Control device for rotating electric machine

Patent metadata

Field	Value
Publication number	US-9813001-B2
Application number	US-201615160386-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	May 20, 2015
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A control device capable of suppressing electromagnetic force applied to a motor has a harmonic current calculation section and an operation section. The harmonic current calculation section calculates amplitude and phase of each of harmonic currents to be superimposed over a fundamental current which flows in phase windings of a stator of the motor based on conditions relating to load change of the motor. The operation section generates and transmits instruction signals to an inverter so that the calculated superimposed harmonic currents flow in the phase windings of the stator.

First claim

What is claimed is:

1. A control device for a rotating electric machine arranged in a rotating electric machine system, the rotating electric machine system comprising an electric power conversion unit and the rotating electric machine, the rotating electric machine comprising a stator on which phase windings are wound, the electric power conversion unit supplying a drive current to the phase windings of the stator to drive the rotating electric machine, the control device comprising:
a harmonic current calculation section capable of calculating harmonic currents to be superimposed over a fundamental current to be supplied to the phase windings of the stator so as to suppress electromagnetic force components affecting the rotating electric machine;
an operation section capable of operating the electric power conversion unit so that the drive current including the calculated harmonic currents which have been superimposed over the fundamental current flows in the phase windings of the stator,
wherein the harmonic current calculation section calculates the amplitude and phase of the harmonic currents to be superimposed over the fundamental current on the basis of conditions corresponding to a load of the rotating electric machine; and
a judgment section capable of judging conditions of instruction values generated by and transmitted from another control device, wherein
the conditions of the instruction values affect the load of the rotating electric machine,
the harmonic current calculation section calculates the amplitude and phase of the harmonic currents to be superimposed over the fundamental current on the basis of the correlation relationship between the amplitude and phase of the harmonic currents, and the conditions of the fundamental current judged by the judgment section, where the correlation relationship has been determined in advance,
the rotating electric machine forms a fan unit, and the control device uses an air flow mode as the conditions of the instruction values,
the control device uses a set temperature as the conditions of the instruction values,
the judgment section judges an instruction value of a rotation angular velocity of the rotating electric machine generated by and transmitted from the another control device,
the judgment section judges an air flow passage through which the blowing air is supplied from the fan unit on the basis of the air flow mode and the set temperature as the instruction values, and
the control device uses, as the correlation relationships between the conditions of the instruction values and the amplitude and phase of the harmonic currents, a relationship between the air flow passage, the rotation angular velocity of the rotating electric machine and the amplitude of the harmonic currents, and a relationship between the air flow passage, the rotation angular velocity of the rotating electric machine, and the phase of the harmonic currents.

2. The control device according to claim 1 , further comprising:
an acquiring section capable of detecting the fundamental current flowing in the phase windings of the stator,
wherein the conditions corresponding to the load of the rotating electric machine are conditions of the fundamental current flowing in the phase windings of the stator, and
the harmonic current calculation section calculates the amplitude and phase of the harmonic currents to be superimposed over the fundamental current which flows in the phase windings of the stator on the basis of the correlation relationship between the conditions of the fundamental current and the amplitude and phase of the harmonic currents, and the conditions of the fundamental current detected by the acquiring section, where the correlation relationship has been determined in advance.

3. The control device according to claim 1 , further comprising:
an acquiring section capable of detecting the fundamental current flowing in the phase windings of the stator; and
a judgment section capable of judging the conditions of instruction values generated by and transmitted from another control device,
wherein the conditions of the fundamental current flowing in the phase windings of the stator and the conditions of the instruction values affect the load of the rotating electric machine,
a first correlation relationship between the conditions of the fundamental current and the amplitude and phase of the harmonic currents, a second correlation relationship between the conditions of the instruction values and the amplitude and phase of the harmonic currents have been determined in advance, and
the harmonic current calculation section calculates the amplitude and phase of the harmonic currents to be superimposed over the fundamental current on the basis of the first correlation relationship and the conditions of the fundamental current acquired by the acquiring section, or the second correlation relationship and the conditions of the instruction values judged by the judgment section.

4. The control device according to claim 1 , wherein the control device uses the amplitude of the fundamental current as the conditions of the fundamental current.

5. The control device according to claim 4 , wherein the harmonic current calculation section increases the amplitude of the harmonic currents to be superimposed over the fundamental current according to increase of the amplitude of the fundamental current detected by the acquiring section.

6. A control device for a rotating electric machine arranged in a rotating electric machine system, the rotating electric machine system comprising an electric power conversion unit and the rotating electric machine, the rotating electric machine comprising a stator on which phase windings are wound, the electric power conversion unit supplying a drive current to the phase windings of the stator to drive the rotating electric machine, the control device comprising:
a harmonic current calculation section capable of calculating harmonic currents to be superimposed over a fundamental current to be supplied to the phase windings of the stator so as to suppress electromagnetic force components affecting the rotating electric machine;
an operation section capable of operating the electric power conversion unit so that the drive current including the calculated harmonic currents which have been superimposed over the fundamental current flows in the phase windings of the stator,
wherein the harmonic current calculation section calculates the amplitude and phase of the harmonic currents to be superimposed over the fundamental current on the basis of conditions corresponding to a load of the rotating electric machine; and
an acquiring section capable of detecting the fundamental current flowing in the phase windings of the stator,
wherein the conditions corresponding to the load of the rotating electric machine are conditions of the fundamental current flowing in the phase windings of the stator,
wherein the harmonic current calculation section calculates the amplitude and phase of the harmonic currents to be superimposed over the fundamental current which flows in the phase windings of the stator on the basis of the correlation relationship between the conditions of the fundamental current and the amplitude and phase of the harmonic currents, and the conditions of the fundamental current detected by the acquiring section, where the correlation relationship has been determined in advance,
wherein a K-th angular velocity is K times (K is an integer not less than two) of a variable angular velocity of the fundamental current flowing in the phase windings of the stator, a K-th harmonic current has a K-th angular velocity as a variable angular velocity, a K-th electromagnetic force component has a K-th angular velocity and affects the rotating electric

Assignees

• Denso Corp
• Asmo Co Ltd

Inventors

• Akimatsu Ryunosuke
• Tonari Tatsuya
• Uchida Toshihiro

Classifications

• H02P6/10 Primary

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• H02P29/50

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