JP2001292592A - Controller for sr motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller for an SR motor, which supplies the motor with a current to meet the load and the number of revolutions, without having to use a current detector and a current compensator. SOLUTION: In a controller for an SR motor, a PWM control part 6, which outputs a PWM signal to an inverter to supply a motor with a voltage, stores inductance L of winding, an angle differential dL/dθ of L, an excitation current i to be supplied to the motor, and an angle differential di/dθ of i inside a memory 19, according to the positional angle θ of the rotor of the motor, and also it obtains a voltage V(θ) to be supplied to the motor, according to the positional angle θ of the rotor of the above motor, based on the voltage equation V(θ)= R×i(θ)+i(θ)×dL/dt(θ)×dθ/dt+L(θ)×di/dt(θ)×dθ/dt}, using those data, and sets the duty factor of the PWM signal, based on the voltage V(θ).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for driving a switched reactance motor (hereinafter, referred to as an SR motor) by energization control.

[0002]

2. Description of the Related Art An SR motor is provided with salient poles on a rotor and a stator, and excites the stator salient poles by passing a current through a winding wound around the salient poles of the stator, thereby generating a magnetic attraction force generated on the stator salient poles. This is a motor that draws rotor salient poles to generate rotational force. Therefore, a switching element for supplying an exciting current is provided for each stator winding of each phase, and a rotational position of the rotor, that is, an electrical angle of the rotor is detected by a detector, and the switching element is switched according to the detected electrical angle. The phase of the stator to be excited is determined by opening and closing the motor. Such an SR motor is disclosed, for example, in JP-A-1-298940.

In general, when an arbitrary exciting current is supplied to a motor, a current error is obtained by comparing the arbitrary exciting current with an applied current actually supplied to the motor, and the comparison error is compensated. Thus, the pulse modulation (hereinafter referred to as PWM) waveform signal for controlling the opening and closing of the switching element is controlled. A technique for rotating the SR motor using PWM control is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-65685.

[0004]

In the driving of an SR motor, if the exciting current to be supplied is not appropriate, vibration and vibration due to torque ripple of the motor and a change in the magnetic attraction force of the stator are reduced.
Noise is generated. In order to prevent such vibration and noise from occurring, it is necessary to supply an exciting current to the motor according to the load and the number of revolutions.

In the prior art, in order to supply an exciting current corresponding to a load or a rotational speed to a motor, a target exciting current corresponding to a load or a rotational speed is compared with an applied current actually supplied to the motor. In order to obtain the error, a current detector for detecting the applied current supplied to the motor and a current compensator for compensating for a current error between the applied current and a target excitation current corresponding to the load or the number of rotations are required. Was hanging.

In the prior art, a PWM waveform signal is created based on a deviation between an applied current and a target excitation current, and a voltage is applied to the motor. However, since the winding inductance of the SR motor changes according to the rotor position, the relationship between the exciting current and the motor supply voltage also changes according to the rotor position. Therefore, when the voltage supplied to the motor is controlled by the control of the related art, the target excitation current cannot be supplied to the motor uniformly and accurately at all the rotor position angles.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a control device for an SR motor that supplies a current corresponding to a load or a rotation speed to a motor without using a current detector and a current compensator. And Further, the present invention provides an SR motor control device which can supply a target excitation current to a motor with higher accuracy than when only a current detector and a current compensator are used to supply a current corresponding to a load or a rotation speed to the motor. The purpose is to provide.

[0008]

In order to achieve the above object, in a control apparatus for an SR motor according to the present invention, a rectifying means for rectifying an alternating current supplied from a commercial power supply, and a rectifying means for rectifying the alternating current supplied from the rectifying means. Inverter means for converting the DC current into a three-phase current and supplying the three-phase current to the motor, position detection means for detecting the rotor position of the motor, and PWM control for the inverter means based on a rotor position signal output from the position detection means. A control circuit that outputs a signal, the control circuit previously stores a winding pure resistance and a winding inductance of the motor and an excitation current to be supplied to the motor in accordance with a rotor position angle of the motor, The motor is supplied to the motor according to a rotor position angle of the motor from a voltage equation formed by the winding pure resistance, the winding inductance, and the exciting current. Determined voltage, is characterized by setting the duty of the PWM signal.

