Rotating electrical machine

Patent metadata

Field	Value
Publication number	US-11611250-B2
Application number	US-202117192303-A
Country	US
Kind code	B2
Filing date	Mar 4, 2021
Priority date	Mar 9, 2020
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

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.

First claim

What is claimed is:

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 plurality of main magnets arranged so as to be magnetized in a circumferential direction of the rotor, and a plurality of auxiliary magnets arranged so as to be magnetized in a radial direction of the rotor,
the plurality of auxiliary magnets are 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 plurality of main magnets are 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 one of the plurality of auxiliary magnets and a plurality of 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,
in the cross-section orthogonal to the rotation axis, the plurality of main magnets of each magnetic pole are arranged asymmetrically about a virtual line passing the rotation axis and axisymmetrically dividing the auxiliary magnet of each magnetic pole, and
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.

2. 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 one of the plurality of auxiliary magnets.

Assignees

• Toyota Motor Co Ltd

Inventors

• Akita Mitsutoshi
• Ichigozaki Daisuke
• Hirano Tatsuhiko
• Nakamura Kyoko
• Yamashita Akira

Classifications

• H02K1/276 Primary

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title

• H02K1/02

  characterised by the magnetic material · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K2201/06

  Magnetic cores, or permanent magnets characterised by their skew · CPC title

• H02K1/2773 Primary

  consisting of tangentially magnetized radial magnets · CPC title