JP2012000353A - Clothes treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the vibration and noise of a casing by controlling the driving of a washing motor.SOLUTION: A clothes treatment apparatus includes a casing 1, a rotary drum 3 provided in the casing 1 for containing clothes or the like, an induction motor 12 for driving the rotary drum 3, and a control section 13 for supplying variable-frequency power to the induction motor 12 to drive the induction motor 12. The control section 13 performs the control by preventing the variable frequency or its harmonics from coinciding with the resonance frequency of the casing 1 and by setting a driving frequency so as to maximize the efficiency of the induction motor 12 at a frequency other than the resonance frequency. Thus, the vibration and noise of the casing can be suppressed.

Description

  The present invention relates to a clothing processing apparatus that performs laundry washing and the like.

  Conventionally, it has been considered that this type of clothing processing apparatus can efficiently perform washing while reducing vibration and noise during dehydration operation (see, for example, Patent Document 1). FIG. 5 is a block circuit diagram showing an example of a drive control system of a DC brushless motor of a washing machine described in Patent Document 1.

  As shown in FIG. 5, the vibration detection sensor (A) 24 and the vibration detection sensor (B) 25 are provided in the outer tub of the drum type washing machine to detect the vibration amplitude value. If the vibration amplitude value is equal to or less than a predetermined value, dehydration is performed. Shift to rotation, and if it exceeds the predetermined value, the rotation by the balance rotation control is continued at a low speed. Further, in the dewatering rotation, the speed of the washing drum increases as the dewatering time elapses. At that time, there is a primary resonance point and a secondary resonance point at which the washing drum vibrates greatly. The vibration frequency of the primary resonance point and the secondary resonance point is determined by the natural vibration frequency of the outer tank and the outer frame.

  The vibration at the secondary resonance point is detected and calculated by the vibration detection sensor (A) 24 and the vibration detection sensor (B) 25. When it is determined that the vibration is lower than the prescribed value of vibration for high speed rotation, high speed rotation is performed. When it is determined that the vibration is larger than a predetermined vibration value for high-speed rotation and equal to or less than a predetermined value for vibration for medium-speed rotation, medium-speed rotation is performed. If the vibration is larger than the default vibration value for medium speed rotation, low speed rotation is performed.

  In this way, unbalanced vibration detection is performed, and the process shifts to dehydration rotation. Further, vibration at the secondary resonance point is further detected to select high speed, medium speed, or low speed, and dehydration rotation control is performed. Is.

JP 2008-61856 A

  However, in the conventional configuration, when the vibration amplitude detected by the vibration detection sensor is greater than or equal to the predetermined value, the operation at the low speed rotation is continued, so the transition from the washing to the dehydration process is delayed, and the operation of the washing dryer There was a problem that the time was increased, and the operation time and power consumption increased.

  Further, in the above-described conventional configuration, when the laundry or the like is biased in the drum, imbalance occurs, and the operation is limited when the vibration amplitude exceeds a predetermined value. It is not intended to limit vibration and noise to the fuselage, and in general, in order to prevent vibration and noise, cushioning materials etc. are often provided on the outer wall of the housing, etc. so as not to leak outside, There were challenges in solving economics and noise and vibration.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a clothing processing apparatus that controls driving of a washing motor and suppresses vibration and noise of the casing.

  In order to solve the above-described conventional problems, a clothing processing apparatus according to the present invention includes a housing, a rotating drum that accommodates clothing or the like provided in the housing, an induction motor that drives the rotating drum, and the induction motor. And a control unit that drives by supplying variable frequency power to the control unit, wherein the control unit avoids the resonance frequency of the housing with the variable frequency or its harmonics, and the induction motor is at a maximum other than the avoided frequency. The control is performed at a driving frequency that is efficient.

  As a result, the drive frequency of the induction motor that drives the rotating drum is operated at a frequency that does not overlap with the vibration frequency of the case and its harmonics, thereby suppressing the vibration and noise of the case to a minimum. In addition to being able to operate the induction motor with maximum efficiency, it is possible to provide an energy-saving, low noise, low vibration clothing processing apparatus.

  The clothing processing apparatus according to the present invention can suppress the vibration and noise of the housing by avoiding the vibration frequency of the housing as the driving frequency of the motor, and can operate with the maximum efficiency of the motor except in the suppressed state.

