JP2000050687A - Driving gear for multiple-winding motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration and noise without making a reactor larger in size by feeding power to windings arranged in a same slot of the stator of a motor, and by displacing the phase of high harmonics to each other between inverters. SOLUTION: This drive gear is provided with a n-fold-winding motor 1 having n (an integer of 2 or larger) sets of m (an integer of 2 or larger)-phase windings, n pieces of m-phase inverters 21, 22 to be controlled by a PWM system, and a reactor 3 inserted between the windings of the motor 1 and inverters 21, 22. Power is fed to each of the n-pieces of windings in each slot of the stator of the motor from other inverters. Then, the phase of the carrier signals of the inverters 21, 22 for the PWM control is displaced with respect to each other by 360 deg./n. This makes the higher harmonics of a magnetomotive force counterbalanced to each other by the winding and control methods. Thus, the reduction of the higher-harmonic magnetomotive force can achieve reduction in vibration and noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter-powered multi-winding motor drive device, and more particularly to a low vibration and low noise motor drive device.

[0002]

2. Description of the Related Art Generally, when power is supplied to an inverter, harmonics are generated by the switching of the inverter, and the motor generates vibration and noise due to the harmonics. A first method for reducing the vibration and noise is to increase the frequency of a carrier signal used for pulse width (PWM) modulation of an inverter (hereinafter, simply referred to as carrier frequency). As a second method, there is a method of reducing a current harmonic by inserting a reactor between the inverter and the motor winding. One example is shown in FIG.
145870).

As shown in the figure, the motor comprises a three-phase two-multiplex motor 1 having two sets of three-phase windings, two three-phase inverters 21 and 22 for supplying power to each three-phase winding, and a coupling reactor 3. The two sets of three-phase windings are supplied with power by separate three-phase inverters 21 and 22, respectively. The coupling reactors 3 are connected such that the turns ratio is 1: 1 between the same phases, and the magnetic fluxes of the fundamental wave components are canceled each other. Since the fundamental wave components are controlled in the same phase in both magnitude and phase, they do not operate as reactors. On the other hand, by controlling the phases of the harmonics in opposite phases between the two inverters (see inverter 5), a magnetic flux of a harmonic component is generated in the reactor core,
It operates as a reactor for harmonic components. Since only the magnetic flux of the harmonic component is generated in the reactor core,
The reactor can be significantly reduced in size. Further, since the reactor does not operate with respect to the fundamental wave component, even if the reactor is inserted, the power factor does not decrease and the inverter capacity does not increase. From the above, a low-vibration, low-noise, and compact multiple motor drive device can be realized.

[0004]

However, when the carrier frequency is increased, the loss of the inverter element increases, which causes a problem of a decrease in inverter efficiency and an increase in size. In a large-capacity drive device, the upper limit of the carrier frequency is often limited by the capability of the switching element.
There is a problem that noise cannot be sufficiently reduced. Assuming that the winding configuration in FIG. 6 is an adjacent-pole connection with a small mutual magnetic coupling as shown in FIG. 7, for example, a magnetomotive force harmonic proportional to the current harmonic is generated from each slot. Therefore, to increase the effect of reducing vibration and noise, it is necessary to increase the inductance of the reactor.
There is a problem that the reactor becomes large. Therefore, an object of the present invention is to reduce vibration and noise without increasing the size of the reactor.

[0005]

In order to solve such a problem, according to the first aspect of the present invention, n (an arbitrary integer of 2 or more)
An n-fold winding motor having a set of m (arbitrary integer of 2 or more) phase windings and an n controlled by a pulse width (PWM) modulation method
M-phase inverters and a reactor inserted between the windings of the motor and the inverter, and the n windings of each slot of the motor stator are supplied with power from separate inverters, respectively. The phases of carrier signals for performing PWM modulation of the inverter are shifted from each other (360 ° / n). In the invention of claim 1,
As the reactor, a coupled reactor having a plurality of windings having the same number of turns on the same iron core and connected so that the magnetomotive forces of the output current fundamental wave components of the inverter cancel each other can be used. ).

According to a third aspect of the present invention, an n-fold winding motor having n (arbitrary integers of 2 or more) sets of m (arbitrary integers of 2 or more) phase windings and a pulse width (PWM) modulation method are used. And a reactor inserted between the windings of the motor and the inverter, and the n windings of each slot of the motor stator have n windings. Power is supplied from separate inverters, and P
The phases of carrier signals for performing WM modulation are shifted from each other (180 ° / n). This claim 3
In the present invention, a coupled reactor having a plurality of windings having the same number of turns on the same iron core and connected so that the magnetomotive forces of the output current fundamental wave components of the inverter cancel each other can be used as the reactor ( The invention of claim 4).

[0007]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention. This is one of the three-phase two-multiplex motors.
The motor winding configuration for each phase is shown in detail, and the power supply method is the same as that in FIG. As shown in the figure, the windings are two-layer windings and pole-connected, and two or more windings are arranged in the same slot to make the magnetic coupling between the two or more windings dense. Power is supplied to the two windings from the other inverters 21 and 22 having the same phase. Reference numeral 4 denotes a triangular wave transmitter as a carrier signal transmitter, and reference numeral 5 denotes an inverter.

