JP2009056262A - Washing machine, drum rotating speed controlling method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve washing performance of a washing machine by appropriately controlling a rotating speed of a drum during washing since the behavior of clothes is not understood with accuracy during washing in a conventional washing machine. <P>SOLUTION: Vibrations are detected by mounting a vibration detecting part 6 on a receiving cylinder 3. A frequency component calculating part 7 extracts a frequency component corresponding to a rotating speed of the drum 1 from the vibrations. A rotating speed control part 8 determines whether laundry adheres to the inside of the drum based on whether the frequency component is greater than a prescribed value and varies the rotating speed of the drum 1 (a motor 2) based on the result. Consequently, the washing machine prevents the adhesion of the laundry and improves the washing performance. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drum-type washing machine or a washing / drying machine used in general households.

Conventionally, during washing, the behavior of the drum and the behavior of the laundry in the drum are measured and estimated, and the rotational speed of the drum is changed. For example, in Patent Document 1, an acceleration sensor is attached to a drum cylinder, and as shown in FIG. 11, the behavior of clothing is estimated from the amount of change in the acceleration sensor output and the amount of change in the torque current component of the motor. Control means for changing the number of revolutions of the motor for rotating the drum is provided.
JP 2006-346270 A

  However, with the conventional configuration described above, the rotational speed of the drum cannot always be controlled appropriately. Specifically, (1) there are various types of vibration applied to the receiving cylinder, and a simple change in acceleration output value cannot accurately grasp the behavior of clothing. For example, the vibration of the motor itself or the vibration of the housing may be applied to the receiving tube. In addition, the vibration of the receiving tube also varies depending on the amount, weight, quality, etc. of clothing, and the behavior cannot be accurately determined by a simple change in output value. (2) The same applies to the current value indicating the torque component of the motor. For example, when the amount of water is large during washing and the clothing is synthetic fiber, there is no correlation between the amount of movement of the clothing and the torque. is there.

  In order to solve the conventional problem, according to the present invention, a frequency component calculation unit that calculates a frequency component with respect to vibration detected by a sensor (vibration detection unit) installed in a receiving cylinder, and according to the magnitude of the frequency component A rotation speed control unit that changes the rotation speed of the motor is provided.

  The behavior of the garment is determined by extracting a vibration component having a specific frequency from the vibration of the receiving tube. Specifically, only the frequency component corresponding to the rotational speed of the drum is extracted from the vibration obtained by the vibration detection unit by the frequency component calculation unit. A large amount of this component occurs when the drum rotates eccentrically (that is, when the laundry is stuck inside the drum), and hardly occurs in other states.

  In the present invention, when the laundry sticking is detected, the rotation speed control unit performs an operation to reduce the motor rotation speed and suppress the sticking. In a situation where the laundry is stuck to the inside of the drum and is rotating together with the drum, the washing ability of the washing machine is improved by suppressing the sticking because the laundry is hardly done.

  By using the washing machine, drum rotation speed control method and program of the present invention, the washing ability of the washing machine can be improved. More specifically, by extracting a frequency component corresponding to the rotational speed of the drum from the vibration of the receiving tube, the state of the laundry stuck to the inside of the drum can be found. When the sticking is detected, the rotation speed control unit decreases the drum rotating speed, whereby sticking of the laundry to the inside of the drum can be suppressed, and the washing ability of the washing machine can be improved.

  1st invention detects the vibration of the drum which accommodates the laundry, the drum which accommodates the drum and is supported by the elastic support mechanism from the housing, the motor which rotates the drum, and the drum Washing machine comprising: a vibration detection unit that performs a frequency component calculation unit that calculates a frequency component with respect to the vibration detected by the vibration detection unit; and a rotation speed control unit that changes the rotation speed of the motor according to the magnitude of the frequency component It is.

  With this configuration, the rotational speed of the motor can be appropriately changed according to the vibration of the laundry or the drum.

  According to a second aspect, in the first aspect, the vibration detection unit includes at least one acceleration sensor, detects at least one vibration component in a direction such as up, down, left, and right, front and back of the receiving cylinder, and Or the sum of acceleration in each direction is output.