Further, in the control apparatus for an SR motor according to the present invention, a rectifying means for rectifying an alternating current supplied from a commercial power supply, and a dc current supplied from the rectifying means is converted into a three-phase current to provide a three-phase current to the motor. Inverter means for supplying, a position detecting means for detecting a rotor position of the motor, a control circuit for outputting a PWM signal to the inverter means based on a rotor position signal outputted from the position detecting means, and a signal supplied to the motor. Current detection means for detecting a current, wherein the control circuit pre-stores a winding pure resistance and a winding inductance of the motor and an exciting current supplied to the motor in accordance with a rotor position angle of the motor. And a rotor position of the motor based on a voltage equation constituted by the winding pure resistance, the winding inductance, and the exciting current. A motor supply voltage to be supplied to the motor is obtained according to the degree, and the motor supply voltage is corrected according to a deviation between an exciting current supplied to the motor and a current value detected by the current detecting means, and the corrected The duty of the PWM signal is set based on the motor supply voltage.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a control device for an SR motor according to the present invention will be described with reference to the drawings. FIG.
FIG. 1 is a diagram illustrating a configuration of a control device for an SR motor according to a first embodiment of the present invention.

An AC voltage supplied from a commercial AC power supply 1 is rectified and smoothed by a DC unit 2 to become a DC voltage. DC device 2 includes a diode 30a as shown in FIG.
30d and capacitors 31a and 31b. In the present embodiment, a doubler rectifier circuit is used for the DC unit 2, but a full-wave rectifier circuit or the like may be used according to the usage conditions of the SR motor.

The DC voltage rectified and smoothed by the DC unit 2 is supplied to the inverter 3. The inverter 3 shown in FIG.
As shown in the figure, six NPN transistors 32a to 32c and 33a to 33c are connected as a switching means in a three-phase full-wave bridge configuration. The diodes 34a to 34c and 35a to 35c are connected in parallel to the six transistors 32a to 32c and 33a to 33c, respectively. The connection points a, b, and c between the transistors 32a to 32c and the transistors 33a to 33c are connected to the stator windings of each phase (U phase, V phase, W phase) of the motor 5.

The PWM control unit 6 includes transistors 32a-32
Voltages supplied to the SR motor 5 are controlled by sending PWM signals P1 to P6, which will be described later, to the bases of 32c and 33a to 33c to turn on / off the transistors.

The SR motor 5 is provided with a position detector 4 composed of a hall sensor or the like, and a position detection signal H from the position detector 4 is input to a PWM control unit 6. The PWM control unit 6 is a microcomputer having a memory 19, and performs PWM based on a position detection signal H from the position detector 4.
Generate the signals P1 to P6.

The PWM controller 6 uses the following SR motor voltage equation to generate a PWM signal. V = R × I + dφ / dt V = R × I + d {L × I} / dt V = R × I + I × dL / dt + L × dI / dt Equation (1) is the voltage per phase of the reluctance motor. R is the motor winding pure resistance, L is the motor winding inductance, φ is the number of flux linkages, V is the inter-winding supply voltage, and I is the motor excitation current.

Further, when the equation (1) is modified by the time derivative of the angle (hereinafter referred to as angular velocity) dθ / dt and an arbitrary current i (θ) and its angular derivative di / dt (θ), V (θ) is obtained. = R × i (θ) + i (θ) × dL / dt (θ) × dθ / dt + L (θ) × di / dt (θ) × dθ / dt (2)

Based on the equation (2), the PWM control unit 6 creates a PWM signal with a configuration as shown in FIG. In addition,
In the following description, only the U phase will be described,
For the phase and the W phase, an arbitrary current waveform can be obtained in the same manner as the U phase by storing the corresponding i data table and di data table of each phase in the memory 19 in advance.

