# US 2021/0281132 A1 · Rotating electrical machine

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- Number: US 2021/0281132 A1
- Document ID: US20210281132A1
- Status: Published application
- Kind: A1
- Application number: 17/192,303
- Filed: 2021-03-04
- Published: 2021-09-09
- Earliest claimed: 2020-03-09
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Mitsutoshi AKITA; Daisuke ICHIGOZAKI; Tatsuhiko HIRANO; Kyoko NAKAMURA; Akira YAMASHITA
- Web page: https://patentgrep.com/patent/US20210281132A1

## 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 1/2773: {consisting of tangentially magnetized radial magnets}
- H02K 21/14: with magnets rotating within the armatures
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- Y02T 10/64: Electric machine technologies in electromobility
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A plurality of auxiliary magnets is embedded in a rotor core so as to surround the rotation axis of the rotating electrical machine in the cross-section orthogonal to the rotation axis. A plurality of main magnets is embedded in the rotor core so as to extend from the auxiliary magnet in the outer circumferential direction of the rotor. A plurality of magnetic poles of the rotor is formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets arranged at a distance from each other in the circumferential direction of the rotor, and the plurality of main magnets of each magnetic pole is arranged asymmetrically about a virtual line passing the rotation axis and axisymmetrically dividing the auxiliary magnet of each magnetic pole.

## Claims

### Claim 1

A rotating electrical machine comprising:
a rotor with permanent magnets embedded in a rotor core made of a soft magnetic material; and
a stator positioned on an outer circumference of the rotor,
wherein:
the permanent magnets include a main magnet arranged so as to be magnetized in a circumferential direction of the rotor, and an auxiliary magnet arranged so as to be magnetized in a radial direction of the rotor,
the auxiliary magnet includes a plurality of auxiliary magnets, the plurality of auxiliary magnets being embedded in the rotor core so as to surround a rotation axis of the rotor in a cross-section orthogonal to the rotation axis,
the main magnet includes a plurality of main magnets, the plurality of main magnets being embedded in the rotor core so as to extend from the auxiliary magnets in an outer circumferential direction of the rotor,
a plurality of magnetic poles of the rotor is formed around the rotation axis, the magnetic poles each having the auxiliary magnet and the plurality of main magnets arranged at a distance from each other in the circumferential direction of the rotor, the soft magnetic material being disposed between the main magnets, and
in the cross-section orthogonal to the rotation axis, the main magnets of each magnetic pole are arranged such that the plurality of main magnets are arranged asymmetrically about a virtual line passing the rotation axis and axisymmetrically dividing the auxiliary magnet of each magnetic pole.

### Claim 2 (depends on 1)

The rotating electrical machine according to claim 1, wherein in the cross-section, with the rotation axis as a center, the plurality of main magnets of each magnetic pole is arranged within an arrangement region having a central angle obtained by multiplying, by a coefficient of 0.10 to 0.55, a central angle of an entire fan-shaped region where the auxiliary magnet of each magnetic pole is disposed.

### Claim 3 (depends on 1)

The rotating electrical machine according to claim 1, wherein in each magnetic pole, one of the plurality of main magnets is disposed at an end of the auxiliary magnet.