  Thus, when a multi-axis acceleration sensor is used for vibration detection, not only the acceleration information in each direction but also the sum for each direction can be used. Since the vibration of the receiving cylinder is not necessarily only in one direction, the vibration of the receiving cylinder can be grasped more accurately by using the sum of acceleration information for each direction.

  In a third aspect based on the first aspect or the second aspect, the frequency component calculation unit calculates a frequency component of vibration at a frequency corresponding to the rotation speed of the drum, and the rotation speed control unit has a predetermined frequency component. When the value is smaller than the value in the range, the rotational speed of the motor is increased.

  Thereby, sticking of the laundry to the drum can be prevented, and as a result, the washing ability of the washing machine can be improved.

  In a fourth aspect based on the first aspect or the second aspect, the frequency component calculation unit calculates a frequency component of vibration at a frequency corresponding to the rotation speed of the drum, and the rotation speed control unit calculates the rotation speed of the drum. While changing from the upper limit value to the lower limit value, the frequency component calculation unit obtains the frequency component value, and the subsequent washing is continued at the rotation speed when the value of the frequency component becomes a predetermined value or less.

  By performing this operation at the beginning of the washing process, it is possible to determine an appropriate drum rotation speed without causing the laundry to stick to the drum in the subsequent washing. Since the frequency component is not always calculated during washing as in the third aspect of the invention, there is an advantage that it is not necessary to make the microcomputer constituting the frequency component calculation unit high-performance. In general, when the rotational speed of the drum is low, torque is required, and large power consumption is required. In the present invention, by changing the rotational speed from the higher one, it is possible to avoid a low rotational speed in the rotational speed determination process, which can contribute to reduction of power consumption.

  In a fifth aspect based on the first aspect or the second aspect, the frequency component calculation unit calculates a frequency component of vibration at a frequency corresponding to the rotation speed of the drum, and the rotation speed control unit calculates the rotation speed of the drum. While changing from the lower limit value to the upper limit value, the frequency component calculation unit obtains the frequency component value, and the subsequent washing is continued at the rotation speed when the frequency component value becomes equal to or higher than the predetermined value.

  By performing this operation at the beginning of the washing process, it is possible to determine an appropriate drum rotation speed without causing the laundry to stick to the drum in the subsequent washing. Since the frequency component is not always calculated during washing as in the third aspect of the invention, there is an advantage that it is not necessary to make the microcomputer constituting the frequency component calculation unit high-performance. Further, by increasing the rotational speed from the lower one, it is possible to prevent the laundry from sticking to the drum in the process until the rotational speed is determined, and the overall cleaning ability can be improved.

  According to a sixth invention, in the third to fifth inventions, the frequency component calculation unit calculates a frequency in a predetermined range corresponding to a fluctuation range (variation range) of the rotation speed of the drum (a frequency corresponding to the rotation speed of the drum). The frequency component of the vibration is calculated for each frequency in the predetermined range at the center, and the maximum value or average value of the frequency components within the range is output as a frequency component corresponding to the rotational speed of the drum.

  In general, the rotation speed of the drum varies, and the rotation speed is not always completely constant in many cases. By using this invention, even if the rotational speed varies, the frequency component of vibration corresponding to the rotational speed can be obtained correctly. Thereby, the sticking of the laundry to the drum can be easily detected.

  The seventh invention includes a step of detecting the vibration of the receiving cylinder, a step of calculating a frequency component with respect to the vibration, and a step of changing the rotation speed of the motor according to the magnitude of the calculated frequency component. This is a drum rotation speed control method for a washing machine.

  By extracting a specific frequency component from the vibration of the receiving cylinder, it is possible to know the behavior of the laundry in the drum. By controlling the rotation speed of the drum according to this frequency component, the washing ability of the washing machine can be improved.

  The eighth invention is a program for causing a computer to realize at least part of the functions of the washing machine described in the first to sixth inventions. Since it is a program, a part or all of the functions of the present invention can be easily realized by using hardware resources such as an electric / information device and a computer in cooperation. Also, program distribution and installation can be simplified by recording on a recording medium or distributing a program using a communication line.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a washing machine according to a first embodiment of the present invention. The main configuration of the present invention described in the drawings will be described in order.