The position signal H from the position detector 4 is input to a rotor position / rotation speed detection circuit 7. The rotor position / rotation speed detection circuit 7 calculates the rotor position angle θ based on the position signal H from the position detector 4, outputs the value to the memory 19 for each unit angle, and differentiates the rotor position angle θ with time. Then, the rotor angular velocity dθ / dt is obtained, and the value is output to the voltage calculation circuit 12 for each unit angle.

As shown in FIG. 3, the detection resolution of the rotor position angle may be artificially increased by using a timer provided inside the PWM control section 6. In FIG. 3, S is the minimum resolution (= 5 °) obtained from the edge timing of the position signal H from the position detector 4. By measuring the interval at which the edge timing of the position signal H appears, using a timer provided inside the PWM control unit 6, the edge timing period T (= 5 ms) is obtained. Division number n that arbitrarily determines minimum resolution S and edge timing period T
(= 5) and measuring the T / n (= 1 ms) interval with a timer, the detection resolution of the rotor position angle becomes S /
n (= 1 °).

The memory 19 stores the L data table 8 and d
L / dθ data table 9 and i data table 10
And a di / dθ data table 11.

The L data table 8 is a data table in which values of the inductance L of the winding, which is a characteristic unique to the motor itself, measured in advance for each unit angle are stored. FIG. 4 shows the characteristics of the inductance L of the SR motor 5 used in the embodiment of the present invention. Data L (θ) corresponding to the angle data θ given from the rotor position / rotation speed detection circuit 7 is read from the L data table 8 for each unit angle and output to the voltage calculation circuit 12.

The dL / dθ data table 9 is a data table in which a value obtained by preliminarily measuring the value obtained by angularly differentiating the inductance L for each unit angle is stored as a data table.
FIG. 5 shows the angular differential characteristics of the inductance L of the SR motor 5 used in the embodiment of the present invention. Data dL / dθ (θ) corresponding to the angle data θ given from the rotor position / rotation speed detection circuit 7 is read from the data table for each unit angle, and output to the voltage calculation circuit 12.

The i data table 10 is obtained by sampling a target current waveform for each unit angle, forming a data table, and storing the data. Similarly, the di data table 11
Is obtained by sampling the angle differential value of the target current waveform for each unit angle, forming a data table, and storing it.

Data i (θ) corresponding to the angle data θ given from the rotor position / rotation speed detection circuit 7 is read from the i data table 10 for each unit angle and output to the mixer 14. The mixer 14 is the i data table 1
The signal i ^* (θ) output from 0 is mixed with the current gain signal K to obtain i (θ) amplified by the current gain, and then output to the voltage calculation circuit 12.

A signal S1 based on an operation program is sent from a control unit of an electric device equipped with a control device of the SR motor,
It is sent to the current gain setting circuit 16. Current setting circuit 16
Sets a current gain based on the signal S1 and sends a current gain signal K to the PWM control unit 6.

The data di (θ) corresponding to the angle data θ given from the rotor position / rotation speed detection circuit 7
Are read from the di data table 11 for each unit angle and output to the mixer 15. The mixer 15 is di / d
di ^* / dθ output from θ data table 11
(Θ) and the current gain signal K are mixed to obtain di / dθ (θ) amplified by the current gain, and then output to the voltage calculation circuit 12.

Therefore, the voltage calculation circuit 12 has L
(Θ), dL / dθ (θ), i (θ), di / dθ
Four data of (θ) are input. Voltage calculation circuit 12
Calculates the motor supply voltage V (θ) to be supplied to the motor 5 for each unit angle from the input data based on the equation (2), and converts the data of the motor supply voltage V (θ) into a voltage-PWM conversion circuit 13. Output to The voltage calculation circuit 12 stores the winding pure resistance R of the motor 5 in advance.

The voltage-PWM conversion circuit 13 divides the motor supply voltage V (θ) by the DC voltage supplied to the inverter 3 based on the motor supply voltage V (θ) data sent from the voltage calculation circuit 12. To find the duty value,
Using the built-in timer, P
A WM signal is created and output to the bases of the transistors 32a and 33a constituting the inverter 3 as drive signals P1 and P2. With such a configuration, the same current as the target excitation current can be supplied to the motor 5 as the excitation current.

