US 11,456,635 B2Granted

Magnet embedded type motor and method for manufacturing the same

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsFumitaka Yoshinaga, Akira Yamashita

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Abstract

An magnet embedded type motor capable of reducing a counter electromotive voltage while suppressing reduction of a torque is provided. The magnet embedded type motor of the present disclosure includes a stator and a rotor rotatably disposed inside the stator. The rotor includes a rotor core and a plurality of magnet groups embedded in the rotor core along a circumferential direction, the rotor core includes a plurality of laminated metal foils. The rotor core has a pair of radially arranged magnet holes, a center side magnetic flux leakage prevention hole, and center side bridge portions for each magnetic pole. A pair of radially arranged magnets are embedded in the radially arranged magnet holes. In the rotor core, the center side bridge portion, a center portion, and an inter-magnetic pole portion are made of a nanocrystalline soft magnetic material, and another portion is made of an amorphous soft magnetic material.

Claims2

Dependent claims

A magnet embedded type motor comprising:

a stator;
and
a rotor rotatably disposed inside the stator,
wherein the stator includes a stator core and a coil wound around the stator core,
wherein the rotor includes a rotor core and a plurality of magnet groups, the rotor core includes a plurality of laminated metal foils, and the plurality of magnet groups are embedded in the rotor core along a circumferential direction and form a plurality of respective magnetic poles, and
wherein the rotor core has a pair of radially arranged magnet holes, a center side magnetic flux leakage prevention hole, and center side bridge portions for each magnetic pole, the pair of radially arranged magnet holes extend in a radial direction in an outer peripheral portion, the center side magnetic flux leakage prevention hole extends in a circumferential direction between center side ends of the pair of radially arranged magnet holes, and the center side bridge portions separate the pair of radially arranged magnet holes from the center side magnetic flux leakage prevention hole,
wherein a pair of radially arranged magnets are embedded in the pair of radially arranged magnet holes of the rotor core, and the pair of radially arranged magnets are included in the magnet group and extend in the radial direction,
wherein in the rotor core, the center side bridge portion, a center portion on the center side with respect to the outer peripheral portion, and an inter-magnetic pole portion between the magnetic poles mutually adjacent in the circumferential direction are made of a nanocrystalline soft magnetic material, and another portion is made of an amorphous soft magnetic material.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/017,939Filed 11 Sep 2020
Priority: JP JP2019-16900318 Sep 2019
Published: US 2021/0083535 A118 Mar 2021
Granted: 27 Sep 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02K 1/2766
Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]: having a flux concentration effect
H01F 1/153
Alloys characterised by their composition: amorphous metallic alloys, e.g. glassy metals
H02K 1/02
Details of the magnetic circuit: characterised by the magnetic material
H02K 1/16
Stationary parts of the magnetic circuit: stator cores with slots for windings