  (1) A drum 1 as a washing tub for storing and rotating laundry such as clothes is coupled to a motor 2 as shown in the figure, and rotates to wash the laundry. (2) The motor 2 for rotating the drum 1 is constituted by a brushless motor or the like, the rotation speed is variable, and the forward rotation and the reverse rotation are repeated in the washing process. (3) As shown in FIG. 1, the receiving cylinder 3 that accommodates the drum 1 and water is fixed to the housing 5 via an elastic support mechanism 4 such as a spring 4a or a damper 4b. (4) The vibration detection unit 6 that detects the vibration of the receiving cylinder 3 is composed of an acceleration sensor. In this embodiment, the vibration detection unit 6 detects vibration (acceleration) in the left-right direction with respect to the front of the drum as an example. And The acceleration sensor may be a semiconductor acceleration sensor, a piezoelectric acceleration sensor, or the like, and may be a multi-axis (2-axis or 3-axis) direction acceleration sensor. Since the actual vibration of the receiving tube cannot always be limited to one direction, it is preferable to use a sum of three-axis acceleration components using a three-axis acceleration sensor. (5) The frequency component calculation unit 7 that performs Fourier transform processing from the vibration (acceleration) detected by the vibration detection unit 6 and extracts a frequency component corresponding to the rotational speed of the motor is specifically configured by a microcomputer. Then, discrete Fourier transform (DFT) or fast Fourier transform (FFT) is performed from the signal obtained by the vibration detection unit 6, and the magnitude of the frequency component (Fourier amplitude spectrum, power spectrum, etc.) is calculated. The rotation speed of the drum (motor) is acquired from the rotation speed control unit 8. (6) The rotation speed control unit 8 increases or decreases the rotation speed of the motor 2 according to the magnitude of the frequency component of vibration calculated by the frequency component calculation unit 7.

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

  2 to 4 are diagrams showing the operation principle of the present invention. (A) in FIGS. 2 to 4 is an example showing the state of the laundry in the drum 1. The laundry is shown in the drum 1 in a circle, and the baffle 9 is shown in a triangle on the inside of the drum. The baffle 9 has a role of picking up the laundry and stirring it.

  FIG. 2A shows the case where the rotation speed of the drum 1 is low (41 rpm in the example in the figure). Since the rotational speed is low, a large centrifugal force does not act on the laundry, and the laundry is rotating under the drum 1 on the spot. In this case, since the rotational speed of the drum 1 is low, the amount by which the laundry is lifted by the baffle 9 is small, and is not agitated much. In this specification, this state is referred to as a “goro state”.

  FIG. 4A shows a case where the rotation speed of the drum 1 is high (49 rpm in the example in the figure). Since the rotational speed is high, a relatively large centrifugal force acts on the laundry, and the laundry is stuck to the inside of the drum 1. Since the laundry is stuck, it rotates together with the drum 1. In this specification, this state is referred to as a “sticking state”.

  FIG. 3A shows an intermediate rotational speed (45 rpm in the illustrated example) between FIG. 2A and FIG. The behavior of the laundry is also intermediate, and the laundry is lifted by the baffle 9, but since the centrifugal force is not strong enough, it is peeled off from the inside of the drum 1 on the way and falls to the lower part of the drum 1 by gravity (there is a speed) So it behaves as if it is knocked down. In this specification, this state is referred to as a “striking state”.

  Comparing FIG. 2 (a), FIG. 3 (a), and FIG. 4 (a), the state of FIG. 3 (a) is generally said to be the most suitable state for washing, and the state of FIG. 4 (a). It is said that almost no cleaning is performed.

  The rugged state in FIG. 2 (a) may cause the laundry to get entangled. In the sticking state in FIG. 4 (a), the laundry does not move at all from the wall surface, so the cleaning ability is reduced. Further, from the viewpoint of torque and power consumption applied to the motor 2, the load applied to the drum 1 is the heaviest in the rugged state of FIG. In the above-described conventional example, the determination is performed based on the torque current component. In this case, however, there is a possibility that the grooving state of FIG.

