# US 2019/0173339 A1 · Rotary electric machine

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0173339 A1
- Document ID: US20190173339A1
- Status: Published application
- Kind: A1
- Application number: 16/321,103
- Filed: 2016-08-25
- Published: 2019-06-06
- Earliest claimed: 2016-08-25
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Yuji TAKIZAWA
- Web page: https://patentgrep.com/patent/US20190173339A1

## CPC

- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 1/2766: {having a flux concentration effect}
- H02K 29/03: with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
- H02K 2201/03: Machines characterised by aspects of the air-gap between rotor and stator
- H02K 2201/06: Magnetic cores, or permanent magnets characterised by their skew
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A rotary electric machine includes: an armature; and a rotator. The armature includes: a stator core including a plurality of magnetic teeth; and armature windings, which are formed of multi-layer multi-phase winding groups, are wound around the teeth, and are accommodated in slots between the teeth. The rotator is arranged through a magnetic air gap defined between the rotator and the armature, and is provided so as to be rotatable about a rotation shaft. The rotator includes a rotator core, and permanent magnets are embedded in the rotator core. The rotator core has a step-skew structure with two or more stages in an axial direction. Magnets having different polarities in different stages are arranged so as to be prevented from being overlapped with each other in a circumferential direction as viewed along the rotation shaft direction.

## Claims

### Claim 1

A rotary electric machine, comprising:
an armature; and
a rotator,
wherein the armature includes:
a stator core including a plurality of magnetic teeth; and
armature windings, which are formed of multi-layer multi-phase winding groups, are wound around the teeth, and are accommodated in slots between the teeth,
wherein the rotator is arranged through a magnetic air gap defined between the rotator and the armature, and is provided so as to be rotatable about a rotation shaft,
wherein the rotator includes a rotator core, and permanent magnets are embedded in the rotator core,
wherein the rotator core has a step-skew structure with two or more stages in an axial direction, and
wherein magnets having different polarities in different stages are arranged so as to be prevented from being overlapped with each other in a circumferential direction as viewed along the rotation shaft direction.

### Claim 2 (depends on 1)

The rotary electric machine according to claim 1,
wherein the rotator core is formed by stacking a plurality of sheet-like members in the rotation shaft direction,
wherein magnetic pole portions of the rotator core are connected to each other through a bridge, and
wherein a width of the bridge is equal to a thickness of the sheet-like members of the rotator core.

### Claim 3 (depends on 1)

The rotary electric machine according to claim 1, wherein the permanent magnets comprise anisotropic magnets.

### Claim 4 (depends on 2)

The rotary electric machine according to claim 2, wherein the permanent magnets comprise anisotropic magnets.