Configuration diagram of a clothing processing apparatus according to Embodiment 1 of the present invention. Block diagram of the control unit of the clothing processing apparatus The flowchart which shows operation | movement of the control part of the clothing processing apparatus. Relationship diagram between rotation speed and applied voltage of the clothing processing equipment Block diagram of a conventional washing machine

  The first invention includes a housing, a rotating drum that accommodates clothing or the like provided in the housing, an induction motor that drives the rotating drum, and a control that drives the induction motor by supplying variable frequency power. The variable frequency of the control unit and its harmonics avoid the resonance frequency of the housing, and other than the resonance frequency, the induction motor is controlled at the drive frequency at which maximum efficiency is achieved. In addition to operating the induction motor with maximum efficiency, vibration and noise can be suppressed.

  In the second invention, in particular, the control unit of the first invention includes a voltage setting means for setting an applied voltage to the induction motor, a driving frequency setting means for setting a driving frequency, and an actual rotational frequency of the rotating drum. It has slip frequency setting means for setting a difference frequency with the drive frequency setting means, and the drive frequency of the control unit and its harmonics avoid the resonance frequency of the casing, and the induction motor has the maximum efficiency other than the resonance frequency. By adjusting the applied voltage of the voltage setting means and the slip frequency of the slip frequency setting means to calculate the slip frequency, the desired drum rotation speed can be maintained with a simple configuration, and the driving frequency that causes vibration and noise In the operation other than the resonance frequency of the housing, the maximum efficiency of the induction motor can be realized.

  In particular, the third invention sets the applied voltage of the voltage setting means of the second invention to be smaller than the desired voltage, sets the slip frequency of the slip frequency setting means to be larger than the desired frequency, and sets the drive frequency of the control unit and its harmonics to By shifting to the high frequency side from the resonance frequency of the housing, the drive frequency can be shifted to the high frequency side and the rotation speed of the rotating drum can be set to the target rotation speed, avoiding resonance points of vibration and noise of the housing. be able to. Even when the applied voltage is lowered, the energy saving effect can be enhanced by setting the slip frequency value for reducing the current value.

According to a fourth aspect of the invention, in particular, the control unit of any one of the first to third aspects has carrier frequency setting means for setting a carrier signal of the inverter circuit, and the carrier frequency of the carrier frequency setting means and its carrier frequency By setting the harmonics to a carrier frequency that does not overlap with the resonance frequency of the casing, vibration and noise of the casing due to the carrier frequency can be suppressed.

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

(Embodiment 1)
FIG. 1 is a configuration diagram of a washing / drying machine as a clothing processing apparatus that performs washing, rinsing, dehydration, and drying in the first embodiment of the present invention, and FIG. 2 is a block diagram of a control unit of the washing / drying machine. Is shown.

  1 and 2, a rotating drum 3 that accommodates and rotates laundry such as clothes, an induction motor 12 that drives the rotating drum 3, a motor pulley 5 attached to a motor shaft of the induction motor 12, and a belt 6 The power is transmitted to the drum pulley 4 attached to the rotating shaft of the rotating drum 3 via the shaft, and the rotating drum 3 is rotationally driven. The rotary drum 3 is rotatably provided in a receiving cylinder 8 that is elastically supported by a damper 7, and these are provided in a housing 1 of the washing / drying machine.

  The induction motor 12 is configured to operate according to a command of a drive signal 16 from the control unit 13, and to detect the rotation speed at the time of the rotation operation by the rotation speed detection unit 15. The induction motor 12 is a three-phase induction motor, which is a two-pole (number of pole pairs = 1) motor that operates at a high speed of 10,000 revolutions per minute, but may be four poles (number of pole pairs = 2). Further, during the drying operation, the drying fan 2 is driven by the fan motor 11 so that the blown air is sent into the rotary drum 3.

  The control unit 13 takes in the recording means 131 that records the resonance frequency of the casing 1 of the washing / drying machine in advance and the speed of the induction motor 12 detected by the speed detection unit 15 and performs speed control. 132, a slip frequency setting means 133 for setting a slip frequency according to a command from the speed control unit 132, a drive frequency setting means 135 for determining a drive frequency command value to the induction motor 12 from the slip frequency setting value, and an applied voltage value Voltage setting means 134 for determining the voltage, a vector converter 136 for calculating a command value for the inverter 137 from the command value, an inverter 137, and a current detection means 138 for detecting an operating current from the inverter 137 to the induction motor 12. Consists of.

  The inverter 137 includes a frequency generator 137A of a signal frequency generator to be driven, a drive circuit 137B, and carrier frequency setting means 137C for setting a carrier frequency. The inverter 137 is an inverter module containing a general three-phase six-stone IGBT, a drive circuit, and the like. The inverter 137 receives each three-phase voltage command signal and uses a triangular carrier wave having a frequency of the carrier frequency setting means 137C. Width modulation (PWM) shall be used.

