JPH09252588A - Compressor drive control method, double salient pole reluctance motor drive control method and these devices - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To easily set a phase of a winding current, suppress generation of reverse torque, and drive a compressor in a wide rotation speed range. A compressor (1), a DSR motor (2) having a rotary shaft connected to a rotary shaft of the compressor (1), and a DSR motor (2).
To the inverter 3 that supplies a sinusoidal current to the
Winding current detector 4 for detecting the motor winding current of the motor 2
And a rotor position detector 5 for detecting the position of the rotor of the DSR motor 2, and the detected motor winding current and the detected rotor position as inputs, An inverter control unit 6 that controls the inverter 3 so that the phase matches the predetermined rotor phase.
And

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor drive control method, a double salient pole reluctance motor drive control method, and these devices, and more particularly to a double salient pole reluctance motor to which an inverter output is supplied. The present invention relates to a method for driving and controlling a compressor, a method for driving and controlling a double salient pole reluctance motor by supplying the output of an inverter to a double salient pole reluctance motor having full-pitch winding, and these devices.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 12, both a stator and a rotor are formed of a plurality of teeth, and an electromagnetic attraction force generated between the rotor teeth and the stator teeth is generated by a winding current. Double salient pole reluctance motor (Dubly SalientReluctance) designed to obtain rotational force
Motor, hereinafter abbreviated as DSR motor) is known (“Brushless Permanent”).
-Magnet and Reluctance Mot
or Drive ", T.W. J. E. FIG. Miller, CL
ARENDON PRESS / OXFORD 1989
reference).

Since this DSR motor has the structure shown in FIG. 12, it has a characteristic that the structure is simple and inexpensive as compared with an AC motor, and that a high current efficiency does not occur in the rotor. It has the feature of being Further, the DSR motor is roughly classified into one having concentrated winding as shown in FIG. 13 and one having full-pitch winding as shown in FIG.

It is known that the general formula for torque generation of a DSR motor is given by equation 1 ("Theoretical analysis of megatorque motor and its torque control method", Tanaka, Ogasawara, Akagi, Nambae, The Institute of Electrical Engineers of Japan. Power Conversion Research Group SPC-8
7-14). However, L indicates self-inductance, M indicates mutual inductance, i indicates winding current, and the trace letters a, b, and c indicate respective phases of the DSR motor.

[0005]

[Equation 1]

A DSR motor having concentrated winding is shown in FIG.
3 has the configuration shown in FIG.
4 As shown in (A), it changes depending on the rotor position angle,
It is known that the mutual inductance between the windings hardly changes regardless of the rotor position angle (“Brushles”
s Permanent-Magnet and Re
Lancetance Motor Drive ", T.L.
J. E. FIG. Miller, CLARENDON PRES
S. OXFORD 1989).

Therefore, as shown in FIG. 14 (B), if the current is made to flow in a rectangular wave in the section where the gradient of the self-inductance is positive, as shown in FIG. 14 (C), the generated torque without ripple is generated. It is believed that you can get. This can be confirmed from the equation 2 obtained by ignoring the change in the mutual inductance in the equation 1.

[0008]

[Equation 2]

A DSR motor having a full-pitch winding is shown in FIG.
5, the mutual inductance between the windings changes depending on the rotor position angle as shown in FIG. 16A, and the self-inductance hardly changes regardless of the rotor position angle. Known ("Fully pi
tched-winding switched-re
lucance and stepping-mot
or arrangements ", B.I. C. Mecr
ow, PhD, IEEE PROCESSEDINGS-B,
Vol. 140, no. 1, January 199
3 and Japanese Patent Publication No. 7-504079).

Therefore, if rectangular wave-shaped currents are made to flow so as to have the same polarity in the section where the gradient of the mutual inductance is positive and different polarities in the section where the gradient of the negative is negative {see (B) in FIG. 16}, FIG. As shown in 16 (C), it is considered that the generated torque without ripple can be obtained. This can also be confirmed from Equation 3 obtained by ignoring the change in self-inductance in Equation 1.

[0011]

(Equation 3)

Further, since it is considered ideal to flow the rectangular wave current as described above in any drive control of the DSR motor, the inverter of the unipolar drive shown in FIG. 17 is used as the power conversion unit. Has been adopted.

[0013]

However, for example, 10
When driving a compressor normally used in a rotation speed range (medium speed to high speed) of about 150 rps with a DSR motor,
It becomes difficult to flow the rectangular wave current due to the influence of the winding inductance, and as shown in (A) of FIG. 18, the phase of the winding current is delayed with an increase in the rotation speed. When the speed becomes medium to high, it becomes impossible to obtain a sufficient winding current amplitude. As a result, not only the peak of the generated torque is lowered, but also a large reverse torque is generated, and in the worst case, the compressor cannot be operated (see (B) in FIG. 18).

In order to prevent such an inconvenience from occurring, as shown in FIGS. 19A and 19B, the winding current command phase is advanced by the load information and the rotation speed information, and in the section where the inductance is small. It has been proposed to raise the winding current, thereby ensuring the winding current amplitude and suppressing the generation of reverse torque (Japanese Patent Publication No. 7-1189).
No. 27).

However, according to the method disclosed in Japanese Patent Publication No. 7-118927, since the ideal winding current waveform is a rectangular wave, it is necessary to set the amount of advance of the phase for each motor. There is a problem that the creation of the original experimental data is complicated, and the control circuit is complicated, and development is troublesome. Also, load information, rotation speed information,
There is a problem that a large amount of memory is required to store the amount of phase advance.

Therefore, it is difficult to apply the method to a compressor drive control system which is mass-produced and is required to have a low cost. In addition, instead of such measures, it is possible to reduce the inductance, but in this case,
Since the generated torque becomes small, it cannot be put to practical use at all.

Although the case where the present invention is applied to the compressor drive control system has been discussed above, the same problem occurs in a system that controls the drive of a load other than the compressor.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is easy to set the phase of the winding current, suppress the generation of reverse torque, and realize a compressor in a wide rotation speed range. A first object of the present invention is to provide a compressor drive control method and device capable of driving, and a double protrusion capable of easily setting the phase of a winding current and suppressing generation of reverse torque. A second object is to provide a pole reluctance motor drive control method and apparatus.

