JP2017064238A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a pulsator type washing machine which achieves a design at low cost without deteriorating washing performance and lint capturing performance due to load fluctuation, and which has enhanced water saving performance.SOLUTION: In the case where a motor current value detected by a current detection circuit becomes equal to or greater than a predetermined current value, motor operation time in a rotation direction in which a current value is low is prolonged, and then, the motor current value is measured again, and in the case where it becomes equal to or greater than the predetermined current value, the number of water replenishing is increased, and a setting water amount is increased. Thus, agitation and dispersion of clothing is facilitated, and a load on the motor can be alleviated without deteriorating washing performance and lint capturing performance.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a pulsator type washing machine for washing laundry such as clothes.

  Conventionally, most motors that drive pulsators of washing machines are single-phase induction motors. A single-phase induction motor rotates at a constant rotational speed determined by a power supply frequency and a reduction ratio of a reduction gear such as a gear or a belt to drive a pulsator (for example, see Patent Document 1).

  FIG. 9 shows a general fully automatic washing machine, and its configuration will be described below. The main body 1 of the fully automatic washing machine supports a suspension cylinder 3 with a plurality of suspensions 2 to suspend vibrations. The washing / dehydrating shaft 4 is hollow and has a biaxial structure. The washing and dewatering tub 7 has a dewatering hole (not shown) on the side wall and a fluid balancer 5 at the upper part of the inner periphery, and a pulsator 8 is disposed at the center bottom. The transmission mechanism 9 includes therein a reduction gear for washing, a switching clutch for the washing / dehydrating shaft 4, and a brake for dehydrating. The motor 10 is attached to the bottom of the receiving cylinder 3, and the motor-side pulley 11 and the mechanical-side pulley 13 transmit the power of the motor 10 to the washing / dehydrating shaft 4 via the belt 12.

  A water supply device 6 for supplying water into the washing and dewatering tub 7 (inside the receiving cylinder 3) is provided at the rear upper part of the main body 1, and in the washing and dewatering tub 7 (inside the receiving cylinder 3) at the bottom of the receiving cylinder 3. A drainage device 23 is provided for discharging the water outside the machine.

  The operation of the fully automatic washing machine configured as described above will be described below. When washing is performed, laundry, water and detergent are put into the washing and dewatering tub 7 and operation is started. When the operation is started, the clutch of the transmission mechanism 9 is switched to the washing side, and the power of the motor 10 is connected to the transmission mechanism 9 and the washing / dehydrating shaft 4 via the motor-side pulley 11, the belt 12, and the mechanism-side pulley 13. It is transmitted to the pulsator 8, and the laundry is moved by the flow of water generated by the rotation of the pulsator 8, and is rubbed by contact with the laundry or the washing / dehydrating tub 7 and the pulsator 8.

  At the time of dehydration, the clutch of the transmission mechanism unit 9 is switched to the dehydration side, and the power of the motor 10 is connected to the transmission mechanism unit 9 and the washing / dehydration shaft 4 via the motor side pulley 11, the belt 12, and the mechanism side pulley 13. This is carried out by transmitting to the washing / dehydrating tub 7 and rotating the washing / dehydrating tub 7 at a high speed to separate the moisture from the laundry by centrifugal force.

  Further, as a technique for variable speed control of the rotation of the motor 10, a method has been proposed in which the rotation of the three-phase induction motor is variable speed by V / F control using an inverter circuit (see, for example, Patent Document 2).

  Moreover, in the case of the determination result with an overload state, the method of supplying water to a high water level and driving a motor is proposed (for example, refer patent document 3).

JP-A-5-96079 JP-A-6-351292 Japanese Patent Laid-Open No. 61-238293

  However, in the conventional washing machine as shown in Patent Document 1, when an attempt is made to realize a washing machine with high water-saving performance with a reduced amount of water used, the bath ratio is reduced and the load on the motor is also increased. For this reason, the motor may be overloaded due to load fluctuation during stirring, tangling of clothes, the type of laundry, and the like. When an induction motor is used for the motor, the slip generated in the motor increases and the rotational speed decreases. This reduces the amount of movement of clothes in the washing and dewatering tank and reduces the frictional force applied to the clothes, thus reducing the cleaning power and reducing the amount of water circulating during stirring. There is a problem that lint collection performance for collecting (waste thread) is deteriorated. In order to solve these problems, a large motor torque is required, and the price of the transmission mechanism is also increased.