  FIG. 3 shows the relationship between the actual rotational speed, the command rotational speed, and the applied voltage. The horizontal axis represents the number of rotations (r / min) of the rotary drum 3, and the vertical axis represents the voltage applied to the induction motor 12.

  First, the curve C1 of the rotation speed of the induction motor 12 at the slip frequency B1 set by the slip frequency setting means 133-motor applied voltage is shown, and the command value V1 (160V) of the voltage setting means 134 at that time is used to drive at that time. When the command value rotation speed A2 of the frequency setting means 135 is used, the actual rotation speed A1 of the rotary drum 3 is shown.

  Further, a curve C2 of the rotational speed of the induction motor 12 at the slip frequency B2 set by the slip frequency setting means 133-motor applied voltage C2 is shown, and the command value V2 (140 V) of the voltage setting means 134 at that time and the drive frequency setting means When the command value rotational speed A3 is 135, the actual rotational speed A1 of the rotary drum 3 is shown.

  The operation and action of the washing / drying machine configured as described above will be described below. First, when the washing / drying machine shown in FIG. 1 performs washing, rinsing, dehydration, and drying processes, the control unit 13 responds to the rotational speed and load torque of the rotating drum 3 according to the operation of each process. Then, the slip frequency at which the induction motor 12 has the maximum efficiency is calculated by the slip frequency setting means 133. Further, from the slip frequency value, the drive frequency and the voltage setting means 134 calculate the drive frequency and the applied voltage by the drive frequency setting means 135. Control is performed by inputting the signal 16 to the induction motor 12.

  Here, regarding the calculation of the slip frequency that is the maximum efficiency set by the slip frequency setting means 133, for example, as the vector control, the current detection means 138 detects the supply current to the induction motor 12, and the current value is minimized. The slip frequency condition to be calculated is divided into a magnetic flux current (magnetization current) component and a current component (torque current) orthogonal to the magnetic flux current (magnetization current) component.

  For example, when the torque command value T *, the magnetic flux command value φ2 *, the mutual inductance M of the induction motor 12, the inductance L2 of the induction motor 12, the secondary resistance r2, and the number of pole pairs p are known data of the induction motor 12 in advance. As described above, the slip frequency setting means 133 holds the magnetic flux command value φ2 *, which is the maximum efficiency under the combination conditions of the desired rotational speed and torque, under a plurality of conditions.

  In the drive frequency setting flowchart of the control unit 13 shown in FIG. 4, the magnetic flux command value and the torque command value are calculated from the actual rotational speed (S01) during actual operation and the current value (S02) of the motor current at that time ( S03), according to the command value, the magnetic flux current iγ is iγ = φ2 * / M + L2 / (M × r2) × dφ2 * / dt, and the torque current iδ is iδ = L2 × T * / (p × M × φ2 *). Further, the slip frequency Ws can be obtained as Ws = M × r2 / (L2 × φ2 *) × iδ (S04).

  The drive frequency set by the drive frequency setting means 135 and the voltage set by the voltage setting means 134 are set from the slip frequency calculated in this way (S05). In the drive frequency setting means 135, the set drive frequency matches the resonance frequency. (S06), if they match, the slip frequency setting means 133 calculates again from the calculation formula so that the drive frequency is a constant value and a high frequency range (S07), and again the drive frequency setting means The drive frequency 135 is changed and set.

  If the resonance frequency does not coincide with the resonance frequency, the induction motor 12 is operated at the maximum efficiency with the drive frequency set by the drive frequency setting means 135 and the voltage set by the voltage setting means 134 (S08).

  Therefore, after the slip frequency is calculated, the drive frequency is shifted to a constant value and a high frequency range only when the resonance frequency and the drive frequency coincide with each other, and the efficiency of the induction motor 12 is not maximized. By changing to the magnetic flux command value according to the combination condition of the necessary torque and recalculating the slip frequency, the torque control can be performed smoothly and stably even near the resonance frequency.

  The drive frequency and applied voltage of the induction motor 12 are set from the rotational value of the number-of-times detecting unit 15 taking into consideration the reduction ratio between the motor pulley 5 and the drum pulley 4 of the induction motor 12 that is known in advance. As a result, by controlling the speed and torque of the induction motor 12 in consideration of the reduction ratio, the rotational speed and torque of the rotating drum 3 can be set to desired values.

For example, when the reduction ratio of the motor pulley 5 and the drum pulley 4 is 8, when the detection value of the rotation speed detector 15 is 400 r / min, the rotation speed of the rotation drum 3 is 50 r / min, and the load torque of the rotation drum 3 is In the case of 16 Nm, the load torque of the induction motor 12 is 2 Nm, and the induction motor 12 performs speed and torque control at a rotational speed of 400 r / min and a load torque of 2 Nm.