[0019]

According to a first aspect of the present invention, there is provided a compressor drive control method for controlling the drive of a compressor by a double salient pole reluctance motor supplied with an output of an inverter.
Detect the winding current phase of double salient pole reluctance motor,
In this method, a sine wave current is passed through the windings and the inverter is controlled so that the phase of the sine wave current waveform matches the predetermined rotor phase.

According to a second aspect of the compressor drive control method, the motor windings are connected in three phases and a sine wave voltage or a sine wave current is supplied to the double salient pole reluctance motor by an inverter. The compressor drive control method according to claim 3 employs a current source inverter as the inverter, detects the position of the rotor of the double salient pole reluctance motor, and advances the rotor position by a predetermined phase that maximizes the torque. In order to obtain the current phase by adding a predetermined phase to obtain the actual rotation speed of the double salient pole reluctance motor from the rotor position,
This is a method of performing speed control based on the actual rotation speed and the speed command to obtain a current amplitude command, and controlling the current source inverter based on the obtained current phase and current amplitude command.

According to another aspect of the compressor drive control method of the present invention, a voltage source inverter is used as the inverter, the rotor position of the double salient pole reluctance motor is detected, and the torque is maximized with respect to the rotor position. To obtain the current phase by adding a predetermined phase to advance only the phase, obtain the actual rotation speed of the double salient pole reluctance motor from the rotor position,
Performs speed control based on this actual rotation speed and speed command to obtain a current amplitude command, obtains each phase command current based on the obtained current phase and current amplitude command, and determines the motor current of the double salient pole reluctance motor. Is a method of controlling the output voltage of the voltage source inverter so as to follow a desired current command, based on the instantaneous value of and the phase command current.

A compressor drive control method according to a fifth aspect of the present invention employs a voltage type PWM inverter as an inverter, detects the rotor position of the double salient pole reluctance motor, and detects the rotor position and the double salient pole reluctance motor. The current phase is detected from the motor current, the voltage phase is determined from the current phase and the predetermined phase that maximizes the torque, and the actual rotation speed of the double salient pole reluctance motor is obtained from the rotor position. In this method, speed control is performed by a command to obtain a voltage control rate command, and the voltage-type PWM inverter is controlled based on the voltage phase and the voltage control rate command.

According to a sixth aspect of the present invention, there is provided a compressor drive control device for controlling the drive of a compressor by a double salient pole reluctance motor to which an output of an inverter is supplied, the winding current phase of the double salient pole reluctance motor. A winding current phase detection means for detecting the above, and an inverter control means for controlling the inverter so that the sinusoidal current is passed through the winding and the phase of the sinusoidal current waveform matches a predetermined rotor phase. I'm out.

According to a seventh aspect of the present invention, the compressor drive control device employs a double salient pole reluctance motor in which motor windings are connected in three phases, and the inverter applies a sine wave voltage or a sine wave current to the double salient poles. It uses the one that supplies the reluctance motor. The compressor drive control apparatus according to claim 8 adopts a current source inverter as an inverter, and rotor position detecting means for detecting the position of the rotor of the double salient pole reluctance motor, and maximum torque with respect to the rotor position. Current phase calculating means for adding a predetermined phase to obtain a current phase, and actual rotation speed calculating means for obtaining an actual rotation speed of the double salient pole reluctance motor from the rotor position. Current amplitude command calculation means for obtaining a current amplitude command by performing speed control based on the rotation speed and the speed command; and current source inverter control means for controlling the current source inverter based on the obtained current phase and current amplitude command. Is further included.

According to a ninth aspect of the present invention, the compressor drive control device employs a voltage source inverter as an inverter, and detects rotor position detecting means for detecting the position of the rotor of the double salient pole reluctance motor and the rotor position. A current phase calculating means for obtaining a current phase by adding a predetermined phase to advance a predetermined phase for maximizing the torque; and an actual rotation speed calculating means for obtaining an actual rotation speed of the double salient pole reluctance motor from the rotor position. , A current amplitude command calculation means for obtaining a current amplitude command by performing speed control based on the actual rotation speed and the speed command, and each phase command for obtaining each phase command current based on the obtained current phase and current amplitude command Based on the current calculation means, the instantaneous value of the motor current of the double salient pole reluctance motor and the command current of each phase, the output voltage of the voltage source inverter is made to follow the desired current command. Gosuru further comprising a voltage source inverter control means.

According to a tenth aspect of the present invention, the compressor drive control device employs a voltage type PWM inverter as an inverter, and has rotor position detecting means for detecting the position of the rotor of the double salient pole reluctance motor, the rotor position and the rotor position and the two positions. A current phase detecting means for detecting a current phase from a motor current of a heavy salient pole reluctance motor, a voltage phase determining means for determining a voltage phase from a current phase and a predetermined phase for maximizing torque, and a duplexer from the rotor position. An actual rotation speed calculation means for obtaining the actual rotation speed of the salient pole reluctance motor, a voltage control rate command calculation means for performing speed control by the actual rotation speed and the speed command to obtain a voltage control rate command, a voltage phase and a voltage control rate command Voltage PWM for controlling voltage PWM inverter based on
And inverter control means.

In the method for controlling driving of a double salient pole reluctance motor according to claim 11, the output of the inverter is supplied to the double salient pole reluctance motor having full-pitch winding to drive and control the double salient pole reluctance motor. In this method, the winding current phase of the double salient pole reluctance motor is detected, a sine wave current is passed through the winding, and the phase of the sine wave current waveform is made to match a predetermined rotor phase. This is a method of controlling the inverter.

A double salient pole reluctance motor drive controller according to claim 12 drives and controls the double salient pole reluctance motor by supplying the output of the inverter to the double salient pole reluctance motor having full pitch winding. And a winding current phase detecting means for detecting a winding current phase of a double salient pole reluctance motor, a sine wave current flowing through the winding, and a phase of the sine wave current waveform for a predetermined rotation. Inverter control means for controlling the inverter so as to match the child phase.