  Furthermore, in the inverter control as shown in Patent Document 2, when the motor is controlled at a speed by the inverter control in which the ratio V / F between the applied voltage and the frequency is controlled to be constant, the motor is caused by an overload. If the sliding becomes larger, the motor rotation speed decreases and the motor current value increases, so the heat generation of the electronic components in the control board also increases, special installation such as the installation of a dedicated cooling fan and the enlargement of the heat sink There is a problem that it is necessary to take measures for heat dissipation.

  In addition, as shown in Patent Document 3, when water is supplied up to a higher amount of water only by the determination result of the overload state, there is a problem that water saving performance is impaired and drainage time increases.

  The present invention solves the above-described conventional problems, and in a washing machine using inverter control, realizes a low-cost design without reducing washing performance and lint collection performance due to load fluctuations, and also saves water. The purpose of this is to provide a washing machine with an improved height.

  In order to achieve the above-mentioned object, the present invention provides a main body, a receiving cylinder supported by a plurality of suspensions inside the main body, a washing and dewatering tub that is rotatably supported by the receiving cylinder, and a rotation axis in a vertical direction. The pulsator, the washing / dehydrating shaft with the pulsator attached to the bottom of the washing and dehydrating tank, the motor linked to the washing / dehydrating shaft, fixed to the receiving cylinder, and connected to the receiving cylinder, A water level detection device for detecting the amount of water stored in the washing / dehydrating tub, a water supply device for supplying water into the washing / dehydrating tub, a drainage device for discharging water in the washing / dehydrating tub to the outside of the machine, and A current detection circuit that detects a current value flowing through the motor, a voltage detection circuit that detects a voltage value of the motor, and a control device that controls the motor, the water supply device, the drainage device, and the like to perform a series of washing operations; The control device comprises When a predetermined current or more flows in the current detection circuit, the water amount is changed according to the number of replenishment water by the water supply device and the set water level by the water level detection device, and the rotation direction of the pulsator is either forward or reverse. Alternatively, the present invention is a washing machine in which the motor operation time in the direction in which the detected current value is low is increased, and the motor operation time in the direction in which the detected current value is increased is shortened.

  Describing the operation of the control device in time series, if the motor current value detected by the current detection circuit is equal to or greater than a predetermined current value, the required torque varies depending on the direction of rotation depending on the position of the clothing, After increasing the motor operating time in the direction of rotation with a low current value, measure the motor current value again, and when the current value exceeds the specified current value, increase the number of makeup water and increase the set water volume It is a washing machine.

  As a result, in a washing machine with improved water-saving performance, the load on the motor is reduced even in the event of an overload, and the washing performance and lint collection performance are reduced while maintaining stable motor rotation. There is nothing. In addition, the increase in current value is stable, the increase in the amount of water used for avoiding overload can be reduced, and the amount of heat generated in the control board can also be suppressed.

  The washing machine of the present invention effectively disperses and agitates clothes, does not reduce washing performance and lint collection performance due to load fluctuations, and has improved designability and water saving performance at low cost. Can be realized.

Side sectional view of the washing machine according to Embodiment 1 of the present invention. Control block diagram of the washing machine The figure which shows the relationship between the rotation speed of the pulsator of the washing machine, motor current, and time Control flow chart of motor operation predetermined time change detection of the washing machine Flow chart for controlling the number of times of replenishing water and changing the amount of water in the washing machine Explanatory drawing of the number of times of replenishing water by voltage detection of the washing machine Explanatory drawing of water level change by makeup water of the washing machine The figure which shows an example of operation | movement predetermined time change of the washing machine Side sectional view of a conventional washing machine

