公开(公告)号：US20220158513A1

公开(公告)日：2022-05-19

申请号：US17598874

申请日：2020-01-20

Applicant: NIDEC CORPORATION

Inventor： Tomoya UEDA ,  Yukie YAMADA

IPC: H02K3/12 ,  H02K15/085 ,  H02K1/16

Abstract: Provided is a stator including: a stator core having a plurality of teeth; and a distributed winding coil. The plurality of teeth include a first tooth having an umbrella and a second tooth having no umbrella. The first and second teeth are alternately disposed in a circumferential direction of the stator core. A slot between the first and second teeth adjacent to each other has a radial opening that opens radially. The radial opening has a circumferential width larger than a wire diameter of the coil and smaller than twice the wire diameter of the coil.

公开(公告)号：US20230100335A1

公开(公告)日：2023-03-30

申请号：US17800079

申请日：2020-09-14

Applicant: Nidec Corporation

Inventor： Yukie YAMADA

IPC: H02K1/276 ,  H02K1/28

Abstract: A rotor includes a rotor core including a first slit, a second slit radially inward of the first slit, and a third slit radially inward of the second slit, a first magnet in the first slit, a second magnet in the second slit, and a third magnet in the third slit. A first angle defined by a line segment connecting a reference point and the end portion of the first slit and a line segment connecting the reference point and the end portion of the first magnet is larger than a second angle defined by a line segment connecting the reference point and the end portion of the second slit and a line segment connecting the reference point and the end portion of the second magnet.

公开(公告)号：US20240014700A1

公开(公告)日：2024-01-11

申请号：US18254603

申请日：2021-09-28

Applicant: NIDEC CORPORATION

Inventor： Yukie YAMADA ,  Tomoya UEDA

IPC: H02K1/2753

CPC classification number: H02K1/2753

Abstract: A rotor includes a rotor core having a hole, and a magnet inside the hole. A stator includes a stator core having an annular core back surrounding the rotor core and teeth extending inward from the core back and arranged at intervals in a circumferential direction, and coils attached to the stator core. The hole has an arc shape protruding inward. The magnet is in the hole and has an arc shape extending along the hole. The rotor core has cavity portions sandwiching the magnet. A curved outer surface of the hole is in close contact with a curved outer surface of the magnet at a portion closer to a center in the circumferential direction than an end portion in the circumferential direction. At least a part of the cavity portion extends to the outer side in the circumferential direction with respect to the center of a pole.