JP2008054811A - Motor driving device for washing-drying machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control an AC input current by simultaneously driving a plurality of motors, and operating the motor currents. <P>SOLUTION: A rotary drum driving motor (first motor) 6A which drives a rotary drum 7 and a heat pump compressor motor (second motor) 6B which feeds warm air into the rotary drum 7 are controlled by a first current detecting means or a second current detecting means which detects the motor current and a controlling means 5. In this case, the rotary drum driving motor (first motor) 6A drives the rotary drum 7 by converting the AC power of an AC power source 1 into a DC power by a rectification circuit 2, and converting the DC power into the AC power by a first inverter circuit 3A and a second inverter circuit 3B. The controlling means 5 can acquire the motor power by the operation, and therefore, can control the AC input current without an AC input current detecting means via the first inverter circuit 3A and the second inverter circuit 3B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor driving device for a heat pump type washing and drying machine that simultaneously drives a plurality of motors by a plurality of inverter circuits.

Conventionally, a motor driving device of this type of washing and drying machine includes a heat pump type dehumidifying dryer, and the rotary drum and the compressor for the heat pump are driven to rotate by an inverter circuit and a motor, respectively (for example, see Patent Document 1).
JP 2006-116066 A

  However, such a conventional motor driving device for a washing and drying machine includes an inverter circuit that drives a first motor that rotationally drives a rotary drum, and an inverter circuit that drives a second motor that rotationally drives a compressor for a heat pump. AC power supply or DC power supply is shared, so the AC power supply current increases and exceeds the outlet capacity in the operation state of the compressor motor or in the dehydration drying operation process in which the dehydration operation and the heat pump drying operation are performed simultaneously. There was a problem. A method to measure the AC power supply current with a current sensor so that the AC power supply current does not exceed the outlet capacity upper limit has been proposed, but the circuit is complicated and expensive, and if the DC power supply is shared, the individual input of the motor is unknown Therefore, there is a problem that the control becomes complicated.

  The present invention solves the above-mentioned conventional problems, and detects the input of the compressor motor by calculating the input of the compressor motor for heat pump or the output power from the motor current, and the AC power supply current is the outlet capacity upper limit value. It controls so that it may become the following.

  Furthermore, the total input power of the washer / dryer can be calculated by estimating the input or output power of the drum motor and compressor motor during the dehydrating / drying operation, which is the maximum power consumption of the washer / dryer, from the respective motor currents. The estimation calculation is performed so that the AC power supply current is controlled to be equal to or less than the outlet capacity upper limit value.

  In order to solve the above-described conventional problems, the motor driving device for a washing and drying machine according to the present invention converts AC power of an AC power source into DC power using a rectifier circuit, and converts DC power into AC power using first and second inverter circuits. The control means controls the first motor that drives the rotating drum by the first inverter circuit, and the second motor that drives the compressor of the heat pump heat exchanger by the second inverter circuit. The AC input current is controlled by controlling and estimating the input or output power of the first or second motor and controlling the first or second motor.

  Thereby, the abnormal input of the AC power supply current of the washing / drying machine can be prevented by detecting the overload or abnormal input of the compressor motor and controlling the motor rotation speed. Furthermore, since the total input current of the washing / drying machine can be estimated and calculated by estimating and calculating the motor input or output power of each of the rotary drum motor and the compressor motor, the AC power supply current is controlled to be a predetermined value or less. Can do.

  The motor driving device of the washing and drying machine of the present invention can eliminate the AC power supply current detection means, so the number of parts can be reduced, and overload of the rotary drum motor or the compressor motor can be prevented. An inexpensive and highly reliable washing and drying machine can be realized.

  According to a first aspect of the present invention, there is provided a rectifier circuit that converts AC power of an AC power source into DC power, first and second inverter circuits that convert DC power of the rectifier circuit into AC power, and the first and second First and second current detection means connected to the inverter circuit, and control means for controlling the first and second inverter circuits, the control means is a washing and drying machine by the first inverter circuit A first motor that drives a rotating drum is driven, and a second motor that drives a compressor of a heat pump heat exchanger that blows warm air into the rotating drum by the second inverter circuit. The first or second motor is controlled by estimating and calculating the input power or output power of the first or second motor, and the AC input current is controlled. This is a dryer motor drive device, which can detect an overload of a rotating drum motor or compressor motor without AC power supply current detection means, and controls the AC power supply current to be less than or equal to the outlet capacity upper limit. Is.

  Furthermore, the total input power of the washer / dryer can be calculated by estimating the input or output power of the drum motor and compressor motor during the dehydrating / drying operation, which is the maximum power consumption of the washer / dryer, from the respective motor currents. Optimum control can be performed so that the AC power supply current is less than or equal to the upper limit of the outlet capacity by performing the estimation calculation.