  1st invention, a main body, a receiving cylinder supported by a plurality of suspensions inside the main body, a washing and dewatering tub rotatably supported by the receiving cylinder, a pulsator with a rotation axis as a vertical direction, A washing / dehydrating shaft with the pulsator attached to the bottom of the washing / dehydrating tub, a motor linked to the washing / dehydrating shaft, fixed to the receiving cylinder, and connected to the receiving cylinder, the washing / dehydrating tub A water level detection device for detecting the amount of water contained in the water, a water supply device for supplying water into the washing / dehydrating tub, a drainage device for discharging the water in the washing / dehydrating tub to the outside of the machine, and a current value flowing through the motor A current detection circuit that detects a voltage value of the motor, a voltage detection circuit that detects a voltage value of the motor, and a control device that performs a series of washing operations by controlling the motor, the water supply device, the drainage device, and the like. The device is connected to the current detection circuit. When a current exceeding a certain level flows, the amount of water supplied by the water supply device and the amount of water set by the water level detection device are changed, and the current for detecting either the forward rotation or the reverse rotation of the pulsator is detected. This is a washing machine in which the motor operating time in the direction of lower values is lengthened and the motor operating time in the direction of higher current values to be detected is shortened.

  Describing the operation of the control device in time series, when the motor current value detected by the current detection circuit exceeds a predetermined current value, the required torque varies depending on the forward and reverse rotation direction depending on the position of the clothing. After increasing the motor operating time in the rotational direction with a low current value, measure the motor current value again, and if the current value exceeds the specified current value, increase the number of makeup water and increase the set water volume By setting, in a washing machine with improved water-saving performance, even if it falls into an overload state, the load on the motor is reduced by causing the clothes to be dispersed and agitated, and a stable motor rotation speed can be maintained. Therefore, washing performance and lint collection performance are not deteriorated. In addition, the amount of water used for improving the cloth periphery is minimized, the increase in the motor current value is suppressed, and the amount of heat generated in the control board can also be suppressed.

  In a second aspect based on the first aspect, the control device adjusts an output voltage value to the motor when the voltage detection circuit detects a voltage outside a predetermined range. It is. If the voltage detection circuit has a voltage value outside the specified range, if the voltage is high, more current will flow through the motor during V / F control, and if the voltage value is low, the current value will not flow as expected and the torque will be insufficient. Therefore, by correcting the PWM output of the inverter control to an appropriate voltage, it is possible to perform load reduction treatment with higher accuracy for the motor.

According to a third aspect of the present invention, in the first or second aspect of the invention, when the voltage detection circuit detects a voltage that is greater than or equal to a predetermined range, the control device changes a number of times of replenishment water in advance. It is. If the voltage detection circuit has a voltage value greater than or equal to a predetermined value, a current exceeding the expected value will flow to the motor during V / F control, and the torque limit current will be exceeded. Stirring and dispersion can be further promoted, an increase in the motor current value can be suppressed, and the amount of heat generated in the control board can also be suppressed.

  In a fourth aspect based on the first to third aspects, the control device detects a current value exceeding a predetermined range for a certain period of time when the control device changes the number of times of replenishment water or the set amount of water. If not, the water is drained to a predetermined water level by the drainage device. When changing the number of replenishing water or setting water volume to reduce the motor overload, it may be operating with a large amount of water even though the overload condition has been improved. Therefore, if a current exceeding a predetermined level is not detected for a certain period of time, it is determined that the overload condition has been improved, and drainage is gradually reduced to a predetermined level, thereby shortening the drainage time. Can be planned.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a side sectional view of a washing machine according to Embodiment 1 of the present invention, FIG. 2 is a control block diagram of the washing machine, and FIG. 3 is a graph showing the rotation speed, motor current, and time of the pulsator of the washing machine. It is a figure which shows a relationship.

  In FIG. 1, a main body 1 of a washing machine supports a suspension cylinder 3 with a plurality of suspensions 2 to suspend vibrations. The washing / dehydrating shaft 4 is hollow and has a biaxial structure. The washing and dewatering tub 7 has a large number of dewatering holes (not shown) on the side wall. The washing and dewatering tub 7 has a fluid balancer 5 at the top of the inner periphery, and a pulsator 8 formed in a pan-shaped shape with the outer periphery as an inclined surface is disposed at the center bottom. The transmission mechanism 9 includes therein a reduction gear (not shown) for washing and a switching clutch (not shown) for the washing / dehydrating shaft 4 and a brake (not shown) for stopping the washing / dehydrating tub 7 during dehydration. Built-in). The motor 10 is attached to the bottom of the receiving cylinder 3, and transmits the power of the motor 10 to the washing / dehydrating shaft 4 through the motor-side pulley 11, the belt 12, and the mechanical-side pulley 13.