In the voltage-PWM conversion circuit 13 of the present embodiment, it is assumed that the DC voltage supplied to the inverter 3 is always 141 V obtained when a rated voltage of 100 V is output from the commercial power supply. Calculation.

In the first embodiment, the L data table and the dL / dθ data table are created on the assumption that the winding inductance L of the motor depends only on the electrical angle θ of the rotor position. However, actually, as shown in FIGS. 6 and 7, the characteristic of the inductance L and the angle differential dL / dθ of the inductance L greatly changes depending on magnetic saturation, that is, the magnitude of the exciting current.

FIG. 6 shows how the inductance L (θ) changes according to the magnitude of the exciting current. As the exciting current increases, L (θ) becomes L ₁ (θ) → L
₂ (θ) → L ₃ (θ). FIG. 7 shows how the angle derivative dL / dθ (θ) of the inductance L (θ) changes according to the magnitude of the exciting current. As the exciting current increases, dL / dθ (θ) becomes dL ₁ / dθ.
(Θ) → dL ₂ / dθ (θ) → dL ₃ / dθ (θ).

Without considering such a characteristic of the inductance L and the angle differential dL / dθ of the inductance L, the PWM
When the signal is generated, there is a possibility that the motor may vibrate due to the fluctuation of the current gain. Therefore, a PWM signal may be created in the second embodiment as shown in FIG. 8 so that L and dL / dθ correspond to not only the rotor position angle θ but also the current gain. The same parts as those in FIG. 2 are denoted by the same reference numerals.

As shown in FIG. 9, the L data table 8a is a data table in which the inductance L is sampled in advance for each unit angle and for each unit amount of the current gain. Data L (θ) corresponding to the information of the angle θ from the rotor position / rotation speed detecting circuit 7 and the current gain signal K from the current gain setting circuit 16 is read from the L data table 8a for each unit angle, Output to the voltage calculation circuit 12.

The dL / dθ data table 9a is shown in FIG.
As shown in FIG. 7, data obtained by sampling dL / dθ, which is the angular derivative of the inductance L, in advance for each unit angle and for each unit amount of current gain, is stored as a data table. Data dL / dθ (θ) corresponding to the information of the angle θ from the rotor position / rotation speed detection circuit 7 and the current gain signal K from the current gain setting circuit 16 are obtained from the dL / dθ data table 9a for each unit angle. It is read out and output to the voltage calculation circuit 12.

With this configuration, an appropriate current can be supplied to the SR motor 5 even when the exciting current becomes large and magnetic saturation occurs.

Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 11 shows the third
It is a figure showing composition of a control device of an SR motor in an embodiment. The same parts as those in FIG. 1 are denoted by the same reference numerals. A voltage detector 22 that detects a DC voltage supplied to the inverter 3 is provided between the DC unit 2 and the inverter 3.

The voltage detector 22 uses the voltage at the connection node between the resistors R1 and R2 as a DC voltage detection signal E1 in PWM.
Output to the control unit 6. The DC voltage detection signal E1 is shown in FIG.
Is input to the voltage-PWM conversion circuit 13 in the PWM control unit 6 as shown in FIG. A PWM signal is created based on the DC voltage detection signal E1. That is, when the DC voltage is higher than the rated voltage value 141V, the duty width of the PWM signal is reduced uniformly. When the DC voltage is smaller than the rated voltage value 141V, the duty width of the PWM signal is increased uniformly. In FIG. 12, FIG.
The same reference numerals are given to the same parts as.

According to this configuration, even when the DC voltage supplied to the inverter 3 fluctuates due to the fluctuation of the AC voltage supplied from the commercial AC power supply 1, the motor supply voltage V
The data of (θ) can be accurately modulated into a PWM signal.

In the present embodiment, the voltage detector 22 is provided between the DC unit 2 and the inverter 3 to detect the DC voltage supplied to the inverter 3.
A voltage detector 22 may be provided between the DC power supply 2 and the DC power supply 2 to detect the AC voltage supplied to the DC power supply 2 and obtain the DC voltage supplied to the inverter 3 from the peak value of the AC voltage.