  According to a second aspect of the present invention, the motor driving device for the washing / drying machine according to the first aspect of the present invention includes a DC voltage detecting means for detecting a DC voltage of a rectifier circuit that converts AC power into DC power, and drives the rotating drum. The AC input current is controlled by the input or output power of the motor or the second motor for driving the compressor of the heat pump heat exchanger and the output signal of the DC voltage detecting means, and the inverter By detecting a change in the AC power supply voltage from the DC voltage of the circuit, it is possible to improve the estimation calculation accuracy of the AC power supply current.

  According to a third aspect of the present invention, there is provided a motor drive device for a washing / drying machine according to the first aspect of the present invention, wherein the second inverter circuit that performs sensorless driving of the second motor that drives the compressor of the heat pump heat exchanger; A current detection means for detecting a motor current; and a control means for estimating and calculating the input power or output power of the second motor from the motor current detected by the current detection means. In addition to sensorless driving of the motor by the current detection means for detecting the motor, it is possible to detect the motor input or output power, and therefore it is possible to prevent abnormal input of the AC power supply current by the inexpensive power detection means.

  According to a fourth aspect of the present invention, the motor driving device for the washing / drying machine according to the third aspect of the present invention estimates and calculates the torque of the second motor that drives the compressor by the current detection means, and calculates the torque from the estimated calculation torque and the motor rotational speed. The input power or output power of the second motor is estimated and calculated, and the estimation calculation of the motor output power becomes easy and accurate, and an overload or an abnormal increase in AC power supply current can be prevented.

  According to a fifth aspect of the invention, the motor driving device for the washing and drying machine according to the third aspect of the invention calculates and estimates the effective current of the second motor that drives the compressor by the current detection means, and calculates the effective current and the motor applied voltage from the effective current and the motor applied voltage. The input power or output power of the second motor is estimated and calculated, the motor input power estimation calculation becomes easy and accurate, and an overload or an abnormal increase in AC power supply current can be prevented.

  According to a sixth aspect of the present invention, the motor driving device for the washing and drying machine according to the third aspect of the present invention estimates and calculates the input power or the output power of the second motor that drives the compressor by the current detection means, and the input power or The second motor rotation speed is controlled so that the output power is less than or equal to a predetermined value. By controlling the motor rotation speed, an overload or an abnormal increase in the AC power supply current can be prevented. .

  According to a seventh aspect of the invention, the motor driving device for the washing and drying machine in the first aspect drives the first inverter circuit that drives the first motor that drives the rotating drum, and the compressor of the heat pump heat exchanger. A second inverter circuit for sensorlessly driving the second motor; a first current detecting means for detecting the first motor current; a second current detecting means for detecting the second motor current; Means for estimating and calculating input power or output power of the first motor by the first current detecting means, and estimating input power or output power of the second motor by the second current detecting means. The AC input current is controlled based on the total power of the first motor and the second motor, and the total power of the rotary drum drive motor and the compressor drive motor is detected and exchanged. Estimating and calculating the power supply current, the estimation calculation accuracy is high, and even if the rotary drum drive motor or the compressor drive motor has a high output, the AC power supply current detection means can be omitted, and it is an inexpensive and highly reliable washing and drying motor. A drive device can be realized.

  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 block diagram of a motor driving device of a washing / drying machine according to a first embodiment of the present invention, which is a heat pump type dehumidifying / drying type washing / drying machine.

  In FIG. 1, AC power is applied to a rectifier circuit 2 composed of a full-wave rectifier circuit 20 and an electrolytic capacitor 21 from an AC power source 1 and converted into DC power, and a first inverter circuit 3A, a second inverter circuit 3B, The third inverter circuit 3C, the first current detecting means 4A for detecting the output current of each inverter circuit, the second current detecting means 4B, the third current detecting means 4C, and the controller 5 The electric power is converted into three-phase AC power, and the rotary drum drive motor (first motor) 6A, the heat pump compressor motor (second motor) 6B, and the blower fan motor 6C are driven. The first inverter circuit 3A drives the rotary drum drive motor 6A to rotate the rotary drum 7, and the second inverter circuit 3B drives the compressor motor 6B to integrate the compressor motor 6B with the refrigerant compressor. A refrigerant is sent from the condenser 8 to the evaporator 9 (not shown) to exchange heat, and the third inverter circuit 3C rotationally drives the blower fan 10 directly connected to the blower fan motor 6C. Warm air is blown into 7 to dry the clothes in the rotating drum 7. The high-temperature and high-humidity exhaust air from the rotating drum 7 is dehumidified by the evaporator 9 and returned to the intake side of the blower fan 10.

