# US 2018/0323686 A1 · Permanent magnet motor

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- Number: US 2018/0323686 A1
- Document ID: US20180323686A1
- Status: Published application
- Kind: A1
- Application number: 15/772,851
- Filed: 2015-12-25
- Published: 2018-11-08
- Earliest claimed: 2015-12-25
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Yuji TAKIZAWA; Kentaro URIMOTO; Satoru AKUTSU
- Web page: https://patentgrep.com/patent/US20180323686A1

## CPC

- H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
- H02K 1/16: Stator cores with slots for windings
- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 3/12: arranged in slots
- H02K 11/0141: {Shields associated with casings, enclosures or brackets}
- H02K 3/28: Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32)
- H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence)
- H02K 29/03: with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

Provided is a permanent magnet motor including an armature, a rotor, and an angle detector. The angle detector includes a sensor magnet and a semiconductor sensor. The sensor magnet is magnetized into two poles and is provided in an end portion of a rotation shaft, and has the same rotation center as that of the rotation shaft. The semiconductor sensor is opposed to the sensor magnet in an extension direction of the rotation shaft. The semiconductor sensor and the sensor magnet have a gap formed therebetween, and a plate member made of a magnetic substance is provided between the semiconductor sensor and an end portion of the armature iron core on the semiconductor sensor side.

## Claims

### Claim 1

A permanent magnet motor, comprising:
an armature;
a rotor; and
an angle detector,
wherein the armature includes:
an armature iron core; and
an armature winding,
wherein the rotor includes:
a rotor iron core; and
a permanent magnet
wherein the angle detector includes:
a sensor magnet; and
a semiconductor sensor,
wherein the rotor iron core including the permanent magnet is fixed to a rotation shaft,
wherein the sensor magnet is magnetized into two poles and is provided in an end portion of the rotation shaft, and has the same rotation center as a rotation center of the rotation shaft,
wherein the semiconductor sensor is opposed to the sensor magnet in an extension direction of the rotation shaft;
wherein the semiconductor sensor and the sensor magnet have a gap formed therebetween, and
wherein a plate member made of a magnetic substance is provided between the semiconductor sensor and an end portion of the armature iron core on the semiconductor sensor side.

### Claim 2 (depends on 1)

A permanent magnet motor according to claim 1, wherein the permanent magnet motor includes any one of a 10-pole and 12-slot type magnet motor, a 14-pole and 12-slot type magnet motor, and a 14-pole and 18-slot type magnet motor.

### Claim 3 (depends on 1)

A permanent magnet motor according to claim 1, wherein the armature winding has six phases of U1, U2, V1, V2, W1, and W2 in which phases of supply currents are the same between two phases of each of sets of U1 and U2, V1 and V2, and W1 and W2.

### Claim 4 (depends on 1)

A permanent magnet motor according to claim 1, wherein:
the permanent magnet motor includes any one of a 10-pole and 12-slot type magnet motor and a 14-pole and 12-slot type magnet motor;
the armature winding has six phases of U1, U2, V1, V2, W1, and W2 in which two phases of supply currents of each of sets of U1 and U2, V1 and V2, and W1 and W2 have a phase difference of 30 degrees in an electrical angle; and
the permanent magnet motor is driven through current supply only to three phases of U2, V2, and W2 different in a phase of the supply current by 120 degrees from one another, without current supply to the other three phases.

### Claim 5 (depends on 1)

A permanent magnet motor according to claim 1, wherein the armature winding has six phases of U1, U2, V1, V2, W1, and W2 in which the windings of the two phases of each of sets of U1 and U2, V1 and V2, and W1 and W2 have the same number of turns, and are stored in the same slot.

### Claim 6 (depends on 2)

A permanent magnet motor according to claim 2, wherein the armature winding has six phases of U1, U2, V1, V2, W1, and W2 in which the windings of the two phases of each of sets of U1 and U2, V1 and V2, and W1 and W2 have the same number of turns, and are stored in the same slot.

### Claim 7 (depends on 3)

A permanent magnet motor according to claim 3, wherein the armature winding has six phases of U1, U2, V1, V2, W1, and W2 in which the windings of the two phases of each of sets of U1 and U2, V1 and V2, and W1 and W2 have the same number of turns, and are stored in the same slot.

### Claim 8 (depends on 4)

A permanent magnet motor according to claim 4, wherein the armature winding has six phases of U1, U2, V1, V2, W1, and W2 in which the windings of the two phases of each of sets of U1 and U2, V1 and V2, and W1 and W2 have the same number of turns, and are stored in the same slot.