Next, a fourth embodiment of the present invention will be described with reference to the drawings. S in the fourth embodiment
The control device for the R motor is the same as that of the third embodiment shown in FIG.
However, unlike the third embodiment, the PWM control unit 6 has a configuration as shown in FIG.
In FIG. 13, the same portions as those in FIG. 12 are denoted by the same reference numerals.

The speed controller 18 has a position / speed calculation circuit 7
Receives the actual rotation speed dθ / dt from the controller, and receives the speed command value S2 output from the memory 19 based on the operation program from the control unit of the electric device in which the control device of the SR motor is mounted. The comparator 17 calculates the actual rotational speed d.
θ / dt is compared with the speed command value S2, and the speed command value S2
Deviation δ which is the value obtained by subtracting the actual rotational speed dθ / dt from
1 is output to the current gain setting circuit 16. The current gain setting circuit 16 sets a current gain signal K based on the deviation δ1 and the signal S1, and stores the current gain signal K in the L data table 8a, the dL / dθ data table 9a, the mixer 14,
Output to the mixer 15. When the deviation δ1 is a positive value, the current gain signal K is set to be relatively large, and the deviation δ1
Is a negative value, the current gain signal K is set smaller.

According to this configuration, even when the load torque of the SR motor 5 fluctuates, the rotation speed of the SR motor 5 can be maintained according to the operation program. An example of a case where the load torque fluctuates is that the control device of the SR motor is mounted on the washing machine, and when the rotating tub of the washing machine is rotated by the SR motor 5, the degree of entanglement of the clothes changes. And the load changes.

When the deviation δ1 is equal to or smaller than a predetermined range, the current gain may be set in accordance with only the signal S1 by regarding the deviation δ1 as zero. This allows
Excessive current gain control when the actual rotation speed is close to the speed command value can be suppressed, and the control system can be stabilized.

Next, a description will be given of a fifth embodiment in which a current detector and a current compensator are added to the SR motor control device of the first embodiment. The control device for an SR motor according to the fifth embodiment has a configuration as shown in FIG. FIG.
The same parts as those described above are denoted by the same reference numerals. The voltage detectors 20u, 20v, and 20w detect the excitation current supplied to the stator windings of each phase (U-phase, V-phase, and W-phase) of the motor 5, and output a detection signal to the PWM control unit 6.

The PWM control unit 6 in the fifth embodiment
Is the PWM in the first embodiment as shown in FIG.
The current compensator 23 is added to the control unit 6. The same parts as those in FIG. 2 are denoted by the same reference numerals. Detection exciting current signal i _m detected by the current detector 20u is inputted to the comparator 17. The comparator 17, the exciting current i _m and the target excitation current is compared with the I (theta), the target excitation current signal I (theta) from the detected exciting current signal i _m voltage correction circuit deviation δ2 is a value obtained by subtracting 21.

The voltage correction circuit 21 calculates the motor supply voltage V output from the voltage calculation circuit 12 based on the deviation δ2.
After correcting the data of (θ) to V ₁ (θ) data, V ₁
(Θ) data to the voltage-PWM conversion circuit 13.
When the deviation δ2 is a positive value, the value obtained by adding the correction amount to V (θ) is V ₁ (θ), and when the deviation δ2 is a negative value, the correction amount is reduced to V (θ). The result is defined as V ₁ (θ).

With this configuration, the voltage equation between the exciting current and the motor supply voltage, which varies according to the rotor position angle, is updated for each unit angle. An exciting current can be supplied to the motor 5.

In the SR motor control device according to the fifth embodiment, a voltage detector 22 is further added as in the third embodiment, and a PWM signal is supplied in accordance with the DC voltage supplied to the inverter 3. It is good also as composition which creates. Further, a speed controller 18 may be added as in the fourth embodiment, and the current gain signal K may be set according to the actual rotation speed.