[0029]

According to the compressor drive control method of claim 1, when the compressor is driven and controlled by the double salient pole reluctance motor to which the output of the inverter is supplied, the winding current of the double salient pole reluctance motor is controlled. The phase is detected, a sine wave current is passed through the winding, and the inverter is controlled to match the phase of the sine wave current waveform with the predetermined rotor phase. Alternatively, even when the speed is increased, the waveform of the winding current is hardly distorted, and a sufficient winding current amplitude can be obtained. Further, since the phase of the winding current waveform is matched with the predetermined rotor phase, it is possible to suppress the generation of reverse torque,
As a result, the generated torque can be made approximately the same as in the case of extremely low speed (almost stopped), and the operating range of the compressor is expanded without increasing the rating of the double salient pole reluctance motor. be able to.

According to the compressor drive control method of claim 2,
Since the motor windings are connected in three phases and a sine-wave voltage or sine-wave current is supplied to the double salient pole reluctance motor by the inverter, the sine-wave current drive can be used to apply the three-phase connection. The line can be made half of the unipolar drive inverter, AC, DC
Inverter main circuit elements that are popular and easily available for motors can be used. As a result, it is possible to reduce the cost of the drive circuit unit together with the motor.

According to the compressor drive control method of claim 3,
The current source inverter is used as the inverter to detect the position of the rotor of the double salient pole reluctance motor and add the predetermined phase to advance the predetermined phase to maximize the torque with respect to the rotor position. Along with obtaining the actual rotation speed of the double salient pole reluctance motor from the rotor position, speed control is performed based on this actual rotation speed and the speed command to obtain a current amplitude command, and the obtained current phase and current Since the current source inverter is controlled based on the amplitude command, it is not necessary to provide a special motor current detection unit because the current source inverter has a part for controlling the current amplitude inside. The configuration of the control circuit unit can be simplified.

According to the compressor drive control method of claim 4,
A voltage source inverter is used as the inverter to detect the position of the rotor of the double salient pole reluctance motor and to add the predetermined phase to advance the predetermined phase that maximizes the torque relative to the rotor position, the current phase is calculated. Along with obtaining the actual rotation speed of the double salient pole reluctance motor from the rotor position, speed control is performed based on this actual rotation speed and the speed command to obtain a current amplitude command, and the obtained current phase and current Each phase command current is obtained based on the amplitude command, and the output voltage of the voltage-source inverter follows the desired current command based on the instantaneous value of the motor current of the double salient pole reluctance motor and each phase command current. Since it is controlled, it is possible to use a voltage source inverter that has a simple main circuit configuration and is often used in home appliances, compared to the case where a current source inverter is used. That.

According to the compressor drive control method of claim 5,
A voltage-type PWM inverter is used as the inverter to detect the rotor position of the double salient pole reluctance motor, detect the current phase from the rotor position and the motor current of the double salient pole reluctance motor, and calculate the current phase and torque. The voltage phase is determined from the predetermined phase to be maximized, the actual rotation speed of the double salient pole reluctance motor is obtained from the rotor position, and the voltage control rate command is obtained by performing speed control with the actual rotation speed and the speed command. Since the voltage-type PWM inverter is controlled based on the voltage phase and the voltage control rate command, only the current phase needs to be controlled by the voltage-type PWM inverter, which simplifies the control circuit and the main circuit, and also provides an inexpensive current phase. A detection element can be used.

According to the compressor drive controller of claim 6,
When controlling the compressor with the double salient pole reluctance motor supplied with the output of the inverter, the winding current phase detection means detects the winding current phase of the double salient pole reluctance motor, and the inverter control means It is possible to control the inverter so that the sinusoidal current is passed through the winding and the phase of the sinusoidal current waveform is matched with the predetermined rotor phase. Therefore, even if the rotation speed of the compressor becomes medium or high, the waveform of the winding current is hardly distorted, and a sufficient winding current amplitude can be obtained. Further, since the phase of the winding current waveform is matched with the predetermined rotor phase, it is possible to suppress the generation of reverse torque, and as a result, when the generated torque is extremely low speed (in the almost stopped state, ), The operating range of the compressor can be expanded without increasing the rating of the double salient pole reluctance motor.

According to the compressor drive controller of claim 7,
As the double salient pole reluctance motor, the one that connects the motor windings in three phases is adopted, and the one that the inverter supplies the sine wave voltage or sine wave current to the double salient pole reluctance motor is adopted. By applying wave current drive, three-phase connection can be applied, and the lead wire of the inverter can be half of that of the unipolar drive inverter.
Inverter main circuit elements that are widely used and easily available for C and DC motors can be used. As a result, it is possible to reduce the cost of the drive circuit unit together with the motor.

According to the compressor drive controller of claim 8,
A current source inverter is used as the inverter, the rotor position detection means detects the position of the rotor of the double salient pole reluctance motor, and the current phase calculation means uses only a predetermined phase to maximize the torque with respect to the rotor position. To advance, a predetermined phase is added to obtain the current phase, the actual rotation speed calculation means obtains the actual rotation speed of the double salient pole reluctance motor from the rotor position, and the current amplitude command calculation means obtains this actual rotation speed. Based on the speed command and the speed command, a current amplitude command is obtained, and the current source inverter control means controls the current source inverter based on the obtained current phase and current amplitude command. Therefore, because the current source inverter has a portion for controlling the current amplitude inside thereof, there is no need to provide a special motor current detection portion, and the configuration of the control circuit portion can be simplified.

According to the compressor drive controller of claim 9,
A voltage source inverter is used as the inverter, the rotor position detection means detects the rotor position of the double salient pole reluctance motor, and the current phase calculation means uses only a predetermined phase that maximizes the torque relative to the rotor position. To advance, a predetermined phase is added to obtain the current phase, the actual rotation speed calculation means obtains the actual rotation speed of the double salient pole reluctance motor from the rotor position, and the current amplitude command calculation means obtains this actual rotation speed. And a speed command to obtain a current amplitude command, and each phase command current calculation means obtains a command current for each phase based on the obtained current phase and current amplitude command, and voltage source inverter control means The output voltage of the voltage source inverter based on the instantaneous value of the motor current of the double salient pole reluctance motor and the command current of each phase. To control so as to follow the. Therefore, compared to the case of adopting a current source inverter,
The main circuit configuration is simple and the voltage source inverter that is often used in home appliances can be used.