  The control means 5 comprises an inverter control means 50 and a DC voltage detection means 51, and is a three-shunt type connected to the position signal from the rotor position detection means 60a of the rotary drum drive motor 6A and the inverter circuits 3A, 3B, 3C, respectively. The inverter circuits 3A, 3B, and 3C are controlled by current signals from the current detection means 4A, 4B, and 4C, respectively, and the rotary drum drive motor 6A, the heat pump compressor motor 6B, and the blower fan motor 6C are driven and controlled. The DC voltage detection means 51 detects the output voltage of the rectifier circuit 2, that is, the DC voltage Vdc of the inverter circuits 3A, 3B, and 3C. In addition to changing the motor PWM control according to the DC voltage, the motor input or output It is also used when estimating the AC input current from the power.

  The rotary drum drive motor 6A, the heat pump compressor motor 6B, and the blower fan motor 6C are each composed of a permanent magnet synchronous motor. The position detection means 60a for detecting the rotor position of the rotary drum drive motor 6A outputs a rotor position signal for each electrical angle of 60 degrees corresponding to the rotor magnetic pole position, and the rotary drum drive motor 6A is synchronized with the rotor position signal. Sine wave driven. Further, torque control is performed by detecting a torque current based on a signal from the current detection means 4A, or unbalance control by load state detection is performed. On the other hand, the heat pump compressor motor 6B and the blower fan motor 6C have no rotor position detection means, and are position sensorless sine wave drive controlled by signals from the current detection means 4B and 4C.

  The inverter control means 50 is a microcomputer or a digital signal processor incorporating a plurality of PWM control means (not shown) and high-speed A / D conversion means (not shown) for PWM control of the inverter circuits 3A, 3B and 3C. It is composed of a high-speed processor such as a DSP (abbreviated as DSP) and controls the inverter circuits 3A, 3B, 3C at the same time. The rotary drum drive motor 6A, the compressor motor 6B, and the blower fan motor 6C have different rotational speeds. Control.

  The first inverter circuit 3A performs vector control of the rotary drum drive motor 6A, detects the position of the rotor permanent magnet by the position detection means 60a, and the motor of the rotary drum drive motor 6A by the first current detection means 4A. The current is detected and coordinate-transformed into a vector in the q-axis direction perpendicular to the d-axis direction of the rotor permanent magnet (dq conversion), and the rotary drum drive motor 6A is vector-controlled. Further, when the rotary drum drive motor 6A is a surface magnet motor, it is also possible to obtain and control the current value by calculation by open loop vector control without detecting current. The torque current Iq and the d-axis current Id can be obtained instantaneously by vector control of the rotary drum drive motor 6A or by vector calculation of the motor current, so that the instantaneous torque can be detected and the load state of the rotary drum 7 will be described later. Alternatively, the unbalanced state can be determined.

  The second inverter circuit 3B performs sensorless vector control of the compressor motor 6B. The motor current of the compressor motor 6B is detected by the second current detection means 4B, sensorless sine wave drive is performed, and the control means 5 stores it. The rotor position is estimated and compared by comparing the detected current with the current obtained by calculation from the motor parameter to be applied and the voltage applied to the motor, and the rotor phase control is performed by correcting the virtual dq axis in the control program. Since the torque of the compressor motor 6B varies depending on the mechanical rotor position due to structural factors of the compression mechanism, it is necessary to perform position estimation calculation as accurately as possible. In particular, so-called advance control that advances the current phase with respect to the q axis. In this case, the accuracy of position estimation calculation becomes a problem, so ensuring current detection accuracy, ensuring the accuracy of motor parameters, and position estimation algorithms are problems.

  The third inverter circuit 3C drives the blower fan motor 6C by a position sensorless sine wave by open loop rotational speed control, and controls the current by flowing a sine wave current through the blower fan motor 6C. Since it is proportional to the motor rotation speed, stabilization control is performed by controlling the ratio (V / f) between the applied voltage and the drive frequency by the motor current. The rotational speed of the permanent magnet synchronous motor is constant when the driving frequency f is constant, so that the rotational speed of the blower fan motor 6C is constant regardless of power supply voltage fluctuations and load fluctuations. This makes it possible to reduce the rotational speed fluctuation to almost zero. Since the first inverter circuits 3A, 3B, and 3C share the AC power source 1 and the rectifier circuit 2, in order to start and stop the rotation of the rotary drum 7 in which the laundry is stored, the rotary drum drive motor 6A is provided. When rotating, the DC power supply voltage fluctuation becomes very large due to the load of the laundry, etc. However, when the blower fan motor 6C is controlled at a constant open loop drive frequency such as V / f control, the fluctuation of the DC power supply voltage is affected. Since the rotational speed of the blower fan motor 6B that drives the blower fan 10 can be made constant, the fan noise of the blower fan 10 does not change, and the annoying fan noise fluctuation due to the rotational speed fluctuation can be eliminated.