  2 (a), FIG. 3 (a), and FIG. 4 (a), with respect to vibration data obtained by the vibration detector 6 (according to the present embodiment, acceleration in the lateral direction with respect to the drum). The results of the frequency analysis are shown in FIGS. 2 (b), 3 (b), and 4 (b). The horizontal axis of the figure is the frequency [Hz], and the vertical axis is the Fourier amplitude spectrum. In each of FIGS. 2B, 3B, and 4B, a downward arrow is written at a frequency corresponding to the drum rotation speed (when the rotation speed is N rpm, the corresponding frequency is N / 60 Hz). Yes. As can be seen from FIG. 2B, the component corresponding to the drum rotation speed is small (0.68 Hz) in FIG. 2B, but considerably large (0.82 Hz) in FIG. 4B. FIG. 3B shows the middle (0.75 Hz). This is because in the sticking state as shown in FIG. 4B, the laundry sticks to the drum 1, which becomes an eccentric load on the drum 1. This tendency does not change even if the cloth type changes. If the laundry is stuck, the frequency component corresponding to the drum rotation speed increases (however, if the laundry is packed in the drum 1) Even at the rotational speed, it is stuck and the frequency characteristics are not changed.)

  In the present invention, the frequency component with respect to the rotational speed of the drum 1 is obtained by subjecting the signal of the vibration detecting unit 6 attached to the receiving cylinder 3 to Fourier transform processing by the frequency component calculating unit 7 using the above-described characteristics. . Then, the rotational speed control unit 8 determines whether the laundry is attached to the inside of the drum 1 from the magnitude of the obtained frequency component value, and if it is stuck (the frequency component is large), the motor 2 If the rotation speed is decreased and the rotation speed is not sticking (the frequency component is small), the rotation speed of the motor 2 is increased. Thereby, in the washing process, the state of the laundry becomes tapping as shown in FIG. 3A, and as a result, the washing ability is increased.

  FIG. 5 is a flowchart showing the operation of each part in the case of controlling the drum rotation speed during washing in accordance with the operation principle described above. Hereinafter, it demonstrates in order for every step. This flowchart shows the operation procedure of the washing process, and it is assumed that the processes such as the determination of the amount of cloth, the addition of detergent, and the water injection have been completed before this process.

  (Step A1) After the start of the washing process, the rotational speed control unit 8 initializes the rotational speed of the drum 1 (motor 2) to V0. V0 may be set to a value corresponding to the cloth amount detected in the previous step, or may be a fixed value.

  (Step A2) The rotational speed control unit 8 rotates the motor 2 (drum 1) at a rotational speed V for a predetermined time. As the predetermined time, a value of about 10 to 15 seconds is selected. However, if there is a previous rotation in the cleaning process, it is rotated in the opposite direction.

  (Step A3) The frequency component calculation unit 7 acquires acceleration information (vibration information) detected by the vibration detection unit 6 during rotation of the drum 1 in step A2 as time series data, and performs a Fourier transform process. Then, a frequency component of vibration corresponding to the rotation speed of the drum 1 is obtained. That is, when the rotation speed of the drum 1 is Vrpm, a vibration component with respect to the frequency V / 60 Hz is obtained (note that the rotation speed V of the drum 1 is obtained from the rotation speed control unit 8 by the frequency component calculation unit 8). Further, in the present embodiment, the vibration detection unit 6 detects vibration in one direction (left and right direction) of the receiving cylinder 3, but when the vibration detection unit 6 is a triaxial acceleration sensor, frequency component calculation is performed. The unit 7 adds the triaxial acceleration signals, and performs a Fourier transform process on the addition result. By summing the components of the three axes, vibration can be grasped more accurately. In the Fourier transform process, a discrete Fourier transform process (DFT) or a fast Fourier transform process (FFT) is performed by software in the microcomputer constituting the frequency component calculation unit 7 to calculate a Fourier amplitude spectrum and a power spectrum. Alternatively, the calculation may be performed using dedicated calculation hardware such as a DSP.