  When shifting from the washing process to the dehydration process, the rotational speed of the rotating drum 3 is slowly increased from the stopped state, and the rotation is shifted to high speed rotation. Also at that time, the control unit 13 calculates and operates the drive frequency and applied voltage at which the induction motor 12 has the maximum efficiency. When there are a plurality of resonance frequencies of the housing 1 before reaching the desired number of rotations of the dehydration operation, the resonance frequency is checked against the value of the recording means 131 that has been recorded in advance, and driven to a frequency that avoids that value. The speed control unit 132 controls the induction motor 12 by setting the drive frequency of the frequency setting means 135. In that case, priority is given to the frequency and voltage value that avoids the resonance frequency over the condition of the maximum efficiency of the motor.

  The speed control unit 132 detects the rotational speed of the induction motor 12 from the rotational speed detection unit 15 and converts the actual rotational speed of the rotary drum 3. Further, the operating current from the inverter 137 to the induction motor 12 is detected by the current detecting means 138, and the necessary secondary magnetic flux and torque current are calculated from the current value and the actual rotational speed of the rotating drum 3 converted from the rotational speed detecting section 15. The slip frequency command value is calculated and set by the slip frequency setting means 133. As a result, stable operation and excessive power consumption can be suppressed by calculating the necessary torque and the current value of the slip frequency to be supplied according to the operating conditions and performing control.

  Further, the magnetic flux current and the torque current value are calculated from the set slip frequency value, and the vector sum of the magnetic flux current and the torque current becomes the supply current to the induction motor 12, so that the voltage setting means is set so as to be the supply current value. At 134, the voltage value is calculated. Further, the drive frequency set from the slip frequency value and the actual rotation value is set by the drive frequency setting means 135, and the vector converter 136 calculates the two-phase to three-phase conversion and the frequency and applied voltage supplied to the inverter 137. .

  The inverter 137 generates a three-phase drive signal from the drive frequency and applied voltage calculated by the vector converter 136 by the frequency generator 137A, and generates a triangular carrier wave at the frequency (for example, 15 kHz) set by the carrier frequency setting means 137C. The used pulse width modulation (PWM) is generated, and the signal is input to a drive circuit 137B which is an inverter module containing a 3-phase 6-stone IGBT and a drive circuit.

  By the applied voltage from the inverter 137, the induction motor 12 operates at a desired rotational speed and torque. As a result, the rotating drum 3 is rotated by the motor pulley 5 and the drum pulley 4 on the shaft of the induction motor 12 via the belt 6.

  Therefore, when the rotational speed is gradually increased in the dehydration step, if the resonance frequency of the case 1 of the washing / drying machine preset in the recording unit 131 is reached, the value of the slip frequency setting unit 133 is set to a desired value. By setting the frequency higher, the frequency of the drive frequency setting means 135 is set higher than the desired value, and the voltage value of the voltage setting means 134 is set lower than the desired value, so that the rotational speed of the rotary drum 3 is set to the desired value. At the same time, the drive frequency can be shifted to the high frequency side while avoiding the resonance frequency of the housing 1.

  In this case as well, since the slip frequency value and voltage value for giving priority to avoiding the resonance frequency are selected, the efficiency of the motor is not maximized. However, at a frequency other than the resonance frequency, an operation is performed by selecting a slip frequency and a voltage value that are the maximum efficiency of the motor.

The slip frequency Ws is the difference between the set frequency W2 and the actual rotational frequency Wm (Ws = W2−Wm).
As shown in FIG. 3, for example, when the actual rotational speed A1 of the rotating drum 3 is set, the command value of the slip frequency setting means 133 is set to the command value in the case of the operation curve C1 of the applied voltage and the actual rotational speed curve. Assuming B1, the command value of the voltage setting means 134 is calculated as the voltage V1 (160V) and the command value of the drive frequency setting means 135 is calculated as the rotation speed A2, and the induction motor 12 operates.

  Next, in the case of the applied voltage with the actual rotational speed A1 of the same rotating drum 3 and the operation curve C2 of the actual rotational speed curve, if the command value of the slip frequency setting means 133 is the command value B2, the command of the voltage setting means 134 The value is the voltage V2 (140V) and the command value of the drive frequency setting means 135 is calculated as the rotation speed A3, and the induction motor 12 operates.