  A water supply device 6 for supplying water into the washing and dewatering tub 7 (inside the receiving cylinder 3) is provided at the rear upper part of the main body 1, and in the washing and dewatering tub 7 (inside the receiving cylinder 3) at the bottom of the receiving cylinder 3. A drainage device 23 is provided for discharging the water outside the machine. The water level detection device 17 is connected to the bottom of the receiving cylinder 3 and detects the water level (water amount) in the washing and dewatering tub 7.

  A control device 14 is installed on the back surface of the main body 1. As shown in FIG. 2, the control device 14 detects the current value flowing in the U phase, V phase, and W phase of the motor 10 detected by the current detection circuit 20 and the motor 10 detected by the position detection circuit 18 attached to the motor 10. The number of rotations of the motor 10 is successively monitored based on the rotor position detection information. The control device 14 generates a PWM output to the motor 10 based on voltage information detected by a voltage detection circuit 16 that detects a voltage generated by rectification from a commercial power source and applied to an inverter control circuit 22 that controls driving of the motor 10. Adjust to the appropriate voltage. Further, the control device 14 controls the motor 10, the water supply device 6, the drainage device 23, etc. to perform washing operations such as washing, dehydration and rinsing.

An operation display device 15 is provided on the front upper portion of the main body 1. The operation display device 15 includes an operation unit that allows a user to perform input operations related to driving such as turning on and off the power and selecting a washing course, and a display unit that displays various information related to driving. Is being exchanged.

  About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated.

  When washing is performed, laundry such as clothes, water and detergent are put into the washing and dewatering tub 7 and operation is started. When the operation is started, the clutch of the transmission mechanism unit 9 is switched to the washing side, and the power of the motor 10 is connected to the transmission mechanism unit 9 and the washing / dehydrating shaft 4 via the motor side pulley 11, the belt 12, and the mechanism side pulley 13. It is transmitted to the pulsator 8, and the laundry is moved by the flow of water generated by the rotation of the pulsator 8, and is rubbed by contact with the laundry or the washing / dehydrating tub 7 and the pulsator 8.

  The stirring time, the number of rotations, and the amount of water during washing are determined as follows. The motor 10 is driven after the power is turned on, the inertia rotation speed when the motor 10 is turned off is detected by the position detection circuit 18, and is put into the washing and dehydrating tub 7 according to the number of pulses detected by the position detection circuit 18. The amount of water is determined by predicting the amount of laundry. At this time, in the conventional washing machine, 53 L of water was generally used for the rated 6 Kg clothing, but in the washing machine in the present embodiment, the water amount is 48 L in order to improve the water-saving performance, The bath ratio, which is the ratio of the amount of water to the amount of clothing, is also decreasing.

  Next, after supplying water to the water level determined according to the predicted amount of laundry, the motor 10 is driven in the stirring process, and the motor current value detected by the current detection circuit 20 at that time and the position detection circuit 18 The stirring time limit and the target rotation speed are determined based on the integrated value of the detected inertia rotation speed.

  In this way, the amount of water used, the stirring time limit, and the target rotation speed are determined, but depending on how the laundry is put into the washing and dewatering tub 7, for example, when large clothes are put in or when it is packed too much However, when the laundry is thrown into the washing / dehydrating tub 7 in a state where it is caught, the load is not applied on the pulsator 8, and therefore, it is determined to be smaller than the actual amount of laundry. The amount of water may decrease. As described above, the load on the motor 10 increases depending on the amount of water used for the laundry due to erroneous determination, the position and state of the laundry, the shape of the pulsator 8 and the shape of the washing and dewatering tub 7. Furthermore, when the shape of the pulsator 8 and the shape of the washing and dewatering tub 7 are non-linear, the magnitude of the load on the motor 10 varies depending on the forward rotation and reverse rotation of the motor 10.