  (Step A4) The result of the Fourier transform process corresponding to the rotational speed V of the drum 1 is Xv. The rotation speed control unit 8 compares this Xv with a value range A set in advance. The range A means the range [a0, a1] (values of a0, a1 are set in advance). Here, it is determined whether Xv is in the range A, small, or large, and the process is branched as follows.

  When the frequency component Xv is smaller than the range A (Xv <a0): The process proceeds to step A5.

  When the frequency component Xv is larger than the range A (Xv> a1): The process proceeds to step A6.

  When the frequency component Xv falls within the range A (a0 ≦ Xv ≦ a1): The process proceeds to step A7.

  (Step A5) Since the calculated frequency component Xv is small, it is determined that the laundry has not reached the sticking state, and the rotational speed of the drum 1 is increased by dV to obtain V + dV.

  (Step A6) Since the calculated frequency component Xv is large, it is determined that the laundry has reached the sticking state, and the rotational speed Xv of the drum 1 is decreased by dV to obtain V-dV.

  (Step A7) It is determined whether the washing time has ended. If not completed, the process returns to step A2 to repeat the above-described operation. If completed, the process proceeds to the next step (for example, a dehydration step).

  FIG. 6 shows an example of a change in the rotational speed of the drum 1 due to the operations of the above steps A1 to A7. FIG. 6 shows that the rotation speed control unit 8 changes the rotation speed of the drum 1 so that the magnitude of the frequency component calculated by the frequency component calculation unit 7 falls within a predetermined range A. As a result, the state of the laundry becomes a state of washing as shown in FIG. 3A, which is a state immediately before sticking, and the laundry can be washed more effectively. This also has the effect of shortening the washing time.

  In the operation procedure of FIG. 5, the rotational speed control unit 8 may store the frequency component value calculated in step A3. When a new frequency component value is calculated by changing the rotation speed in steps A5 and A6, the stored old frequency component value is compared with the new frequency component value, and if there is no change, the rotation speed is not changed. You may do it. By doing this, for example, when the laundry 1 is stuffed into the drum 1 and the frequency characteristic of the vibration of the drum 1 does not change depending on the rotational speed, the laundry is performed at the rotational speed of the initial value V0. be able to.

  FIG. 7 shows another operation procedure for controlling the rotation speed of the drum 1 (motor 2). In the operation procedure of FIG. 5, the output signal from the vibration detection unit 6 is always subjected to frequency analysis during the washing process, and the rotational speed of the drum 1 is changed based on the result. In FIG. Only to change the rotation speed. Details of the operation procedure will be described in order for each step of FIG.

  (Step B1) At the start of the washing process, the rotation speed of the drum 1 (motor 2) is initialized to V1. In the present embodiment, V1 is the upper limit value of the rotational speed of the drum 1 (motor 2).

  Here, the upper limit value of the rotation speed means an upper limit value of the speed at which the motor 2 can rotate the drum 1 in a state where laundry is put. The rotational speed of the drum 1 is changed within a predetermined range according to the performance of the motor 2 (upper limit value: V1, lower limit value: V2). Here, the upper limit value is the maximum rotation speed at which the motor 2 can rotate the drum 1 in a state where laundry is put. In general, as the rotational speed is lowered, the power consumption of the motor 2 increases and cannot be set to an extremely small value (except when stopped). Therefore, there is also a lower limit value for the rotational speed of the motor 2. These upper limit value V1 and lower limit value V2 are set to appropriate values in consideration of motor performance, power consumption, mechanism, durability, and the like.

  (Step B2) The rotation speed control unit 8 rotates the drum 1 (motor 2) at the rotation speed V for a predetermined time. However, if there is a previous rotation, rotate it in the opposite direction.

  (Step B3) Similarly to step A3, the frequency component calculation unit 7 calculates the frequency component Xv of the vibration with respect to the rotational speed V of the drum 1 from the time series data detected by the vibration detection unit 6.

  (Step B4) The rotation speed control unit 8 compares the frequency component value Xv calculated by the frequency component calculation unit 7 with a predetermined threshold value a2.