  The current detection means 4A, 4B, and 4C are the three-shunt type current detection method as described above, and one terminal of the shunt resistor is connected to each emitter terminal of the lower arm transistor of the full bridge three-phase inverter circuit. The other terminal is connected to the DC power source negative side N terminal, and is composed of three shunt resistors, so it is called a three-shunt system. In the three-shunt type current detection method, current is detected at the timing when all the lower arm transistors are in a conductive state. Therefore, the loss of one resistor is reduced compared to the one-shunt method without being affected by the switching noise of the inverter circuit switching transistor. Therefore, if the resistance loss is made equal, the resistance value can be increased and the detection accuracy is improved. In particular, as shown in the present invention, when a plurality of inverter circuits are driven simultaneously, switching noise mutual interference occurs at the time of current detection. Therefore, the current detection means of all inverter circuits is made a three-shunt system, and all inverters are driven. By synchronizing the circuit with the same or a multiple of the PWM period of the circuit and detecting the current when all the transistors are on or off, the switching noise mutual interference can be eliminated.

  FIG. 2 is a block diagram of the inverter control means 50 for controlling the second inverter circuit 3B in the first embodiment of the present invention.

  The output signals Iu, Iv, Iw corresponding to each UVW phase of the three-shunt current detection means 4B are input to the A / D conversion means 500, and the A / D conversion means 500 outputs the current signals Iu, Iv corresponding to the respective phase currents. , Iw is added to the 3-phase / 2-phase / d / q coordinate conversion means 501. The three-phase / 2-phase / d / q coordinate conversion means 501 converts the three-phase current into the two-phase current, and then converts the coordinates to the virtual dq axis. The component Iq is obtained.

  The output signal of the three-phase / 2-phase / d / q coordinate conversion means 501 is applied to the position estimation calculation means 502, and the position estimation calculation means 502 calculates the current signal calculated from the motor parameters and the three-phase / 2-phase · d / q. The position estimation calculation is performed by changing the position signal θ so that the output signals of the coordinate conversion means 501 are equal. The q-axis current Iq and the d-axis current Id obtained from the position estimation calculation means 502 are applied to the current comparison means 503, and the rotation speed signal N is applied to the rotation speed comparison means 504. Since the q-axis current Iq is proportional to the torque, it is also called a torque current. The rotation speed comparison means 504 compares the setting signal Ns from the rotation speed control means 505 with the rotation speed signal N, adds the error signal ΔN to the torque current setting means 506, and sets the torque current setting value Iqs according to the error signal ΔN. Is added to the current comparison means 503. The output signal of the current comparison unit 503 is applied to the voltage control unit 507, and the q-axis voltage Vq and the d-axis voltage Vd are controlled so that the q-axis current Iq and the d-axis current Id become set values, respectively. The three-phase voltage control signals Vu, Vv, and Vw are generated by the coordinate reverse conversion means 508.

  The d-axis current Id is calculated from the advance value from the q-axis and the q-axis current Iq, and controls the d-axis voltage control signal Vd, which is omitted in the block diagram. The Iq, Id and rotation speed signal N obtained from the position estimation calculation means 502 are added to the motor output calculation means 509 to estimate and calculate the motor output P. When the motor is a surface magnet motor, the motor output can be obtained by calculation from Equation 3. Here, Em corresponds to the counter electromotive force obtained from the induced voltage constant of the motor and the rotational speed. Therefore, the motor output P can be obtained by calculation from the induced voltage constant, the rotation speed, and the torque current.

  When the motor is an embedded magnet motor, the motor output can be obtained by calculation from Equation 4. Here, ωr represents the number of rotations of the motor in radians, and Ψa represents the magnetic flux of the rotor. Ld and Lq represent d-axis inductance and q-axis inductance, respectively.

  The output signal of the motor output calculation means 509 is applied to the AC input control means 510, and when the motor output increases and the AC input current exceeds a predetermined value, a signal for reducing the motor speed is added to the rotation speed control means 505. Since the AC power supply current further increases when the AC power supply voltage decreases, the output signal vdc of the DC voltage detection means 50 that outputs a signal proportional to the AC power supply voltage is added to the AC input control means 510 to estimate the AC current. Increases accuracy.