FIG. 18 is a schematic view of a washing machine on which the control device for an SR motor according to the present invention is mounted. The washing machine 41 is a one-tub type fully-automatic washing machine, and includes a rotating tub 42 also serving as a washing tub and an outer tub 43 inside the main body. The outer tub 43 is suspended from the main body by a suspension unit 44, and the rotary tub 42 is rotatably installed inside the outer tub 43.
The main body has a lid 46 for taking in and out laundry. A transmission mechanism 48 for transmitting the rotation of the SR motor 5 to the rotary tank 42 is provided below the outer tank 43.

An operation unit 49, a display unit 50,
Buzzer 51 and lid sensor 5 for detecting opening and closing of lid 46
2. A lock mechanism 58 for controlling opening and closing of the lid 46 is provided, and a water level sensor 53 for detecting a water level in the rotary tub 42 is provided beside the rotary tub 42. Further, a main control unit 54 composed of a microcomputer for controlling the entire operation of the washing machine 41 is provided below the operation unit 49. A control device 55 for the SR motor (except for the motor 5, the position detecting means 4, and the commercial AC power supply 1) is provided above the inner surface of the side plate 41a. Numerals 56 and 57 are a water supply valve and a drain valve for adjusting the amount of water in the outer tub 3.

The main control unit 54 stores programs such as washing, rinsing, and dehydrating operations of each step, and an execution sequence of the steps (that is, a processing course). According to the programs, the water supply valve 56 and the drain valve are stored. The opening and closing of the washing machine 41 is controlled, and the washing machine 41 is operated by transmitting the signal S1 together with the synchronization clock signal to the PWM control unit 6, which is a component of the control device 55 of the SR motor.

It should be noted that the electric equipment on which the control device for the SR motor according to the present invention is mounted is not limited to a washing machine.
It also applies to other electrical equipment.

[0053]

According to the present invention, the motor is controlled in accordance with the rotor position angle based on the voltage equation having the motor winding pure resistance, the motor winding inductance, and the excitation current supplied to the motor as components. Since the motor supply voltage to be supplied to the motor is obtained, and the duty of the PWM signal is set based on the motor supply voltage, the target excitation current can be supplied to the SR motor without using a current detector or a current compensator, thereby reducing costs. Can be achieved.

Further, according to the present invention, the resolution of the rotor position angle of the motor is improved by dividing the minimum resolution of the rotor position signal using a timer, so that the motor supply voltage can be finely controlled.

Further, according to the present invention, the peak value of the exciting current supplied to the motor is varied by multiplying the exciting current value supplied to the motor stored in advance by the current gain, so that the motor torque is adjusted. It becomes possible. This allows the SR motor to be used in various operating states.

Further, according to the present invention, the inductance of the motor is stored in advance in accordance with the rotor position angle and the current gain of the motor, and the pure winding resistance of the motor, the winding inductance of the motor, the exciting current of the motor and The voltage to be supplied to the motor is determined according to the rotor position angle and the current gain of the motor based on the voltage equation having the following components, so that even when the characteristic of the motor inductance changes with the change in the current gain, The voltage supplied to the motor is accurately calculated. This makes it possible to supply the SR motor with an exciting current that is accurate with respect to the target exciting current, thereby reducing vibration and noise of the SR motor.

According to the present invention, the motor supply voltage is corrected in accordance with the deviation between the excitation current supplied to the motor recorded in advance by the control circuit and the current value detected by the current detection means. Even when the characteristic of the inductance of the motor changes with the change of the gain, it is possible to supply the SR motor with an exciting current that is accurate with respect to the target exciting current.
The vibration and noise of the SR motor are reduced. Further, after calculating the motor supply voltage for each unit angle of the rotor position angle based on the voltage equation, the motor supply voltage is calculated according to the deviation between the excitation current supplied to the motor and the current value detected by the current detection means. Since the correction is made, the excitation current having a higher accuracy with respect to the target excitation current is provided to the SR motor than when the motor supply voltage is calculated only from the difference between the excitation current supplied to the motor and the current value detected by the current detection means. Can supply.