  If Xv is smaller than or equal to the threshold value a2, it is determined that the laundry is not stuck to the drum 1 at the current rotational speed V, and the process proceeds to step B7. Continue until is finished.

  If Xv is larger than the threshold value a2, it is determined that the laundry is stuck to the drum 1 at the current rotational speed V, and the process proceeds to step B5.

  (Step B5) The rotational speed control unit 8 checks whether or not the current rotational speed V is greater than the lower limit value V2 of the rotational speed. In some cases, such as when the laundry is packed in the drum 1, the sticking state may not change even if the rotational speed is reduced. In that case, the rotation speed is not set to an extremely small value, but is rotated at a value near the lower limit value V2 of the rotation speed. Here, when the rotational speed is lower than or equal to the lower limit value V2, the process proceeds to Step B7, and the subsequent washing is performed at the rotational speed. If the rotational speed V is greater than V2, the process proceeds to step B6.

  (Step B6) The rotational speed V is decreased by dV, the process returns to Step B2, and the above-described processing is repeated.

  By performing the above operation, for example, the rotation speed can be changed as shown in FIG. FIG. 8 shows that the rotation speed of the drum 1 is changed from a higher value to a lower value until the frequency component value becomes appropriate (below the threshold value) at the start of washing. Keep doing the subsequent washing. With this method, the appropriate rotation speed of the drum 1 can be determined by the rotation speed control unit 8 at the start of washing, and the laundry can be put into a wash-washed state, as in the operation procedure of FIG. Can be realized. In general, when the rotational speed of the drum 1 is low, torque is required for the motor 2 and large power consumption is required. As described above, by changing the rotational speed from the higher one, it is possible to avoid a low rotational speed in the rotational speed determination process, which can contribute to a reduction in power consumption.

  Although the flowchart of FIG. 7 is performed at the beginning of the washing process, it may be performed during the washing process. In some cases, it is more efficient to determine the rotation speed when the laundry is completely absorbed.

  Further, in the flowchart of FIG. 7, the rotation speed of the drum 1 is changed from the upper limit value to the lower limit value, but conversely, it may be changed from the lower limit value to the upper limit value. A flowchart and an operation explanatory diagram in this case are shown in FIGS. 9 and 10, respectively. The flowchart of FIG. 9 is basically the same as the flowchart of FIG. 7, but steps B1 ', B4', B5 ', and B6' are different. In step B1 ', the drum rotation speed V is initialized to the lower limit value V2. In step B4 ', the calculated frequency component value Xv is compared with the threshold value a3, and if it is equal to or larger than a3, the process proceeds to step B7, and thereafter, washing is performed at the rotational speed V. If smaller than a3, the process proceeds to step B5 '. In step B5 ', the rotational speed V is compared with the upper limit value V1, and if the rotational speed V is greater than or equal to the upper limit value V1, the process proceeds to step B7, and then washing is performed at that rotational speed V. When the rotational speed V is smaller than the upper limit value V1, the process proceeds to step B6 ', the rotational speed V is increased by dV, and the process proceeds to step B2. By performing the operation based on the flowchart of FIG. 9, the rotation speed can be changed as shown in FIG. By increasing the rotational speed from the lower one, it is possible to prevent the laundry from sticking to the drum 1 in the process until the rotational speed is determined, and the overall cleaning ability can be improved.

  As described above, the frequency component corresponding to the rotational speed of the drum 1 is obtained from the vibration of the receiving cylinder 3 using any of the operation procedures of FIGS. By changing the rotation speed, the laundry can be prevented from sticking to the drum 1 and can always be swung. Thereby, a cleaning capability can be improved more. Moreover, it can be said that the washing time can be shortened correspondingly because the washing ability is increased.

  In the above-described embodiment, the frequency component with respect to the rotation speed of the drum 1 is obtained from the vibration data obtained from the vibration detection unit 6 using the Fourier transform process. However, in general, the rotational speed of the drum 1 varies due to variations and often does not always become a completely constant rotational speed. Therefore, as shown in FIG. 4B, the frequency component calculation unit 7 performs a predetermined range of frequencies (frequency range including fluctuations in the drum rotation speed) centered on the frequency corresponding to the rotation speed of the drum 1. Alternatively, the vibration frequency components may be calculated, and the maximum or average value of the frequency components within the predetermined range may be output as the frequency component corresponding to the rotational speed of the drum. Thereby, even if the rotational speed of the drum 1 varies, it becomes possible to prevent the laundry from sticking as described above.