  In the washing machine according to the present embodiment, in such a case, the slip of the motor 10 becomes large, the motor current value increases, and it is determined that the motor is overloaded. An example of this determination will be described below with reference to FIG. As a determination condition, when the motor current value increases to a current value (5.2 A in the example shown in FIG. 3) corresponding to a preset torque limit value, the operation of the motor 10 is stopped. When this occurs frequently (for example, 130 times), it is determined that the load is overloaded and the washing operation is temporarily stopped. These conditions can be changed according to the circuit configuration and the operating environment, and are not limited thereto.

  When it is determined that the motor load may reach the torque limit value depending on the motor current value, the overload detection is based on the forward rotation operation of the motor 10 based on the motor operation predetermined time change detection flowchart shown in FIG. Or whether it is due to reverse rotation.

In FIG. 4, after supplying water to the water level corresponding to the amount of laundry, the motor 10 is driven to start stirring (step S1). The motor 10 is rotated forward, the forward rotation motor current at that time is measured by the current detection circuit 20, and is stored in a storage device (not shown) by the microcomputer 21. Next, the motor 10 is rotated in the reverse direction, and the reverse rotation motor current at that time is measured by the current detection circuit 20 and is similarly stored in the storage device.

  The forward motor current data and the reverse motor current data measured and stored in this way are read from the storage device (steps S2 and S3), respectively, and a predetermined current value corresponding to a preset torque limit value (FIG. 3). In the example shown in FIG. 5, it is determined whether or not it is 5.2 A) or more, and the current values of both are compared (step S4).

  In step S4, if neither the forward motor current nor the reverse motor current exceeds the predetermined current value, the process returns to step S1, the stirring is continued, and the forward motor current and the reverse motor current are measured and stored. Read, judge and compare.

  If at least one of the forward rotation motor current and the reverse rotation motor current exceeds a predetermined current value in step S4, for example, as shown in FIG. S5) The operation is performed so as to avoid the sticking or dumpling state from the cloth by lengthening the time for rotation in the direction with a smaller current value. An example of the change of the predetermined operation time during forward and reverse rotation is shown in FIG. In FIG. 8, in the standard setting, the forward rotation and the reverse rotation are both 1.3 seconds on and 0.8 seconds off, and when it is determined that the current value is smaller during forward rotation, The on-time at the time is increased from 1.3 seconds to 1.6 seconds, the off-time is shortened from 0.8 seconds to 0.5 seconds, and the on-time at reverse rotation is increased from 1.3 seconds to 1.0 seconds Shorten the off time from 0.8 seconds to 1.1 seconds. The operation (flapping) for eliminating the sticking or dumpling state from the cloth is performed with the changed operation predetermined time setting.

  In this state, the motor current value is measured as shown in FIG. 5, and if it is overloaded by determining whether it is in an overload state, replenishment to a predetermined water level provided for each set water level based on FIG. Do water. The operation at this time will be described below with reference to the control flowchart of FIG.

  In FIG. 5, flapping is started by the predetermined operation time at the time of forward and reverse rotation changed in step S5 shown in FIG. 4 (step S11). In the following description, it is assumed that the flapping occurs according to the predetermined operation time at the time of the forward rotation and reverse rotation shown in FIG.

  First, it is checked whether or not the number of forward / reverse inversions has been performed a predetermined number (in FIG. 8, a total of 10 forward rotations and 5 reverse rotations) (step S12). Since the first time is the first time, the motor 10 is rotated forward (step S13), the forward rotation motor current at that time is measured by the current detection circuit 20, and the forward rotation motor current value is equal to or greater than the current value corresponding to the torque limit value of the motor 10. It is monitored whether it becomes (step S14). If the forward rotation motor current value is equal to or greater than the current value corresponding to the torque limit value of the motor 10, it is counted that the forward rotation abnormal current value has occurred once (step S15), and the microcomputer 21 stores the storage device (not shown). )).

  If the forward motor current value does not exceed the current value corresponding to the torque limit value of the motor 10 within a predetermined forward rotation time (1.6 seconds in FIG. 8), The motor 10 is reversely rotated (step S16). Then, as in the case of normal rotation, the reverse rotation motor current at that time is measured by the current detection circuit 20, and it is monitored whether the reverse rotation motor current value becomes equal to or greater than the current value corresponding to the torque limit value of the motor 10 (step). S17). When the reverse rotation motor current value is equal to or greater than the current value corresponding to the torque limit value of the motor 10, it is counted that the reverse rotation abnormal current value has occurred once (step S18), and the microcomputer 21 stores it (not shown). Remember me.