  3 to 5 are flowcharts showing a method for driving the compressor motor 6B. 3 is a main flowchart of motor control, FIG. 4 is a flowchart of a carrier signal interruption subroutine, and FIG. 5 is a flowchart of a rotation speed control subroutine.

  In FIG. 3, the motor control program is started at step 100, various initial settings such as steady rotation speed or motor parameters are made at step 101, and then the process proceeds to step 102 where the start flag is determined and the start is started. If there is a flag, the process proceeds to step 103 to execute the activation control subroutine. Next, the process proceeds to step 104 to determine whether or not there is a carrier signal interrupt. If there is a carrier signal interrupt generated at the peak or valley of the carrier signal Cb, the process proceeds to step 105 to execute the carrier signal interrupt subroutine. Proceed to 106 to execute the rotational speed control subroutine, proceed to step 107 to call the motor output P obtained by the rotational speed control subroutine, proceed to step 108 and proceed to step 109 if the motor output P is greater than or equal to the set value Ps. The motor speed is decreased, and then the process proceeds to step 110 to determine the presence or absence of an end flag. If there is an end flag, the process proceeds to step 110 to stop the motor drive.

  FIG. 4 is a flowchart of the carrier signal interrupt subroutine. In step 200, the carrier signal interrupt subroutine starts. In step 201, the electrical angle θ is calculated from the motor drive electrical angular frequency ω and the elapsed time t from the reference time. Next, the routine proceeds to step 202 where the current signal from the current detection means 4B is detected. In order to detect the motor current using the three-shunt type current detection means 4B, as described above, in order to eliminate the influence of the transistor switching of the inverter circuit, high-speed A / D conversion is performed during the ON or OFF period of all the transistors. Detect current.

  Next, the process proceeds to Step 203 to obtain the q-axis current Iq and the d-axis current Id by three-phase / 2-phase / d / q-axis coordinate conversion, and then proceeds to Step 204 to perform position estimation calculation. The general method of position estimation calculation is to change the electrical angle θ so that the measured current value is equal to the current value estimated from the motor parameter, drive frequency, and motor applied voltage. The angle θ is used as a position signal. Next, the routine proceeds to step 205, where Iq and Id obtained by estimation calculation are stored in the RAM of the microcomputer. Next, in step 206, the q-axis voltage Vq and the d-axis voltage Vd obtained in the rotation speed control subroutine are called, and in step 207, two-phase / three-phase coordinate inverse transformation is executed to obtain a three-phase sine wave for each phase. The output voltage is obtained, and the process proceeds to step 208 to perform PWM control. Generally, the compressor motor rotation speed is set to 3000 r / min to 8000 r / min, and a recent compressor motor uses an embedded magnet motor (IPM motor), and is controlled to rotate at high speed by advance angle control.

  FIG. 5 is a flowchart of the rotation speed control subroutine. In step 300, the rotation speed control subroutine starts. In step 301, the DC voltage Vdc is detected and stored, and in step 302, the set drive frequency fs is called. Proceeding to step 303, ΔIq for increasing / decreasing the torque current Iq according to the error signal Δf between the set frequency fs and the actual drive frequency is obtained. Next, proceeding to step 304, the torque current Iq is calculated. Then, d-axis current Id is obtained, and the process proceeds to step 306 to store Iq and Id. Next, the process proceeds to step 307 to calculate the q-axis voltage Vq and the d-axis voltage Vd from Iq and Id, and the process proceeds to step 308 to store Vq and Vd. In step 309, the counter electromotive force Em is calculated from the induced voltage constant and the rotational speed. In step 310, the motor output P is calculated from the torque current Iq and the counter electromotive force Em. When the motor is an IPM motor, the d-axis inductance Ld, the q-axis inductances Lq, Iq, and Id are used, and the motor output P is obtained from Equation 4. Next, the process proceeds to step 311 to store the motor output P, and the process proceeds to step 312 to return the subroutine.

  FIG. 6 shows a carrier signal and current detection timing chart of each inverter circuit of the washer / dryer shown in FIG. Ca is a carrier signal of the inverter circuit 3A, Cb is a carrier signal of the inverter circuit 3B, Cc is a carrier signal of the inverter circuit 3C, and the carrier frequencies of the carrier signals Ca and Cc are exactly the same and synchronized. The carrier frequency of Cb is synchronously set to an integer ratio of 4: 1.