  As described above, the washing machine, the drum rotation speed control method, and the program according to the present invention can control the rotation speed of the drum from the frequency component of the receiving barrel vibration, thereby improving the washing ability of the washing machine. This can be widely applied not only to a home-use washing machine but also to a washing / drying machine and a commercial washing machine.

Configuration diagram of washing machine according to Embodiment 1 of the present invention (A) Explanatory drawing of the grooving state showing the operating principle of the washing machine (b) Graph showing the same frequency characteristics (A) Explanatory drawing of the washing state showing the operating principle of the washing machine (b) Graph showing the frequency characteristics (A) Explanatory drawing of the sticking state showing the operating principle of the washing machine (b) Graph showing the frequency characteristics Flow chart showing operation of the washing machine Explanatory drawing of rotation speed change of the washing machine Flow chart of another example showing the operation of the washing machine Explanatory drawing of another example of rotational speed change of the washing machine Flow chart of another example showing the operation of the washing machine Explanatory drawing of another example of rotational speed change of the washing machine The figure which shows the structure of the conventional washing machine

Explanation of symbols

1 Drum 2 Motor 3 Cylinder 4a Spring (elastic support mechanism)
4b Damper (elastic support mechanism)
5 Housing 6 Vibration detector 7 Frequency component calculator 8 Rotational speed controller

Claims (8)

A drum that accommodates and rotates laundry, a receiving cylinder that accommodates the drum and is supported by an elastic support mechanism from a housing, a motor that rotates the drum, and vibration detection that detects vibration of the receiving cylinder A laundry component, a frequency component calculation unit that calculates a frequency component with respect to the vibration detected by the vibration detection unit, and a rotation speed control unit that changes the rotation speed of the motor according to the magnitude of the frequency component Machine. The vibration detection unit is composed of at least one acceleration sensor, detects at least one vibration component in the vertical, horizontal, front-rear, etc. direction of the cylinder, and determines the acceleration in each direction or the sum of the accelerations in the directions. The washing machine according to claim 1, wherein The frequency component calculation unit calculates a frequency component of vibration at a frequency corresponding to the rotation speed of the drum, and the rotation speed control unit increases the rotation speed of the motor when the frequency component is smaller than a predetermined range value, The washing machine according to claim 1 or 2, wherein when the frequency component is larger than a value in a predetermined range, the rotational speed of the motor is decreased. The frequency component calculation unit calculates a frequency component of vibration at a frequency corresponding to the rotation speed of the drum, and the rotation speed control unit changes the rotation speed of the drum from an upper limit value to a lower limit value, while the frequency component calculation unit The washing machine according to claim 1 or 2, wherein the frequency component value is obtained by the method, and the subsequent washing is continued at a rotation speed when the frequency component value becomes a predetermined value or less. The frequency component calculation unit calculates a frequency component of vibration at a frequency corresponding to the rotation speed of the drum, and the rotation speed control unit changes the rotation speed of the drum from a lower limit value to an upper limit value, while the frequency component calculation unit The washing machine according to claim 1 or 2, wherein the frequency component value is obtained by the method, and the subsequent washing is continued at a rotational speed when the frequency component value becomes a predetermined value or more. The frequency component calculation unit calculates the frequency component of vibration for each frequency within a predetermined range corresponding to the fluctuation range of the drum rotation speed, and calculates the maximum or average value of the frequency component within the range as the drum rotation. The washing machine according to any one of claims 3 to 5, which outputs a frequency component value corresponding to a speed. A drum rotation speed of a washing machine, comprising: detecting vibration of a receiving cylinder; calculating a frequency component with respect to the vibration; and changing a rotation speed of a motor according to the magnitude of the frequency component Control method. The program for making a computer implement | achieve at least one part of the washing machine of Claims 1-6.