  By changing the slip frequency in this way, the applied voltage can be lowered and the drive frequency can be shifted from A2 to A3 to the high frequency side, so that control to avoid the resonance frequency of the casing 1 of the washing / drying machine can be performed. . That is, by changing the slip frequency, the voltage applied to the induction motor 12 and the drive frequency can be changed, the rotating drum 3 can be operated at a desired rotational speed, and the resonance frequency of the housing 1 can be avoided. By operating these in accordance with the frequency recorded in advance by the recording means 131, vibrations and noises of the casing 1 of the washer / dryer can be suppressed.

  Furthermore, since the current value to the induction motor 12 can be reduced by shifting the drive frequency to the high frequency side and lowering the applied voltage, the efficiency can be improved and control with energy saving performance maintained.

  In the present embodiment, so-called vector control is performed in which the current supplied to the induction motor 12 is controlled by dividing the current into magnetic flux current and torque current. As a result of the vector control being performed, the case 1 The resonance frequency is avoided, and values other than the resonance frequency can take values that enable the induction motor 12 to achieve the maximum efficiency.

  Therefore, particularly in this embodiment, by performing vector control, it is possible to cope with transient load fluctuations with excellent responsiveness, and there is an effect that an excellent washing performance can be obtained. It is not always necessary to configure the vector control for controlling the magnetic flux current and the torque current with respect to the current of the induction motor 12, but the slip frequency is determined so as to avoid the resonance frequency of the casing 1, and the voltage setting means 134 A voltage that can ensure an appropriate torque at the slip frequency is output, and a condition that can achieve the maximum efficiency of the induction motor 12 other than the resonance frequency of the housing 1 is output from the slip frequency setting means 133 and the voltage setting means 134. For example, the VF method may be used as long as it can be used.

  Here, the carrier frequency of the carrier frequency setting means 137C is 15 kHz, but any other frequency may be used as long as the frequency is equivalent.

  Further, when the frequency recorded in the recording means 131 matches the carrier frequency value of the carrier frequency setting means 137C or its harmonic, the value of the carrier frequency setting means 137C is changed to another frequency and the inverter 137 is driven. By changing the carrier frequency value in this way, vibration can be avoided even when the resonance frequency of the casing 1 of the washing / drying machine matches the carrier frequency, and stable operation and noise suppression can be achieved.

Although the induction motor 12 which is a main motor for washing is described here, the drying fan motor 11 is also provided with a control unit for driving the drying fan motor. There is a possibility that the driving frequency for driving the fan motor in the section matches the resonance frequency of the case 1 of the washing / drying machine. Even in this case, vibration and noise can be prevented by the same method as the present invention. it can.

  Although the drum type washing and drying machine has been described here, the driving frequency is similarly applied to the drum type washing machine and the clothing processing apparatus such as the vertical washing machine and the vertical washing and drying machine and the drum drying machine. The vibration and noise due to the resonance frequency of the housing can be suppressed, and the same effect, function and performance can be obtained.

  As described above, the garment processing apparatus according to the present invention suppresses the vibration and noise of the housing while avoiding the vibration frequency of the housing as the motor driving frequency, and operates with the maximum efficiency of the motor except in the suppressed state. Therefore, it is useful as a clothing processing apparatus.

DESCRIPTION OF SYMBOLS 1 Case 3 Rotating drum 12 Induction motor 13 Control part 133 Sliding frequency setting means 134 Voltage setting means 135 Driving frequency setting means

Claims (4)

A housing, a rotating drum that houses clothing or the like provided in the housing, an induction motor that drives the rotating drum, and a controller that drives the induction motor by supplying variable frequency power, The control unit is a garment processing apparatus in which a variable frequency or a harmonic thereof avoids a resonance frequency of the casing, and controls the induction motor at a driving frequency at which the induction motor has a maximum efficiency except for the avoided frequency. The control unit includes a voltage setting unit that sets an applied voltage to the induction motor, a driving frequency setting unit that sets a driving frequency, and a slip that sets a differential frequency between the actual rotation frequency of the rotating drum and the driving frequency setting unit. 2. A clothing processing apparatus according to claim 1, further comprising a frequency setting means, wherein the applied voltage of the voltage setting means and the slip frequency of the slip frequency setting means are adjusted so that the induction motor has a maximum efficiency other than the resonance frequency of the housing. . The applied voltage of the voltage setting means is set to be smaller than the desired voltage, the slip frequency of the slip frequency setting means is set to be higher than the desired frequency, and the drive frequency of the control unit and its harmonics are shifted to the higher frequency side than the resonance frequency of the housing. The clothing processing apparatus according to claim 2. The control unit has carrier frequency setting means for setting a carrier signal of the inverter circuit, and the carrier frequency of the carrier frequency setting means and its harmonics are carrier frequencies that do not overlap with the resonance frequency of the housing. 4. The clothing processing apparatus according to any one of 3 above.

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