  Gpa1 and Gna1 are gate signals for the U-phase upper arm and lower arm of the inverter circuit 3A. A / Da is a trigger signal for the A / D conversion means for detecting the current signal of the current detection means 4A. The A / D conversion operation is performed at times t1, t3, and t5 at which the current peaks. Gpb1 and Gnb1 are gate signals of the U-phase upper arm and lower arm of the inverter circuit 3B, A / Db indicates a trigger signal of the A / D conversion means for detecting the current signal of the current detection means 4B, and the peak of the carrier signal Cb A / D conversion is performed at time t3. Gpc1 and Gnc1 are gate signals of the U-phase upper arm and lower arm of the inverter circuit 3C, A / Dc indicates a trigger signal of the A / D conversion means for detecting the current signal of the current detection means 10c, and the peak of the carrier signal Cc An A / D conversion operation is performed at times t2 and t4. The inverter circuits 3B and 3C are A / D converted alternately with the carrier signal, and the A / D conversion timing of the inverter circuit 3A is A at the timing of the peak (t3) or trough (t1, t5) of the carrier signal of the inverter circuit 3B. Since / D conversion is performed, mutual interference due to switching noise can be eliminated.

  In FIG. 6, since the switching timing of the inverter circuit 3B that drives the compression motor 6B may overlap with the A / D conversion timing of the inverter circuit 3C, the A / D conversion timing of the inverter circuit 3C is changed to t1 and t5. Three or more A / D conversion timings may not be overlapped. However, since the inverter circuit 3C drives the fan motor, the current value is relatively small and the shunt resistance resistance value can be increased to reduce the current detection error and reduce the influence of noise. Therefore, there is no problem with the timing shown in FIG. However, since the current detection shunt resistance of the inverter circuits 3A and 3B is small and it is necessary to increase the current detection gain, it is easily affected by noise. Therefore, the A / D conversion timing must be set to the peak or valley of the carrier signal Cb. There is.

(Embodiment 2)
FIG. 7 shows a block diagram of the inverter control means of the motor driving device of the washing / drying machine according to the second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The output signal of the A / D conversion means 500 is applied to the 3-phase / 2-phase / d / q coordinate conversion means 501 and the 3-phase / 2-phase / a / r coordinate conversion means 501a. The three-phase / 2-phase / a / r coordinate conversion means 501a converts the three-phase current into the two-phase current, and then converts the coordinates to the a-r axis based on the motor applied voltage. The current Ir and the effective current Ia are obtained.

  Here, θ1 is a phase difference from the motor applied voltage axis (Va axis) and is represented by θ1 = θ + δ, and δ is a phase difference between the q axis and the applied voltage Va and is called an internal phase difference angle or a load angle. The reactive current Ir and the effective current Ia can be obtained by calculation according to Equation 6 if the d-axis current Id, the q-axis current Iq, and the load angle δ are known.

  The effective current Ia and the previously known motor applied voltage Va are applied to the motor input calculation means 511, the motor input Pi is obtained from the product of Ia and Va, and is applied to the AC input control means 510a. The AC input control means 510a outputs a rotation speed control signal when the motor input Pi or the AC input current increases. The motor applied voltage Va can also be obtained from the mean square of the q-axis voltage Vq and the d-axis voltage Vd.

  FIG. 8 shows a vector diagram of the embedded magnet motor, and shows the relationship between the rotor rotation coordinate system (dq coordinate system) and the inverter output voltage coordinate system (ar coordinate system). The motor current I is vector-decomposed into a d-axis current Id and a q-axis current Iq in the dq coordinate system, and an effective current Ia on the same direction axis (a axis) as the inverter output voltage Va and the inverter in the ar coordinate system. The reactive current Ir is perpendicular to the output voltage axis (a axis), and the phase of the current I and the induced voltage Em is β, and the phase of the voltage Va and the induced voltage Em (internal phase difference angle) is δ. In the embedded magnet motor, when the current Iq or the current Id is controlled so that the current phase is advanced from the q axis by the phase angle β, the reluctance torque becomes positive and the torque is increased as compared with the surface magnet motor. Field weakening control is common.

(Embodiment 3)
FIG. 9 shows a block diagram of the inverter control means of the motor driving device of the washing / drying machine in the third embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The block diagram shown in FIG. 9 shows a block diagram of the control means of the inverter circuit 3A for driving the rotary drum drive motor 6A. Since the rotary drum motor 6A incorporates the position detection means 60a, the sensorless sine wave shown in FIG. The position estimation calculation means 502 necessary for driving is not necessary. However, since the position detecting means 60a constituted by a Hall IC or the like can generally only detect the position at intervals of 60 degrees, the position calculating means 512 has a period of the position signal during 60 degrees when the position signal is not output, or The rotor position θ is obtained by calculation from the time interval. The rotor position signal θ is applied to the three-phase / 2-phase / d / q coordinate conversion means 501 and the rotation speed detection means 513. The output signal of the rotation speed detection means 513 is applied to the rotation speed comparison means 504 and the counter electromotive force calculation means 914. The counter electromotive force calculation means 514 calculates the counter electromotive force Em from the rotor rotation speed and the induced voltage constant of the motor. The motor output P is obtained from the product of the counter electromotive force Em and the q-axis current Iq obtained by the computation by the 3-phase / 2-phase / d / q coordinate transformation means 501 in addition to the motor output estimation computation means 509a. When the motor is an embedded magnet motor, the motor output P can be obtained by calculation from Equation 4 as in FIG.