According to the compressor drive controller of the tenth aspect, a voltage source PWM inverter is adopted as the inverter, and the rotor position detecting means detects the position of the rotor of the double salient pole reluctance motor to detect the current phase. The means detects the current phase from the rotor position and the motor current of the double salient pole reluctance motor, and the voltage phase determination means determines the voltage phase from the current phase and the predetermined phase that maximizes the torque, and the actual rotation speed. The calculation means obtains the actual rotation speed of the double salient pole reluctance motor from the rotor position, and the voltage control rate command calculation means performs the speed control with the actual rotation speed and the speed instruction to obtain the voltage control rate command, The voltage inverter control means controls the voltage PWM inverter based on the voltage phase and the voltage control rate command. Therefore, only the current phase needs to be controlled by the voltage-type PWM inverter, the control circuit and the main circuit can be simplified, and an inexpensive current phase detection element can be used.

According to the double salient pole reluctance motor drive control method of the eleventh aspect, the double salient pole reluctance motor is supplied by supplying the output of the inverter to the double salient pole reluctance motor having full-pitch winding. During drive control, the winding current phase of the double salient pole reluctance motor is detected, a sine wave current is passed through the winding, and the phase of the sine wave current waveform is made to match the predetermined rotor phase. Since the inverter is controlled in this way, even when the rotation speed of the double salient pole reluctance motor becomes medium speed or high speed, the winding current waveform is hardly distorted and a sufficient winding current amplitude is obtained. Obtainable. Moreover, since the phase of the winding current waveform is matched with the predetermined rotor phase, it is possible to suppress the generation of reverse torque, and as a result,
The generated torque can be made approximately the same as in the case of extremely low speed (almost stopped), and the operating range of the double salient pole reluctance motor can be expanded without increasing the rating. Also, in the double salient pole reluctance motor with full-pitch winding, the distribution of inductance becomes more sinusoidal than that with concentrated winding.
Torque ripple reduction can also be achieved.

According to the double salient pole reluctance motor drive control device of the twelfth aspect, the output of the inverter is supplied to the double salient pole reluctance motor having full pitch windings, whereby the double salient pole reluctance motor is provided. In drive control, the winding current phase detection means detects the winding current phase of the double salient pole reluctance motor, and the inverter control means causes a sine wave current to flow through the winding and the phase of the sine wave current waveform. The inverter can be controlled to match the with a predetermined rotor phase. Therefore, even when the rotation speed of the double salient pole reluctance motor becomes medium speed or high speed, the waveform of the winding current is hardly distorted, and a sufficient winding current amplitude can be obtained. Further, since the phase of the winding current waveform is matched with the predetermined rotor phase, it is possible to suppress the generation of reverse torque, and as a result, when the generated torque is extremely low speed (in the almost stopped state, ), The operating range of the double salient pole reluctance motor can be expanded without increasing the rating. Further, in the double salient pole reluctance motor having the full-pitch winding, the distribution of the inductance becomes more sinusoidal than that of the concentrated salient winding motor, so that the torque ripple can be reduced.

Further description will be made. Conventionally, the sinusoidal current drive method has been considered unsuitable for drive control of a double salient pole reluctance motor because it has a problem that negative torque is generated. However, the inventor of the present application has completed the invention of the present application by paying attention to the simplicity of control of the winding current amplitude and phase at the medium speed to high speed rotation in the sinusoidal current driving method.

[0042]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a compressor drive control device of the present invention.
This apparatus includes a compressor 1, a DSR motor 2 having a rotary shaft connected to the rotary shaft of the compressor 1, an inverter 3 for supplying a sinusoidal current or a sinusoidal voltage to the DSR motor 2, and a DSR motor. A winding current detecting unit 4 for detecting a motor winding current of the motor 2, a rotor position detecting unit 5 for detecting a position of a rotor of the DSR motor 2, a detected motor winding current and a detected rotor. An inverter control unit 6 that controls the inverter 3 so that the phase of the sinusoidal current waveform that flows through the motor windings matches the predetermined rotor phase, using the position and the input as input.

According to this compressor drive control device, the winding current detector 4 detects the motor winding current of the DSR motor 2 and the rotor position detector 5 detects DSR.
The position of the rotor of the motor 2 is detected, and the inverter control unit 6
By using the detected motor winding and the detected rotor position as input, the inverter 3 is controlled so that the phase of the sinusoidal current waveform flowing through the motor winding matches the predetermined rotor phase. Then, the inverter 3 can supply the sine wave current to the DSR motor 2 to drive the DSR motor 2, and the DSR motor 2 can drive the compressor 1.

Here, the DSR motor 2 may be one in which concentrated winding is applied, or one in which full-pitch winding is applied. However, it is preferable to employ a coil having a full-pitch winding, and in this case, it is possible to suppress the generation of reverse torque and increase the generated torque as a whole. Next, a more detailed description will be given with reference to the changes in the inductance change rate waveform, the current waveform, the current product waveform, and the torque waveform shown in FIGS. In FIGS. 2 and 3, focusing on the fundamental wave component of the inductance distribution,
Moreover, only the torque generated by the a-phase current is shown. 2 shows the case where the phase of the sine wave current waveform does not match the predetermined rotor phase, and FIG. 3 shows the case where the phase of the sine wave current waveform matches the predetermined rotor phase. The case is shown.

A-phase self-inductance change rate waveform {Fig. 2
The middle (A) reference} is given by the equation 4. However, L is the peak value of the change in self-inductance.

[0046]

(Equation 4)

Further, the a-phase motor winding current ia {see (B) in FIG. 2} is ia = Im · cos (θ / 2 + φ / 2)
(Im is the peak value of the motor winding current), and the current product {see (B) in FIG. 2} is given by ia ² . Therefore, the torque τa generated by the a-phase motor winding current ia is given by Equation 5. However, φ is a phase for matching the phase of the sine wave current waveform with a predetermined rotor phase.