According to the present invention, the rotation speed of the motor is obtained based on the rotor position signal output from the position detection means, and the current gain is controlled according to the deviation between the rotation speed and the target speed. Even when the load torque fluctuates suddenly, the motor can be driven at the rotation speed according to the operation program.

According to the present invention, when the absolute value of the deviation between the rotation speed of the motor and the previously stored target speed is within a predetermined range, the deviation is regarded as zero and the current gain is controlled. Therefore, control stability can be improved. Thus, excessive current gain control when the actual rotation speed is close to the speed command value can be suppressed, and the control system can be stabilized.

Further, according to the present invention, the duty of the PWM signal is set in accordance with the DC voltage supplied to the inverter means detected by the DC voltage detecting means. Voltage to PWM
No error occurs when converting to a signal. This allows
Excitation current with high accuracy with respect to the target excitation current can be supplied to the SR motor, and vibration and noise of the SR motor are reduced.

Further, according to the present invention, PW is controlled in accordance with the AC voltage supplied to the rectifier detected by the AC voltage detector.
Since the duty of the M signal is set, no error occurs when the motor supply voltage is converted into the PWM signal even when the voltage of the commercial AC power source fluctuates. This makes it possible to supply the SR motor with an exciting current that is accurate with respect to the target exciting current, thereby reducing vibration and noise of the SR motor.

Further, according to the present invention, the motor is driven in accordance with the rotor position angle based on a voltage equation having the motor winding pure resistance, the motor winding inductance, and the excitation current supplied to the motor as components. The control device for the SR motor, which determines the motor supply voltage to be supplied to the washing machine and sets the duty of the PWM signal based on the motor supply voltage, is mounted on the washing machine, so that a washing machine with less vibration and noise is obtained. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an SR motor control device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a PWM control unit which is a component of the control device for the SR motor in FIG. 1;

FIG. 3 is a diagram showing a resolution of a rotor position signal.

FIG. 4 is a characteristic diagram of a winding inductance of an SR motor.

FIG. 5 is a characteristic diagram of an angular differentiation of a winding inductance of an SR motor.

FIG. 6 is a diagram showing a change in characteristics of a winding inductance of an SR motor due to a change in an exciting current.

FIG. 7 is a diagram showing a change in an angular differential characteristic of a winding inductance of an SR motor due to a change in an exciting current.

FIG. 8 is a block diagram of a PWM control unit which is a component of a control device for an SR motor according to a second embodiment.

FIG. 9 is a diagram showing a data table of a winding inductance of an SR motor corresponding to a rotor position angle and a current gain.

FIG. 10 is a diagram showing a data table of angular differentiation of winding inductance of an SR motor corresponding to a rotor position angle and a current gain.

FIG. 11 is a configuration diagram of an SR motor control device according to a third embodiment.

12 is a block diagram of a PWM control device that is a component of the control device for the SR motor in FIG. 11;

FIG. 13 is a block diagram of a PWM control device which is a component of a control device for an SR motor according to a fourth embodiment.

FIG. 14 is a configuration diagram of an SR motor control device according to a fifth embodiment.

15 is a block diagram of a PWM control device which is a component of the control device for the SR motor in FIG. 14;

FIG. 16 is a configuration diagram of a DC unit that is a component of the control device for an SR motor according to the present invention.

FIG. 17 is a configuration diagram of an inverter that is a component of the SR motor control device according to the present invention.

