned cumulative value to a predetermined threshold Comparing values to determine a first imbalance determining means for determining whether or not the laundry dewatering tank is unbalanced; and the second detecting means: setting a duty ratio of the PWM signal as a reference based on the low speed upper target rotational speed a working ratio setting means; after setting the reference working ratio according to the reference value setting means, gradually obtaining the working ratio of the PWM signal based on the low speed upper target rotating speed, and calculating the obtained working ratio and the reference working ratio a second difference calculation means of a difference between a decreasing function (a set value determined as a value of a reference operation that decreases over time); and a difference calculated by the second difference calculation means and a predetermined threshold value Comparing the second imbalance determining means for determining the imbalance of the laundry dewatering tank; and providing: detecting, by the first detecting means and the second detecting means, the washing dewatering tank In the case of imbalance, the control means for stopping the control of the motor is performed. A washing machine comprising: a washing and dewatering tank rotatably disposed in an outer tank around a rotating shaft; a motor including a motor for rotationally driving the washing and dewatering tank; and a switching element including a motor that periodically drives a switch to drive the motor And an inverter circuit, and a speed detecting means for detecting the rotational speed of the motor; and determining a PWM signal supplied to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means a washing machine that performs dehydration of the laundry in the washing and dewatering tank by rotating the washing and dewatering tank at a high speed by using the driving control means, wherein In order to detect the imbalance of the laundry dewatering tank caused by the offset of the laundry around the rotating shaft during dehydration, and to control the rotation speed of the motor to the set target high-speed dehydration speed, The method of accelerating the motor from a predetermined low-speed lower target rotational speed to a predetermined low-speed upper target rotational speed, and setting the first certain acceleration region in a region lower than the target high-speed dehydration rotational speed to detect the foregoing a first detecting means for longitudinally oscillating the washing and dewatering tank; and a second detecting means for detecting a longitudinal swing of the washing and dewatering tank according to a predetermined rotational speed of the motor after the determining time; the first detecting means And a first difference calculation means for calculating a rotation speed difference detected at a predetermined interval when the rotation speed of the motor is increased toward the low speed upper target rotation speed in the determination time; and the predetermined rotation speed difference is predetermined Comparing the threshold values to determine the first imbalance determination means for determining the imbalance of the laundry dewatering tank; the second detecting means And a method for setting a duty ratio of the PWM signal to a reference value setting means according to the low speed upper target rotation speed; and setting a reference operation ratio according to the reference value setting means, gradually increasing according to the low speed upper target rotation speed Obtaining a working ratio of the PWM signal, and calculating a second difference calculating means of the difference between the obtained working ratio and the reference working ratio decreasing function (the set value determined as the value of the reference working ratio decreased over time); By The second unbalance determining means for determining whether or not the difference in the laundry dewatering tank is unbalanced by comparing the difference calculated by the second difference calculating means with a predetermined threshold value; and the first detecting means and the first detecting means (2) The detecting means for stopping the control of the motor when any one of the detecting means detects the imbalance of the washing and dewatering tank. The washing machine according to any one of claims 3 to 7, wherein the washing machine is provided with an operation unit that selects an operation mode of the washing machine, and the first detection is performed when the felt stroke is selected in the operation unit And determining, by any one of the means and the second detecting means, whether the motor stop control state formed by the control means continuously reaches a predetermined number of consecutive state determining means when the imbalance of the washing dewatering tank is detected; When the determination by the state determination means is not continuously determined to be a predetermined number of times, the detection operation is resumed from the first detection means again, and when the determination is continued for a predetermined number of times, the motor is stopped. A washing machine comprising: a washing and dewatering tank rotatably provided in an outer tank around a rotating shaft; a motor including a motor for rotationally driving the washing and dewatering tank; and a switching element for driving the motor by periodically opening and closing And an inverter circuit, and a speed detecting means for detecting the rotational speed of the motor; and determining a PWM signal supplied to the inverter circuit according to the rotational speed and the motor current detected by the speed detecting means Working in comparison with the driving control means; and performing the laundry in the washing and dewatering tank by rotating the aforementioned washing and dewatering tank at a high speed a dehydrating washing machine, wherein in order to detect the imbalance of the laundry dewatering tank caused by the offset of the laundry around the rotating shaft during dehydration, the rotation speed of the motor is set to the set target high-speed dehydration speed In the case of the ascending control, the α value which is a correction operation ratio which is substantially determined by the medium-speed rotation speed which is less susceptible to vibration and the load amount of the washing and dewatering tank is set as the reference operation ratio, and is in the high-speed rotation speed. Determining the threshold value (the function of the rotational speed and the reference working ratio) due to the aforementioned alpha value by the measurement of the reference working ratio, and stopping the motor when the corrected working ratio is above or above the threshold value Controlling, or performing a third detecting means for changing the rotational speed of the continuous dehydration process according to the rotational speed above or above the threshold value; and providing: when the third detecting means detects the foregoing When the laundry dewatering tank is unbalanced, the control means for stopping the control of the motor is performed. The washing machine according to any one of claims 1 to 7, wherein the washing machine is provided with a medium speed rotation speed that is less susceptible to vibration and a load amount of the washing and dewatering tank. Compared with the alpha value, the reference work ratio is used, and in the high-speed rotation speed, the threshold value of the change due to the aforementioned α value (the function of the rotation speed and the reference work ratio) is determined by the measurement of the reference work ratio, when the correction work is performed. The third detecting means for performing the stop control of the motor when the ratio is equal to or greater than the threshold value, or the change of the rotational speed for the continuous dehydration process based on the rotational speed when the corrected working ratio is equal to or greater than the threshold value And with When the first detecting means, the second detecting means, and the third detecting means detect the imbalance of the washing and dewatering tank, the control means for stopping the control of the motor is provided. The washing machine according to any one of claims 2 to 7, wherein the DC power supply voltage of the inverter circuit is a DC voltage that is rectified from a commercial power supply voltage and charged to a capacitor, from the second After detecting the detection means, a second constant acceleration zone is set in the high-speed rotation zone until the high-speed dehydration rotation speed of the target is reached, and the third detection means is provided in the second constant acceleration zone, and the third detection means is provided. The method includes: a working ratio obtaining means for gradually obtaining the duty ratio of the PWM signal; and when the DC voltage is in a state of decreasing from a predetermined constant state, the operation ratio obtained by the gradually obtaining is corrected to be equivalent to the foregoing Determining a second correction operation ratio of the DC power supply voltage in a predetermined constant state; and determining the imbalance of the laundry dewatering tank by comparing the second correction operation ratio with a predetermined threshold value Whether there is a third unbalanced determination means; and if: any one of the first detecting means, the second detecting means, and the third detecting means detects the laundry dewatering tank In the case of imbalance, the control means for stopping the control of the motor is performed.