[0048]

(Equation 5)

The output torque τ of the DSR motor is the torques τb and τc generated by the b-phase current and the c-phase current, respectively.
Is obtained in the same manner and Equation 2 is applied to obtain Equation 6.

[0050]

(Equation 6)

From Expression 6, the influence of the reverse torque can be minimized at the current phase φ = π / 2 regardless of the rotation speed of the DSR motor and the amplitude of the motor winding current. The average torque of the phases can be increased and the output torque can be maximized. In order to realize the above control, it is most preferable to detect the phase of the fundamental wave component that generates the average torque. However, because a signal processing circuit is required and the motor winding inductance is large, the harmonic current Considering that there is little phase shift due to
Even if it is regarded as the phase of the sinusoidal current waveform from the zero crossing of the motor winding current, almost the same operational effects are obtained.

In the above, the torque generated by the fundamental wave current is considered. Next, consider the torque generated by the harmonic current. aah harmonic current iah
(However, if h = 2k, k = 1, 2, 3, ...), iah = Imh · cos {(h / 2) (θ + φ
h)} (Imh is the peak value of the motor winding harmonic current). The torque τah generated by the a-phase harmonic current iah is given by the equation 7. However, h / φh /
2 is the phase of the harmonic current waveform.

[0053]

(Equation 7)

As for the output torque τh of the DSR motor due to the harmonic current, the torques τbh and τch generated by the b-phase harmonic current and the c-phase harmonic current are similarly obtained,
By applying the equation 2, the equation 8 is obtained.

[0055]

(Equation 8)

Therefore, the torque generated by the harmonic current is torque ripple, but the average torque is zero.
Further, in this embodiment, an inverter shown in FIG.
The bipolar drive inverter shown in can be adopted. FIG. 4 is a block diagram showing an embodiment of the DSR motor drive control device of the present invention.

This device differs from the device of FIG. 1 in that the DS
The only difference is that the R motor 2 employs a full-pitch winding instead of the concentrated winding, and that the compressor is omitted. Therefore, an operation similar to that of the compressor drive control device of FIG. 1 can be achieved.

Next, a more detailed description will be given with reference to the inductance change rate waveform, the current waveform, the current product waveform, and the torque waveform shown in FIGS. 5 and 6, attention is paid to the fundamental wave component of the inductance change rate waveform, and only the torque generated by the a-phase current is shown. Further, FIG. 5 shows the case where the phase of the sine wave current waveform does not match the predetermined rotor phase, and FIG. 6 shows the case where the phase of the sine wave current waveform matches the predetermined rotor phase. The case is shown.

The a, b-phase mutual inductance change rate waveform {see a in FIG. 5 (A)} is given by equation (9). However, M is the peak value of the change in mutual inductance.

[0060]

[Equation 9]

The a-phase motor winding current ia {see (B) in FIG. 5} is ia = Imcos (θ / 2 + φ / 2)
And the b-phase motor winding current ib {(B in FIG. 5)
Reference} is ib = Im · cos (θ / 2 + φ / 2-2π /
3), the current product {see (B) in FIG. 5} is ia
given in ib. Therefore, the torque τab generated by the a-phase motor winding current ia and the b-phase motor winding current ib is given by Equation 10.

[0062]

(Equation 10)

The output torque τ of the DSR motor is obtained by similarly obtaining the torques τbc and τca generated by the b-phase current and the c-phase current, the c-phase current and the a-phase current, respectively, and applying the equation 3 to obtain the equation 11 Become.

[0064]

[Equation 11]

From Expression 11, the influence of the reverse torque can be minimized at the current phase φ = 7π / 6 regardless of the rotation speed of the DSR motor and the motor winding current amplitude, and 1 shown by c in FIG. 6 (C).
The average torque of the phases can be increased and the output torque can be maximized. In addition, the self-inductance distribution of the DSR motor that has been concentratedly wound by the prototype,
When the mutual inductance distribution of the DSR motor with full-pitch winding is measured, it becomes as shown in Fig. 7 (A) and (B). By using the DSR motor with full-pitch winding, It was found that the inductance distribution can be made more sinusoidal and the torque ripple reducing effect can be obtained as compared with the case where the wound DSR motor is adopted.

In the above, the torque generated by the fundamental wave current is considered. Next, consider the torque generated by the harmonic current. Concentrated winding DSR
If the torque τh caused by the harmonic current of the DSR motor, which is obtained by performing full-pitch winding in the same manner as the torque caused by the harmonic current of the motor, is obtained, formula 12 is obtained.

[0067]

(Equation 12)

Therefore, the torque generated by the harmonic current is torque ripple, but the average torque is zero.
Further, in this embodiment, an inverter shown in FIG.
The bipolar drive inverter shown in can be adopted. FIG. 9 is a block diagram showing another embodiment of the compressor drive control device of the present invention.

This device has a current amplitude command | I * |
The sine wave current is supplied to the DSR motor 12 by the current source inverter 11 which receives the current phase command θ * and
The SR motor 12 is drive-controlled. Then, a rotor encoder directly connected to the rotor shaft or a rotor position detection unit 13 that detects the rotor position θ by using a motor terminal voltage or a neutral point potential, and a DSR using the detected rotor position θ as input. A speed calculation unit 14 that calculates the rotation speed ω of the motor, and a subtraction unit 15 that calculates the rotation speed deviation by subtracting the rotation speed ω calculated from the rotation speed command ω *.
And a speed control unit 16 which performs speed control processing by inputting the calculated rotation speed deviation to calculate a current amplitude command | I * | and supplies it to the current source inverter 11, the detected rotor position θ and torque. With a predetermined phase φ * that maximizes the current phase command θ *, and supplies the current phase command θ * to the current source inverter 11. It also has a compressor 10 driven by a DSR motor 12.

