US 12,323,032 B2
Motor
Yu Tachibana, Kyoto (JP); Tomohiro Hasegawa, Kyoto (JP); Yoichi Sekii, Kyoto (JP); Masahiro Otani, Kyoto (JP); and Hiroaki Hirano, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Filed by Nidec Corporation, Kyoto (JP)
Filed on Feb. 24, 2022, as Appl. No. 17/679,416.
Claims priority of application No. 2021-030894 (JP), filed on Feb. 26, 2021.
Prior Publication US 2022/0278589 A1, Sep. 1, 2022
Int. Cl. H02K 7/00 (2006.01); H02K 3/50 (2006.01); H02K 5/24 (2006.01); H02K 7/08 (2006.01)
CPC H02K 7/003 (2013.01) [H02K 3/50 (2013.01); H02K 5/24 (2013.01); H02K 7/083 (2013.01); H02K 2203/06 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A motor comprising:
a shaft centered on a central axis extending vertically;
an upper bearing that supports an upper portion of the shaft;
a lower bearing that supports a lower portion of the shaft;
an upper bush that holds the upper bearing; and
a stator including a coil opposing an outer peripheral surface of the shaft in a radial direction;
wherein the shaft includes a magnetization pattern in which at least two or more poles of N and S poles are alternately arranged in a circumferential direction; and
a portion of the upper bearing protrudes axially upward beyond an axially uppermost portion of the upper bush;
wherein an axial magnetic center of the shaft is located axially above an axial magnetic center of the stator.