  When the number of poles and the number of rotations of the rotary drum drive motor 6A increase, the position signal error of the rotor position detecting means 60a increases. Therefore, at the time of dehydration and high speed rotation, sensorless sine wave driving is performed without being controlled by the signal of the rotor position detecting means 60a. Since the motor current waveform distortion is reduced, sensorless vector control by position estimation calculation or sensorless sine wave drive by V / f control without position estimation calculation is performed. At that time, the motor power detection method shown in the first embodiment or the second embodiment is also adopted in the rotary drum drive motor 6A.

  FIG. 10 shows a flowchart of the motor driving device of the washing / drying machine according to the third embodiment of the present invention, in which the first inverter circuit 3A for driving the rotary drum driving motor 6A and the compressor motor 6B are driven. The main flowchart of the motor control at the time of the dehydration operation which controls the 2nd inverter circuit 3B to perform simultaneously is shown.

  At step 100, the motor drive of each of the rotary drum drive motor 6A and the compressor motor 6B is started. After various initial settings or start-up control at step 101a, the process proceeds to step 104a and then the carrier signal of the inverter circuit 3A. The presence / absence of the Ca interrupt signal is determined, and if there is a carrier signal interrupt generated at the peak or trough of the carrier signal Ca, the routine proceeds to step 105a to execute the carrier signal interrupt subroutine A, and then proceeds to 106a. The rotation speed control subroutine A is executed. The carrier signal interruption subroutine A controls the rotary drum drive motor 6A and its first inverter 3A, and is basically the same as the flowchart shown in FIG. 4, and estimates the rotor position signal θ or detects the position. The difference is whether to calculate from the means 60a. The rotation speed control subroutine A is substantially the same as the flowchart shown in FIG.

  Next, the routine proceeds to step 104b, where it is determined whether or not there is an interrupt signal of the carrier signal Cb of the inverter circuit 3B, and if there is a carrier signal interrupt generated at the peak or valley of the carrier signal Cb, the routine proceeds to step 105b. Subroutine B is executed, and then the routine proceeds to 106b where the rotation speed control subroutine B is executed. Since the carrier signal interrupt subroutine B and the rotation speed control subroutine B are the same as those in the first embodiment, description thereof is omitted. Next, the process proceeds to step 107a, and the motor outputs Pa and Pb obtained in the rotation speed control subroutine A in step 106a and the rotation speed control subroutine B in step 106b are called, and the process proceeds to step 108a to sum the motor outputs Pa and Pb. Is equal to or greater than the set value Ps, the routine proceeds to step 109a, where the rotational speed of the rotary drum drive motor 6A or the compressor motor 6B is reduced. You may reduce each rotation speed of 6 A of rotary drum drive motors, and the compressor motor 6B. Next, the routine proceeds to step 110a, where it is determined whether or not there is an end flag. If there is an end flag, the routine proceeds to step 110 where the motor drive is stopped.

  The control method of the rotary drum drive motor 6A and the compressor motor 6B has been described above, but the control of the blower fan motor 6C is the same, and all motor outputs are obtained by calculation, and the motor power consumption is estimated and calculated. The input can be estimated and calculated, and the motor rotational speed can be controlled so as to be equal to or less than a predetermined input current. Since the fan fan motor 6C has almost no torque fluctuation, the control method is relatively simple, and stabilization control can be performed by integral control so that the reactive current Ir becomes a predetermined value in the vector diagram shown in FIG. In addition, since the effective current is calculated at the same time, it is easy to calculate the motor input.

  As described above, according to the first, second, and third embodiments, the compressor motor is driven by sensorless sine wave drive of the compressor motor 6B of the heat pump cycle that is operated simultaneously with the rotary drum drive motor 6A of the washer / dryer. 6B motor input or output power can be easily obtained by estimation calculation, so AC input current can be estimated without AC current detection means, and when the AC input current exceeds a predetermined value, the motor speed is controlled. By reducing the motor input, the AC input current can be reduced, and the increase in the outlet current and the operation of the indoor breaker can be suppressed.