Therefore, in this embodiment, the rotation speed ω is calculated by the speed calculator 14 based on the rotor position θ detected by the rotor position detector 13. Then, the subtraction unit 15 calculates the deviation between the rotation speed command and the calculated rotation speed, and the speed control unit 16 obtains the current amplitude command | I * |. In addition, the detected rotor position θ
And the predetermined phase φ * that maximizes the torque are added in the adder 17 to obtain the current phase command θ *. Then, these current amplitude command | I * | and current phase command θ *
Is supplied to the current source inverter 11, the generation of reverse torque can be significantly suppressed, and the average torque for one phase of the DSR motor 12 can be increased. Therefore, the operating range of the compressor can be expanded.

When this embodiment is adopted, since the current source inverter has a portion for controlling the current amplitude inside thereof, it is not necessary to add a new winding current detecting portion, and the control circuit (inverter The configuration of the control circuit) can be simplified. FIG. 10 is a block diagram showing still another embodiment of the compressor drive control device of the present invention.

This device differs from the compressor drive control circuit shown in FIG. 9 in that a voltage source inverter 11 'is adopted in place of the current source inverter 11, and a winding current detector 18 for detecting a motor winding current is provided. The point where the current amplitude command | I * | and the current phase θ * are input, and the phase command current generator 19 that outputs the command current for each phase is provided. The command current for each phase and the detected motor winding current And a current control unit 21 that controls the output voltage of the voltage source inverter 11 ′ so as to follow the current command by performing current control using the point where a subtraction unit 20 that calculates the deviation is provided, and the calculated deviation as an input. It is only the point that is provided.

Therefore, in the case of this embodiment, the rotation speed ω is calculated by the speed calculator 14 based on the rotor position θ detected by the rotor position detector 13. Then, the subtraction unit 15 calculates the deviation between the rotation speed command and the calculated rotation speed, and the speed control unit 16 obtains the current amplitude command | I * |. In addition, the detected rotor position θ
And the predetermined phase φ * that maximizes the torque are added in the adder 17 to obtain the current phase θ *. And
By supplying the current amplitude command | I * | and the current phase θ * to the command current generator 19 for each phase, the command current for each phase is obtained. The difference between the command current of each phase and the motor winding current detected by the winding current detector 18 is supplied to the subtractor 20, and the obtained difference is supplied to the current controller 21. Therefore, the voltage source inverter 1
The output voltage of 1 ′ can be controlled so as to follow the current command.

When this embodiment is adopted, the winding current detector 18 and the like need to be added, and therefore the configuration of the control circuit becomes slightly complicated as compared with the embodiment of FIG. Is simpler than the current type inverter, and the voltage type inverter often used in home appliances and industrial equipment can be used. FIG. 11 is a block diagram showing still another embodiment of the compressor drive control device of the present invention.

The difference between this device and the compressor drive control device of FIG. 9 is that a winding current detector 18 for detecting the motor winding current of the DSR motor is provided, and it is detected by the rotor position detector 13. A torque phase is maximized in place of the adder 17 in that a current phase detector 22 for detecting the current phase φ is provided with the rotor position θ and the motor winding current detected by the winding current detector 18 as inputs. A point provided with a subtraction unit 17 ′ for subtracting the detected current phase φ from the predetermined phase φ *, the voltage phase θ * using the phase output from the subtraction unit 17 ′ as an input
The point where the phase control unit 23 for outputting
In place of the voltage control rate Ks *
In place of the current source inverter 11 and a point provided with a speed control unit 16 'for outputting the voltage control rate Ks * and the voltage phase θ *, the voltage source PWM inverter 11''
It is only the point that is provided.

When the output line voltage of the voltage source inverter is V1, the DC voltage is Vdc, and the voltage control rate is Ks *, there is a relationship of V1 = Ks * .Vdc / ^21/2 ("induction machine"). Regarding PWM control patterns and harmonic analysis of general-purpose inverters for driving ", Ohue, Tsunehiro, Imai, Hosono, Denki Theory D, 109-11, 1989). Therefore, in this embodiment, the speed calculator 14 obtains the rotation speed ω based on the rotor position θ detected by the rotor position detector 13, and the rotation speed command ω * and the obtained rotation speed ω are obtained. The voltage control rate Ks * can be obtained by supplying the deviation of 1 to the speed control unit 16 '. Further, by supplying the detected rotor position θ and the motor winding current detected by the winding current detection unit 18 to the current phase detection unit 22, the current phase φ can be detected and the torque can be maximized. By supplying the deviation between the predetermined phase φ * to be detected and the detected current phase φ to the phase controller 23, the voltage phase θ
You can get *.

Then, by supplying the obtained voltage control rate Ks * and voltage phase θ * to the voltage type PWM inverter 11 ″, the DSR is performed with the generated torque maximized.
The motor 12 can be driven. As a result, the operating range of the compressor can be expanded. When this embodiment is adopted, since only the current phase needs to be controlled by the voltage-type PWM inverter, the control circuit and the main circuit are simple, and an inexpensive current phase detection element such as a photocoupler is adopted. Therefore, the cost can be significantly reduced as a whole.

By adopting a fan in place of the compressor of any of the embodiments of FIGS. 1 and 9 to 11 or by driving the fan by the DSR motor of the embodiment of FIG. A drive controller can be obtained.

[0079]

According to the first aspect of the present invention, the waveform of the winding current is hardly distorted and a sufficient winding current amplitude can be obtained even when the rotation speed of the compressor becomes medium to high speed. In addition, since the phase of the winding current waveform is adjusted to the predetermined rotor phase, it is possible to suppress the generation of reverse torque, and as a result, when the generated torque is extremely low (almost stopped). It is possible to increase the operating range of the compressor without increasing the rating of the double salient pole reluctance motor.

According to the second aspect of the present invention, the three-phase connection can be applied by performing the sinusoidal current drive, and the lead wire of the inverter can be half of the inverter of the unipolar drive.
Inverter main circuit elements that are widely used and easily available for AC and DC motors can be used, and as a result, it is possible to reduce the cost of the drive circuit unit together with the motor.

According to the third aspect of the present invention, the current source inverter has a portion for controlling the current amplitude inside thereof, so that it is not necessary to provide a special motor current detecting portion.
It has a unique effect that the configuration of the control circuit unit can be simplified. The invention of claim 4 has a peculiar effect that the main circuit configuration is simple and the voltage type inverter often used in home electric appliances can be used as compared with the case of adopting the current type inverter.

