US 12,294,241 B2
Stator core, magnetic levitation bearing, and motor
Weilin Guo, Zhuhai (CN); Gao Gong, Zhuhai (CN); Fang Zhang, Zhuhai (CN); Xin Li, Zhuhai (CN); Zhehao Deng, Zhuhai (CN); and Jianhui Wang, Zhuhai (CN)
Assigned to GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI, Zhuhai (CN)
Filed by GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI, Zhuhai (CN)
Filed on Jan. 23, 2023, as Appl. No. 18/158,150.
Application 18/158,150 is a continuation of application No. PCT/CN2021/093064, filed on May 11, 2021.
Claims priority of application No. 202010842317.5 (CN), filed on Aug. 20, 2020.
Prior Publication US 2023/0155429 A1, May 18, 2023
Prior Publication US 2023/0352991 A9, Nov. 2, 2023
Int. Cl. H02K 1/14 (2006.01)
CPC H02K 1/146 (2013.01) [H02K 2213/03 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A stator core, used in a magnetic levitation bearing, comprising an annual yoke, wherein:
the annular yoke has an inner circumferential wall and an outer circumferential wall;
a plurality of pole pillars are disposed on the inner circumferential wall, and each of the plurality of pole pillars extends towards an axis of the inner circumferential wall;
there is a distance D between an axis of the outer circumferential wall and the axis of the inner circumferential wall, and D≠0 is satisfied;
in a projection of the annular yoke projected on any radial plane of the annular yoke, the inner circumferential wall has a circle center (O), the outer circumferential wall has a circle center(S), the distance D is a distance between the circle center (O) and the circle center(S), and the stator core is symmetrical with respect to a straight line (OS) connecting the circle center (O) and the circle center(S);
a straight line passing through the circle center (O) and perpendicular to the straight line (OS) is a first straight line, the first straight line divides the annual yoke into a first yoke part and a second yoke part, and an area A1 of the first yoke part is greater than an area A2 of the second yoke part; and
a circumferential width W1 of each of pole pillars on the first yoke part is greater than a circumferential width W2 of each of pole pillars on the second yoke part.