US 11,699,931 B2
Rotor structure of interior permanent magnet motor
Xuan Zou, Beijing (CN); Liangliang Zhang, Beijing (CN); Chunshuang Feng, Beijing (CN); Chunxia Cai, Beijing (CN); Lei Han, Beijing (CN); Yang Zhang, Beijing (CN); Dandan Qi, Beijing (CN); Xin Xu, Beijing (CN); Kaihe Zhang, Beijing (CN); and Biqing Sun, Beijing (CN)
Assigned to Jing-Jin Electric Technologies Co., Ltd., Beijing (CN)
Filed by Jing-Jin Electric Technologies Co., Ltd., Beijing (CN)
Filed on Jun. 30, 2021, as Appl. No. 17/364,030.
Claims priority of application No. 202010658204.X (CN), filed on Jul. 9, 2020.
Prior Publication US 2022/0014057 A1, Jan. 13, 2022
Int. Cl. H02K 1/27 (2022.01); H02K 1/276 (2022.01); H02K 1/24 (2006.01)
CPC H02K 1/2766 (2013.01) [H02K 1/246 (2013.01); H02K 2213/03 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A rotor structure of an interior permanent magnet motor comprising:
a rotating shaft and an iron core arranged on the rotating shaft;
a plurality of magnet grooves disposed inside the iron core along a circumferential direction, the plurality of magnet grooves being divided into a number of pairs, and each pair of magnet grooves being symmetrically arranged with respect to a direct axis (d-axis) of the motor;
a magnet disposed in at least one of the plurality of magnet grooves;
wherein an anti-demagnetization groove is provided respectively at upper and lower ends of a long side of each of the magnet grooves that is adjacent to a circumferential edge arc of the iron core, the anti-demagnetization groove is communicated with the magnet groove and used to reduce demagnetization at corners of the magnet, and
wherein an edge line of the anti-demagnetization groove comprises directly-connected straight line segments or directly-connected arc segments that are directly connected with a long side of the magnet groove that is adjacent to the circumferential edge arc of the iron core, and the directly-connected straight line segments or the directly-connected arc segments are not parallel to a long side of the magnet and tilt or extend toward the circumferential edge arc of the iron core.