Control device of rotary electric machine and control method of the same

Patent metadata

Field	Value
Publication number	US-11211883-B2
Application number	US-201816496227-A
Country	US
Kind code	B2
Filing date	Jan 29, 2018
Priority date	Mar 29, 2017
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

An object of the invention is to reduce a torque pulsation. A control device of a rotary electric machine according to the invention includes a sinusoidal wave generation circuit which generates a sinusoidal wave signal according to a magnetic pole position of a rotor of the rotary electric machine, a current command circuit which generates a speed command, a torque command based on actual speed information, and a current command on the basis of the sinusoidal wave signal, and a current control circuit which controls an inverter circuit interposed between a stator winding and a DC power source to make a sinusoidal current flow to the stator winding on the basis of the current command and a current detection signal of the stator winding of the rotary electric machine, wherein the current control circuit periodically changes a current phase of the sinusoidal current when the rotary electric machine is driven by a predetermined torque and a predetermined rotation frequency.

First claim

The invention claimed is:

1. A control device of a rotary electric machine, comprising:
a sinusoidal wave generation circuit configured to generate a flux sinusoidal wave signal according to a magnetic pole position of a rotor of the rotary electric machine;
a current command circuit configured to generate a speed command, a torque command based on actual speed information, and a current command on the basis of the sinusoidal wave signal; and
a current control circuit configured to control an inverter circuit interposed between a stator winding and a DC power source to make a sinusoidal current flow to the stator winding on the basis of the current command and a current detection signal of the stator winding of the rotary electric machine,
wherein the current control circuit is configured to periodically change a current phase of the sinusoidal current when the rotary electric machine is driven by a predetermined torque and a predetermined rotation frequency such that an output torque is constant,
wherein the current command circuit is configured to generate a speed command to cause a speed to be increased to reduce a torque pulsation, and
wherein the current control circuit is configured to periodically change the current phase by a number of slot combinations of the rotor and the stator of the rotary electric machine during one rotation, the slot combinations based on a least common multiple of a number of the stator slots and rotor poles.

2. The control device of the rotary electric machine according to claim 1 ,
wherein the current control circuit is configured to periodically change the current phase by a number of slots of the stator of the rotary electric machine during one rotation, or by Number of slots of the stator of the rotary electric machine during one rotation/Number of slots at each pole and each phase.

3. The control device of the rotary electric machine according to claim 1 ,
wherein the current control circuit is configured to periodically change the current phase in a constant current value.

4. The control device of the rotary electric machine according to claim 1 ,
wherein, if a current phase to cause a maximum torque is βtmax, a range of periodically changing the current phase β is βtmax≤β.

5. The control device of the rotary electric machine according to claim 1 ,
wherein, if a current phase to cause a maximum torque is βtmax, a range of periodically changing a current phase β is β≤βtmax.

6. The control device of the rotary electric machine according to claim 1 ,
wherein the current control circuit is configured to change the current phase in a period where the torque pulsation is constant, the current phase is constant in a period where the torque pulsation is changed, and the current phase is periodically changed.

7. A control method of a rotary electric machine, comprising:
generating a flux sinusoidal wave signal according to a magnetic pole position of a rotor of the rotary electric machine;
generating a speed command, a torque command based on actual speed information, and a current command on the basis of the sinusoidal wave signal; and
controlling an inverter circuit interposed between a stator winding and a DC power source to make a sinusoidal current flow to the stator winding on the basis of the current command and a current detection signal of the stator winding of the rotary electric machine,
wherein a current phase of the sinusoidal current is periodically changed when the rotary electric machine is driven by a predetermined torque and a predetermined rotation frequency such that an output torque is constant,
wherein a speed command is generated to cause a speed to be increased to reduce a torque pulsation, and
wherein the current phase is periodically changed by a number of slot combinations of the rotor and the stator of the rotary electric machine during one rotation, the slot combinations based on a least common multiple of a number of the stator slots and the rotor poles.

Assignees

• Hitachi Automotive Systems Ltd
• Hitachi Astemo Ltd

Inventors

• Matsunobu Yutaka
• Hoshino Katsuhiro

Classifications

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• H02K11/21 Primary

  Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) · CPC title

• H02P6/15

  Controlling commutation time · CPC title

• H02K3/12

  arranged in slots · CPC title

• H02P6/17

  and for generating speed information · CPC title