According to the fifth aspect of the present invention, only the current phase needs to be controlled by the voltage type PWM inverter, so that the control circuit and the main circuit can be simplified, and an inexpensive current phase detecting element can be used. Play. According to the sixth aspect of the invention, the waveform of the winding current is hardly distorted and a sufficient winding current amplitude can be obtained even when the rotation speed of the compressor becomes medium to high speed. Since the phase of the winding current waveform is adjusted to the predetermined rotor phase, it is possible to suppress the generation of reverse torque, and as a result, the generated torque is extremely low speed (almost stopped). The same effect can be obtained, and the operating range of the compressor can be expanded without increasing the rating of the double salient pole reluctance motor.

According to the invention of claim 7, the three-phase connection can be applied by performing the sinusoidal current drive, and the lead wire of the inverter can be half of the inverter of the unipolar drive.
Inverter main circuit elements that are widely used and easily available for AC and DC motors can be used, and as a result, it is possible to reduce the cost of the drive circuit unit together with the motor.

According to the present invention of claim 8, the current source inverter has a portion for controlling the current amplitude inside thereof, so that it is not necessary to provide a motor current detecting portion.
It has a unique effect that the configuration of the control circuit unit can be simplified. The invention of claim 9 has a peculiar effect that the main circuit configuration is simple and a voltage type inverter often used in home electric appliances can be used as compared with the case of employing a current type inverter.

According to the tenth aspect of the invention, only the current phase needs to be controlled by the voltage type PWM inverter.
It has a unique effect that the main circuit can be simplified and an inexpensive current phase detection element can be used. According to the eleventh aspect of the present invention, even when the rotation speed of the double salient pole reluctance motor becomes medium to high, the waveform of the winding current is hardly distorted and a sufficient winding current amplitude can be obtained. Moreover, since the phase of the winding current waveform is adjusted to the predetermined rotor phase, it is possible to suppress the generation of reverse torque. As a result, when the generated torque is extremely low (almost stopped) The same level),
As a result, the operating range of the double salient pole reluctance motor can be expanded without increasing the rating.
The double salient pole reluctance motor with full-pitch winding has a more sinusoidal distribution of inductance than the concentrated winding, so it has the unique effect of reducing torque ripple. Play.

According to the twelfth aspect of the present invention, even when the rotation speed of the double salient pole reluctance motor becomes medium to high speed,
The waveform of the winding current is hardly distorted, a sufficient winding current amplitude can be obtained, and the phase of the winding current waveform is adjusted to a predetermined rotor phase, so that the reverse torque is generated. As a result, the generated torque can be made almost the same as in the case of extremely low speed (almost stopped), and the operation of the double salient pole reluctance motor can be performed without increasing the rating. The range can be expanded, and in the double salient pole reluctance motor with full-pitch winding, the inductance distribution becomes more sinusoidal than in the case with concentrated winding, which reduces torque ripple. It has a unique effect that it can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a compressor drive control device of the present invention.

FIG. 2 is a diagram showing an inductance change rate waveform, a current waveform, a current product waveform, and a torque waveform when the phase of the sine wave current waveform does not match the predetermined rotor phase.

FIG. 3 is a diagram showing an inductance change rate waveform, a current waveform, a current product waveform, and a torque waveform when the phase of a sine wave current waveform matches a predetermined rotor phase.

FIG. 4 is a block diagram showing an embodiment of a DSR motor drive control device of the present invention.

FIG. 5 is a diagram showing an inductance change rate waveform, a current waveform, a current product waveform, and a torque waveform when the phase of the sine wave current waveform does not match the predetermined rotor phase.

FIG. 6 is a diagram showing an inductance change rate waveform, a current waveform, a current product waveform, and a torque waveform when the phase of the sine wave current waveform matches a predetermined rotor phase.

FIG. 7 is a diagram showing measured values of inductance distribution of a DSR motor having concentrated winding and a DSR motor having full-pitch winding.

FIG. 8 is an electric circuit diagram showing an example of an inverter of a bipolar drive.

FIG. 9 is a block diagram showing another embodiment of the compressor drive control device of the present invention.

FIG. 10 is a block diagram showing still another embodiment of the compressor drive control device of the present invention.

FIG. 11 is a block diagram showing still another embodiment of the compressor drive control device of the present invention.

FIG. 12 is a vertical sectional view schematically showing the configuration of a DSR motor.

FIG. 13 is a diagram schematically showing a configuration of a DSR motor having concentrated winding.

14 is a diagram showing a self-inductance distribution, a winding current of each phase, a torque generated by each phase winding, and a combined torque of the DSR motor of FIG.

FIG. 15 is a diagram schematically showing a configuration of a DSR motor having full-pitch winding.

16 is a diagram showing a mutual inductance distribution, a winding current of each phase, a torque generated by each phase winding, and a combined torque of the DSR motor of FIG.

FIG. 17 is an electric circuit diagram showing an example of an inverter of a unipolar drive.

FIG. 18 is a diagram showing a change in winding current waveform and a change in generated torque waveform with an increase in rotation speed.

FIG. 19 is a diagram showing changes in winding current and changes in generated torque when the winding current command phase is advanced based on load information and rotation speed information.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compressor 2, 12 DSR motor 3 Inverter 4 Winding current detection part 6 Inverter control part 11 Current source inverter 11 'Voltage source inverter 11''Voltage source PWM
Inverter 13 Rotor position detector 14 Speed calculator 16, 16 'Speed controller 17 Adder 18 Winding current detector 19 Each phase command current generator 21 Current controller 22 Current phase detector 23 Phase controller

Claims (12)