FIG. 18 is a schematic view of a washing machine equipped with the SR motor control device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commercial AC power supply 2 DC unit 3 Inverter 4 Position detector 5 SR motor 6 PWM control unit 7 Rotor position / rotation speed detection circuit 8 L data table 8a L data table 9 dL / dθ data table 9a dL / dθ data table 10 i Data table 11 di / dθ data table 12 Voltage calculation circuit 13 Voltage-PWM conversion circuit 14 Mixer 15 Mixer 16 Current gain setting circuit 17 Comparator 18 Speed controller 19 Memory 20 u, 20 v, 20 w Current detector 21 Voltage correction circuit 22 Voltage Detector 23 Current compensator 30a-30d Diode 31a, 31b Capacitor 32a-32c Transistor 33a-33c Transistor 34a-34c Diode 35a-35c Diode 41 Washing machine 41a Side plate 42 Rotating tub 43 Outer tub 4 Reference Signs List 4 suspension unit 46 lid 48 transmission mechanism 49 operation unit 50 display unit 51 buzzer 52 lid sensor 53 water level sensor 54 main control unit 55 SR motor control device 56 water supply valve 57 drain valve 58 lock mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 3B155 AA10 BA04 CB06 KA36 KB08 LA02 LB18 LB27 LC15 MA01 MA05 MA07 MA08 MA09 5H550 BB05 CC01 CC06 DD09 EE03 FF03 HB07 HB16 JJ03 JJ17 JJ23 JJ25 JJ30 KK23 LL01 LL22

Claims (11)

[Claims] 1. A rectifier for rectifying an alternating current supplied from a commercial power supply, an inverter for converting a dc current supplied from the rectifier into a three-phase current and supplying the three-phase current to a motor, and a rotor position angle of the motor. Position detecting means for detecting
A control circuit for outputting a PWM signal to the inverter means based on a rotor position signal output from the position detection means, wherein the control circuit comprises: a winding inductance of the motor; The excitation current supplied to the motor is stored in accordance with the rotor position angle of the motor, and based on a voltage equation having the winding pure resistance, the winding inductance, and the excitation current of the motor as constituent elements,
A control device for an SR motor, wherein a motor supply voltage to be supplied to the motor is obtained according to a rotor position angle of the motor, and a duty of the PWM signal is set based on the motor supply voltage. 2. The method according to claim 1, wherein the control circuit includes a timer, and the resolution of the rotor position angle of the motor is improved by dividing the minimum resolution of the rotor position signal using the timer. SR according to item 1
Motor control device. 3. The control circuit varies a peak value of the exciting current by multiplying a value of the exciting current stored in advance by a current gain, and the exciting current having a varied peak value and the exciting current. 2. A motor supply voltage to be supplied to the motor according to a rotor position angle of the motor based on a voltage equation having a winding pure resistance and a winding inductance of the motor as components. The control device for an SR motor according to claim 2. 4. The control circuit according to claim 1, wherein said winding inductance is stored in advance in accordance with a rotor position angle of said motor and said current gain, and said winding pure resistance, said winding inductance, said exciting current and 4. The control device for an SR motor according to claim 3, wherein a voltage to be supplied to the motor is determined based on a rotor position angle of the motor and the current gain based on a voltage equation including: 5. A motor control apparatus comprising: a current detecting means for detecting a current supplied to the motor, wherein the control circuit detects a difference between the exciting current stored in advance and a current value detected by the current detecting means. 3. The SR according to claim 1, wherein the motor supply voltage is corrected.
Motor control device. 6. A current detecting means for detecting a current supplied to the motor, wherein the control circuit detects a difference between the exciting current stored in advance and a current value detected by the current detecting means. 4. The SR motor control device according to claim 3, wherein the motor supply voltage is corrected. 7. The control circuit calculates a rotation speed of the motor based on a rotor position signal output from the position detection means, and determines the rotation speed of the motor in accordance with a deviation between the rotation speed and a previously stored target speed. The SR motor control device according to claim 4 or 6, wherein the current gain is controlled. 8. When the absolute value of the deviation between the rotation speed of the motor and a previously stored target speed is less than a predetermined range,
The control device for an SR motor according to claim 7, wherein the current gain is controlled by regarding the deviation as zero. 9. A DC voltage detecting means for detecting a DC voltage supplied from the rectifying means to the inverter means, and the control circuit sets a duty of the PWM signal according to the DC voltage. The control device for an SR motor according to any one of claims 1 to 8, wherein 10. An AC voltage detecting means for detecting an AC voltage supplied from said commercial power supply to said rectifying means, and said control circuit sets a duty of said PWM signal in accordance with said AC voltage. The control device for an SR motor according to any one of claims 1 to 8, wherein 11. An inverter washing machine comprising the control device for an SR motor according to claim 1.