# US 10,122,305 B2 · Motor control apparatus

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- Number: US 10,122,305 B2
- Document ID: US10122305B2
- Status: Granted
- Kind: B2
- Application number: 15/552,631
- Filed: 2016-02-18
- Published: 2018-02-22
- Granted: 2018-11-06
- Earliest claimed: 2015-02-25
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Koji Sakaguchi
- Web page: https://patentgrep.com/patent/US10122305B2

## CPC

- H02P 6/16: Circuit arrangements for detecting position
- H02P 1/163: {for starting an individual reluctance motor}
- H02P 25/08: Reluctance motors
- H02P 25/0925: {wherein the converter comprises only one switch per phase}
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A motor control apparatus which is applied to an actuator provided with a motor and an encoder, and drives the motor is provided. The motor control apparatus comprises: a controller that learns an initial position of a rotor, and also decides an energized phase; and a drive circuit that performs switching operation to energize an energized phase. The controller learns that, in learning the initial position, the initial position of the rotor is a two-phase facing position in which two adjacent salient poles of the rotor face salient poles of two energized phases of a stator, and the initial position of the rotor is a one-phase facing position in which one salient pole of the rotor faces a salient pole of one non-energized phase of the stator.

## Claims

### Claim 1

A motor control apparatus which is applied to an actuator provided with
a motor that includes a stator having a plurality of salient poles, wound with three-phase windings, on an inner periphery, and a rotor having a plurality of salient poles on an outer periphery, and
an encoder that outputs, at a predetermined angle interval, an A-phase signal and a B-phase signal that take either Hi or Lo accompanied by rotation of the rotor,
the motor control apparatus driving the motor, the motor control apparatus comprising:
a controller that learns an initial position of the rotor based on the A-phase signal and the B-phase signal acquired from the encoder in a state where two-phases out of three phases have been energized during initial drive after power-on, and also decides an energized phase based on a rotational position of the rotor during normal drive after the initial drive; and
a drive circuit that performs switching operation to energize the energized phase, which is decided by the controller,
wherein:
the controller learns that, in learning the initial position,
the initial position of the rotor is a two-phase facing position in which two adjacent salient poles of the rotor face salient poles of two energized phases of the stator when values of the A-phase signal and the B-phase signal are in a first state of both being Hi or both being Lo,
the initial position of the rotor is a one-phase facing position in which one salient pole of the rotor faces a salient pole of one non-energized phase of the stator when the values of the A-phase signal and the B-phase signal are in a second state of both being Hi or both being Lo;
the encoder is configured to include a rotary magnet having an annular shape and a magnetic sensor of a hall IC; and
a magnetizing pitch of the rotary magnet is set to 7.5° between N-pole and S-pole.

### Claim 2 (depends on 1)

The motor control apparatus according to claim 1, wherein:
in the motor, a ratio of a number of salient poles of the stator and a number of salient poles of the rotor is set to 3:2.

### Claim 3 (depends on 1)

The motor control apparatus according to claim 1, wherein:
the motor is provided by a switched reluctance motor.

### Claim 4 (depends on 1)

The motor control apparatus according to claim 1, wherein:
the actuator is provided by a range switching apparatus of an automatic transmission; and
the motor is used as a drive source that switches a range of the range switching apparatus.

### Claim 5 (depends on 1)

The motor control apparatus according to claim 1, wherein:
after the power-on, the two-phases out of the three phases are energized during the initial drive and the energized two-phases are unchanged during the initial drive.