[Claims] 1. A method for driving and controlling a compressor (1) by a double salient pole reluctance motor (2) supplied with an output of an inverter (3), comprising winding a double salient pole reluctance motor (2). A compressor characterized by detecting a line current phase, supplying a sine wave current to a winding, and controlling an inverter (3) so that the phase of the sine wave current waveform matches a predetermined rotor phase. Drive control method. 2. The compressor drive control method according to claim 1, wherein the motor windings are connected in three phases, and a sine wave voltage or a sine wave current is supplied to the double salient pole reluctance motor (2) by the inverter (3). . 3. The inverter (3) is a current source inverter (11), which detects a rotor position of a double salient pole reluctance motor (2) and has a predetermined phase for maximizing torque with respect to the rotor position. To obtain a current phase by adding a predetermined phase so as to advance only, the actual rotation speed of the double salient pole reluctance motor (2) is obtained from the rotor position, and speed control is performed based on this actual rotation speed and the speed command. 3. The compressor drive control method according to claim 1, wherein the current source inverter is controlled based on the obtained current phase and current amplitude command. 4. The double salient pole reluctance motor (2), wherein the inverter (3) is a voltage source inverter (11 ′).
Of the rotor, the current phase is obtained by adding a predetermined phase in order to advance a predetermined phase that maximizes the torque with respect to the rotor position, and a double salient pole reluctance motor ( 2) The actual rotation speed is obtained, speed control is performed based on this actual rotation speed and the speed command to obtain a current amplitude command, and each phase command current is obtained based on the obtained current phase and current amplitude command, The output voltage of the voltage source inverter (11 ') is controlled so as to follow a desired current command based on the instantaneous value of the motor current of the double salient pole reluctance motor (2) and the command current of each phase. Alternatively, the compressor drive control method according to claim 2. 5. The inverter (3) is a voltage type PWM inverter (11 ″), detects the rotor position of the double salient pole reluctance motor (2), and detects the rotor position and the double salient pole reluctance motor. The current phase is detected from the motor current in (2), the voltage phase is determined from the current phase and a predetermined phase that maximizes torque, and the actual rotation speed of the double salient pole reluctance motor (2) is determined from the rotor position. 3. The method according to claim 1, wherein the speed control is performed based on the actual rotation speed and the speed command to obtain the voltage control rate command, and the voltage type PWM inverter (11 ″) is controlled based on the voltage phase and the voltage control rate command. The compressor drive control method described in 1. 6. A device for driving and controlling a compressor (1) by a double salient pole reluctance motor (2) supplied with an output of an inverter (3), the winding of the double salient pole reluctance motor (2). A winding current phase detecting means (4) for detecting a line current phase, and a sine wave current flowing through the winding, and controlling an inverter so that the phase of the sine wave current waveform matches a predetermined rotor phase. A compressor drive control device comprising an inverter control means (6). 7. The double salient pole reluctance motor (2) is configured by connecting motor windings in three phases, and the inverter (3) outputs a sine wave voltage or a sine wave current to the double salient pole reluctance motor (2). 7. The compressor drive control device according to claim 6, which supplies the compressor drive control device. 8. The double salient pole reluctance motor (12), wherein the inverter (3) is a current source inverter (11).
Position detecting means (13) for detecting the position of the rotor
A current phase calculating means (17) for obtaining a current phase by adding a predetermined phase in order to advance a predetermined phase for maximizing the torque with respect to the rotor position; and a double salient pole reluctance motor (from the rotor position). An actual rotation speed calculation means (14) for obtaining the actual rotation speed of 12), a current amplitude command calculation means (16) for obtaining a current amplitude command by performing speed control based on the actual rotation speed and the speed command. 7. A current source inverter control means for controlling the current source inverter (11) on the basis of the current phase and current amplitude commands thus obtained.
Alternatively, the compressor drive control device according to claim 7. 9. The double salient-pole reluctance motor (1) is characterized in that the inverter (3) is a voltage source inverter (11 ′).
2) Rotor position detecting means (1) for detecting the position of the rotor
3), a current phase calculating means (17) for obtaining a current phase by adding a predetermined phase for advancing a predetermined phase that maximizes the torque with respect to the rotor position, and double salient pole reluctance from the rotor position. An actual rotation speed calculation means (14) for obtaining an actual rotation speed of the motor (12), and a current amplitude command calculation means (16) for obtaining a current amplitude command by performing speed control based on the actual rotation speed and the speed command. , Each phase command current calculating means (19) for obtaining each phase command current based on the obtained current phase and current amplitude command, the instantaneous value of the motor current of the double salient pole reluctance motor (12) and each phase command current The voltage source inverter control means (21) for controlling the output voltage of the voltage source inverter (11 ') so as to follow a desired current command based on
The compressor drive control device according to. 10. An inverter (3) is a voltage type PWM inverter (11 ″), and rotor position detecting means (13) for detecting the position of the rotor of a double salient pole reluctance motor (12); Current phase detection means (22) for detecting the current phase from the child position and the motor current of the double salient pole reluctance motor, and voltage phase determination means (2) for determining the voltage phase from the current phase and a predetermined phase that maximizes torque.
3) and the actual rotation speed calculation means (1) for obtaining the actual rotation speed of the double salient pole reluctance motor (12) from the rotor position.
4), and a voltage control rate command calculation means (1) that obtains a voltage control rate command by performing speed control based on the actual rotation speed and the speed command.
6 ′) and a voltage source P for controlling the voltage source PWM inverter (11 ″) based on the voltage phase and the voltage control rate command.
The compressor drive control device according to claim 6 or 7, further comprising WM inverter control means. 11. A method of driving and controlling a double salient pole reluctance motor (2) by supplying the output of an inverter (3) to a double salient pole reluctance motor (2) having full-pitch winding. , The winding current phase of the double salient pole reluctance motor (2) is detected, a sine wave current is passed through the winding, and the inverter is arranged to match the phase of the sine wave current waveform with a predetermined rotor phase. A double salient pole reluctance motor drive control method characterized by controlling (3). 12. An apparatus for driving and controlling a double salient pole reluctance motor (2) by supplying the output of an inverter (3) to a double salient pole reluctance motor (2) having full pitch winding. Then, the winding current phase detecting means (4) for detecting the winding current phase of the double salient pole reluctance motor (2), the sine wave current flowing through the winding, and the phase of the sine wave current waveform are predetermined. A double salient pole reluctance motor drive control device comprising: an inverter control means (6) for controlling the inverter (3) so as to match the rotor phase.