It is determined whether or not the total number of occurrences of the motor abnormal current value counted in step S15 and step S18 is equal to or greater than a predetermined number (step S19). The number of times of reverse rotation is checked, and if the predetermined number of times (a total of 10 in FIG. 8) has not been reached, the abnormal current value check operation in step S13 and subsequent steps is performed.

  When the number of forward and reverse rotations reaches the predetermined number (total of 10 in FIG. 8) in step S12, it is determined that a serious motor abnormal load state has not occurred, and the washing operation is continued under the same conditions. .

  In step S19, when the total number of occurrences of the motor abnormal current value exceeds the predetermined number, the water level is changed by the make-up water and the make-up water is changed to improve the bath ratio and reduce the motor load. . An example of the change in the water level and the number of times of make-up water performed in this case will be described with reference to FIGS.

  First, the water level change by makeup water will be described. As shown in the table on the left side of FIG. 7, the standard amount of water is set according to the amount of laundry, and the amount of water according to the amount of laundry placed in the washing and dewatering tub 7 is supplied at the beginning of operation. Is done. When the total number of occurrences of motor abnormal current value through flapping exceeds a predetermined number, as shown in the table on the right side of FIG. 7, in principle, the setting is changed to the amount of water when the amount of one rank fabric is large, The increment (2 to 3 L) of makeup water is supplied, the water level is changed, and the washing operation is performed. When the rotation speed of the washing and dewatering tub 7 is 130 r / min, the rotation speed is changed to 120 r / min in order to reduce the motor load.

  Next, change in the number of makeup water will be described. As shown in FIG. 6, since the amount of water in the washing and dewatering tub 7 decreases due to water absorption to the laundry being washed, etc., in order to compensate for the decreased amount of water, supply of makeup water is usually performed twice. (Normal setting). It is performed before the first washing and stirring (mode 1) and before the third washing and stirring (mode 2). If the total number of occurrences of motor abnormal current value through flapping exceeds the specified number, add 3 additional water supplies and change the settings to supply 5 total water supplies. Then, the washing operation is performed.

  Note that it is not always necessary to change the water level and the number of times of make-up water at the same time, as long as the occurrence of abnormal motor current is suppressed and the effect of reducing the motor load is sufficient. It may be only a change.

  These conditions can be changed according to the circuit configuration and the operating environment, and are not limited thereto.

  As described above, according to the washing machine of the present invention, since the bath ratio is improved even if the motor is overloaded, the load on the motor is reduced. As a result, a stable motor rotation speed can be maintained, so that the amount of water used for load reduction is minimized and the increase in current value is suppressed without deteriorating the washing performance and lint collection performance. The amount of heat generated can be suppressed.

  Needless to say, this is effective not only in washing but also in a rinsing process.

(Embodiment 2)
In the configuration shown in FIG. 2, the V / F control that is PWM output to the motor 10 by the inverter control circuit 22 by the control device 14 is input to the inverter control circuit 22 in order to output a preset voltage value at the time of startup. When the voltage is high, an unexpected current flows to the motor 10 and increases to the torque limit value of the motor 10. Conversely, when the input voltage is low, the current becomes lower than expected, resulting in insufficient torque. Therefore, the washing machine of the present embodiment adjusts the PWM output to the motor 10 to an appropriate voltage based on the voltage detected by the voltage detection circuit 16. Other configurations are the same as those of the first embodiment, and detailed description thereof is omitted.

  With this configuration, it is possible to take a more accurate motor load reduction measure.

(Embodiment 3)
In the washing machine of the present embodiment, when a high voltage is input to the voltage detection circuit 16, when the load is operated, the motor current easily flows and the motor is likely to be overloaded, and the voltage detection circuit 16 If a low voltage is input to the motor 10, the possibility that the cleaning power is reduced due to insufficient torque of the motor 10 increases. Therefore, the setting of the number of times of replenishing water is changed in advance according to the voltage detected by the voltage detection circuit 16. Is the same as in the second embodiment, and a detailed description thereof is omitted.