FIG. 2 is a diagram illustrating the principle of the present invention. Since the current fundamental wave is controlled to the same value for both windings, the fundamental component of the magnetomotive force is synthesized (see the dotted line). On the other hand, harmonic components of the magnetomotive force cancel each other out by the winding method and the control method. As a result, the harmonic magnetomotive force is greatly reduced in the entire slot, and low vibration and low noise can be realized. When this example is compared with the case where the winding of FIG. 7 is adopted, in this example, the magnetomotive force harmonic component is canceled in all the slots, whereas in the case of the winding of FIG. Since some slots do not cancel, the magnetomotive force harmonics generated in the motor are smaller in this case,
The effect of reducing vibration and noise is also large. Further, even if the current harmonic is large, the harmonic magnetomotive force generated from the entire slot does not increase, so that there is no need to reduce the current harmonic, and the reactor can be downsized, and the entire drive device can be downsized.

FIG. 3 shows an example in which the winding configuration is a wave winding. As in the case of FIG. 1, two multiplex windings are arranged in the same slot, and power is supplied from different inverters. In addition, by controlling the phase of the harmonic to the opposite phase, the magnetomotive force harmonic component is canceled in all slots, so that vibration and noise can be reduced.

FIG. 4 shows a second embodiment of the present invention. This is an example in which a three-phase two-multiplex motor is supplied with power from three-phase single-phase inverter groups (group 1 and group 2). The principle of vibration and noise reduction and the configuration of the motor winding and the coupling reactor are the same as those in FIGS. However, since the frequency component of the output harmonic of the inverter is different from that of the three-phase inverter, the phase difference of the carrier signal is controlled to 90 ° between the two inverter groups.

In FIGS. 1, 3 and 4, the reactor has a plurality of windings having the same number of turns on the same iron core and is connected to cancel out the magnetomotive force of the fundamental wave component of the output current of the inverter. Fig. 5
It is also possible to use a normal reactor 3A such as Even with such a configuration, vibration and noise can be reduced.

Although the three-phase two-multiple winding motor drive device has been described above, the present invention can also be applied to a three-phase n (two or more integer) multiple-winding motor drive device. That is, n windings are arranged in the same slot of the motor stator, and power is supplied from another inverter of the same phase. In the case of three-phase inverter power supply, the phase difference of the carrier signal between the n inverters is calculated. (360 ° / n) or (180 ° / n) in the case of single-phase inverter power supply, low vibration and low noise can be realized by the same principle. Of course, the present invention can be applied to a polyphase motor such as a six-phase motor.

[0013]

According to the present invention, power is supplied from a plurality of inverters to a plurality of windings arranged in the same slot of a motor stator, and the phases of harmonics are shifted between the inverters. Harmonic components of the magnetomotive force generated from the windings are canceled between the multiple windings in the same slot, and a low-vibration, low-noise, and compact motor drive device can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the principle of the present invention.

FIG. 3 is a configuration diagram showing a modification of FIG. 1;

FIG. 4 is a configuration diagram showing a second embodiment of the present invention.

FIG. 5 is a configuration diagram showing a third embodiment of the present invention.

FIG. 6 is a configuration diagram showing a conventional example.

FIG. 7 is a configuration diagram illustrating an example of a winding configuration in FIG. 6;

[Explanation of symbols]

1 ... 3 phase 2 multiplex winding motor, 21, 22 ... 3 phase inverter, 3, 3A ... reactor, 4 ... triangular wave oscillator, 5 ... inverter.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H007 AA08 BB06 CA01 CB02 CC04 CC23 EA13 5H576 BB03 BB04 DD02 EE11 HB02 HB05

Claims (4)

[Claims] An n-winding motor having n (arbitrary integers of 2 or more) m-phase windings (arbitrary integers of 2 or more) and n controlled by a pulse width (PWM) modulation method M-phase inverters and a reactor inserted between the windings of the motor and the inverter, and the n windings of each slot of the motor stator are supplied with power from separate inverters, respectively. A multi-winding motor drive device wherein the phases of carrier signals for performing PWM modulation of an inverter are shifted from each other (360 ° / n). 2. A combined reactor having a plurality of windings having the same number of turns on the same iron core and connected so that magnetomotive forces of an output current fundamental wave component of an inverter cancel each other, is used as the reactor. The multiple winding motor drive device according to claim 1. 3. An n-winding motor having n (arbitrary integers of 2 or more) sets of m (arbitrary integers of 2 or more) phase windings, and n controlled by a pulse width (PWM) modulation method. The motor comprises a single-phase inverter for m phases, and a reactor inserted between the winding of the motor and the inverter. The n windings of each slot of the motor stator each have a different inverter. A multi-winding motor drive device, characterized in that the phases of carrier signals for feeding power and performing PWM modulation of the inverter are shifted from each other (180 ° / n). 4. A combined reactor having a plurality of windings having the same number of turns on the same iron core and connected so that magnetomotive forces of fundamental wave components of an output current of an inverter cancel each other out, is used as the reactor. The multiple winding motor drive device according to claim 3.