  Further, as shown in the third embodiment, the motor input of the rotating drum driving motor 6A is driven by driving the rotating drum driving motor 6A with a sine wave by the current detecting means 4A for detecting the motor current or the rotor position detecting means 60a. Alternatively, the estimation calculation of the output power becomes easy, so that the total input of the rotary drum drive motor 6A and the compressor motor 6B can be estimated and calculated, and the estimation calculation accuracy of the AC input current can be improved, and the AC input current detection means can be reduced. Therefore, it is possible to realize an inexpensive and reliable motor driving device for a washing and drying machine with a small number of parts.

  As described above, since the motor driving device of the washing and drying machine according to the present invention can suppress the increase of the AC input current by estimating the AC input current even without the AC input current detecting means, in the outdoor unit of the air conditioner The present invention can also be applied to applications such as simultaneous driving of a compressor motor and a cooling motor, simultaneous driving of a compressor motor and a plurality of cooling motors, and a driving device for a large refrigerator that simultaneously drives a plurality of compressor motors.

Block diagram of motor drive device of washing and drying machine in Embodiment 1 of the present invention Block diagram of inverter control means of the motor drive device Flow chart of motor control program of the motor drive device Flowchart of carrier signal interrupt subroutine of the motor drive device Flow chart of rotation speed control subroutine of the motor drive device Timing chart of PWM cycle and current detection timing of inverter control means of the motor drive device The block diagram of the inverter control means of the motor drive device in Embodiment 2 of this invention Control vector diagram of the motor drive device The block diagram of the inverter control means of the motor drive unit in Embodiment 3 of this invention Flow chart of motor control program of the motor drive device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC power supply 2 Rectifier circuit 3A 1st inverter circuit 3B 2nd inverter circuit 4A 1st electric current detection means 4B 2nd electric current detection means 5 Control means 6A A rotating drum drive motor (1st motor)
6B Compressor motor (second motor)
7 Rotating drum 50 Inverter control means 51 DC voltage detection means

Claims (7)

A rectifier circuit that converts AC power of an AC power source into DC power, first and second inverter circuits that convert DC power of the rectifier circuit into AC power, and first and second inverter circuits connected to the first and second inverter circuits First and second current detection means, and control means for controlling the first and second inverter circuits, wherein the control means drives the rotating drum of the washing and drying machine by the first inverter circuit. The first motor is driven, and the second inverter circuit drives a second motor that drives a compressor of a heat pump heat exchanger that blows warm air into the rotary drum. Alternatively, the first or second motor is controlled by estimating and calculating the input power or the output power of the second motor, and the mode of the washing / drying machine configured to control the AC input current. Drive. A first motor for driving a rotating drum or a second motor for driving a compressor of a heat pump heat exchanger, comprising DC voltage detecting means for detecting a DC voltage of a rectifier circuit that converts AC power into DC power 2. The motor driving apparatus for a washing / drying machine according to claim 1, wherein the AC input current is controlled by the input or output power of the AC and the output signal of the DC voltage detecting means. A second inverter circuit that sensorlessly drives a second motor that drives a compressor of a heat pump heat exchanger; a current detection unit that detects the second motor current; and a control unit, the current detection unit The motor driving apparatus for a washing and drying machine according to claim 1, wherein the input electric power or the output electric power of the second motor is estimated and calculated from the motor current detected by the method. The torque of the second motor that drives the compressor is estimated and calculated by the current detection means, and the input power or output power of the second motor is estimated and calculated from the estimated calculation torque and the motor rotational speed. The motor driving device of the washing and drying machine described. 4. An effective current of a second motor that drives a compressor is estimated and calculated by a current detection means, and an input power or an output power of the second motor is estimated and calculated from the effective current and a motor applied voltage. The motor driving device of the washing and drying machine described. The current detection means estimates and calculates the input power or output power of the second motor that drives the compressor, and controls the second motor rotation speed so that the input power or output power is a predetermined value or less. The motor driving device of the washing / drying machine according to claim 2. A first inverter circuit for driving a first motor for driving a rotating drum; a second inverter circuit for sensorless driving a second motor for driving a compressor of a heat pump heat exchanger; and the first motor. First current detection means for detecting current, second current detection means for detecting the second motor current, and control means, and input of the first motor by the first current detection means The power or output power is estimated and calculated, the input current or output power of the second motor is estimated and calculated by the second current detection means, and the AC input is based on the total power of the first motor and the second motor. 2. The motor driving device for a washing and drying machine according to claim 1, wherein the current is controlled.

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