  An example of setting change of the number of makeup water according to the voltage is shown in the upper left table of FIG. When the power supply voltage is higher than normal and the high voltage abnormality determination value is from 110V to 150V, the number of replenishment water set to twice is normally changed to five regardless of the amount of water supplied to the washing and dewatering tub 7. Thereby, stirring and dispersion | distribution of clothing can be accelerated | stimulated more, the increase in a motor electric current value can also be suppressed, and the emitted-heat amount in a control board can also be suppressed.

  When the power supply voltage is lower than normal and the low voltage abnormality determination value is 65V to 110V, the amount of cloth is relatively small. To do. Thereby, stirring and dispersion | distribution of clothing can be accelerated | stimulated more, the increase in a motor electric current value can also be suppressed, and the emitted-heat amount in a control board can also be suppressed. In exceptional cases, the washing operation is performed without changing the normal setting of the replenishing water twice for the maximum 51 L of water with a large amount of cloth.

  These conditions can be changed according to the circuit configuration and the operating environment, and are not limited thereto.

(Embodiment 4)
When the washing machine of the present embodiment detects an overload and increases the amount of water with makeup water, when the current value corresponding to the torque limit value of the motor 10 is not detected for a certain period of time, By judging that the overload state has been improved and draining in stages to a predetermined water level, the drainage time can be shortened. The predetermined water level at this time may be a standard water level initially set according to the amount of cloth, or may be a water level specially set for this case.

  As described above, the washing machine according to the present invention can be designed in a pulsator type washing machine without effectively degrading washing performance and lint collection performance by effectively dispersing and stirring clothes. This makes it possible to improve water saving while maintaining the current main body size, and is useful as a washing machine that performs washing by rotating the pulsator forward and backward using inverter control.

DESCRIPTION OF SYMBOLS 1 Main body 2 Suspension 3 Receptacle 4 Washing / dehydration shaft 6 Water supply device 7 Washing / dehydration tub 8 Pulsator 9 Transmission mechanism 10 Motor 11 Motor side pulley 12 Belt 13 Mechanical side pulley 14 Control device 15 Operation display device 16 Voltage detection circuit 17 Water level detection device 18 Position detection circuit 20 Current detection circuit 21 Microcomputer 22 Inverter control circuit 23 Drainage device

Claims (4)

A main body, a receiving cylinder supported by a plurality of suspensions inside the main body, a washing / dehydrating tub rotatably supported by the receiving cylinder, a pulsator with a rotation axis in a vertical direction, and the washing / dehydrating tub The washing / dehydrating shaft with the pulsator attached to the bottom, the motor fixed to the receiving cylinder in conjunction with the washing / dehydrating shaft, and the amount of water stored in the washing / dehydrating tub connected to the receiving cylinder A water level detection device for detecting, a water supply device for supplying water into the washing / dehydrating tub, a drainage device for discharging the water in the washing / dehydrating tub to the outside of the machine, and a current detection circuit for detecting a current value flowing through the motor A voltage detection circuit that detects a voltage value of the motor, and a control device that controls the motor, the water supply device, the drainage device, and the like to perform a series of washing operations, the control device including the current detection More current than specified in the circuit In the case of flow, the amount of water supplied by the water supply device and the water level set by the water level detection device are changed, and the rotation direction of the pulsator is either forward or reverse, and the detected current value is in a lower direction. The washing machine is configured such that the motor operating time is increased and the motor operating time in the direction in which the detected current value is higher is shortened. The washing machine according to claim 1, wherein the control device adjusts an output voltage value to the motor when the voltage detection circuit detects a voltage outside a predetermined range. The washing machine according to claim 1 or 2, wherein when the voltage detection circuit detects a voltage exceeding a predetermined range, the control device changes the number of times of replenishing water in advance. The controller is configured to cause the drainage device to drain to a predetermined water level when the current detection circuit does not detect a current value of a predetermined range or more for a certain period of time when the number of replenishment water or the set water amount is changed greatly. The washing machine according to any one of claims 1 to 3.

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