公开(公告)号：EP4087093A1

公开(公告)日：2022-11-09

申请号：EP20909846.6

申请日：2020-09-30

申请人： Nidec Corporation

发明人： YAN, Guo-Jhih ,  WU, Keng chang ,  WANG, Kuo-Min

IPC分类号： H02K1/27

摘要： An embodiment of the present invention provides a rotor core and a motor including the rotor core. When a rotor yoke is provided with multiple magnetic pole core groups in a circumferential direction and each magnetic pole core group includes a magnetic conductor at its center and multiple permanent magnets around the magnetic conductor, structure becomes compact and reliable as a whole, and thus another mechanical structure for maintaining rigidity of the rotor is not required. The method for manufacturing the magnetic pole core groups facilitates mass production and manufacturing without causing a cumulative error in manufacturing and assembly. The center of each magnetic pole core group is formed of the magnetic conductor, so that the number of magnets to be used can be reduced at the maximum to achieve low cost. Then, the multiple permanent magnets provided around the magnetic conductor enables increasing magnetic flux concentration effect while preventing magnetic flux leakage. Thus, both high efficiency and high performance of the motor can be achieved.

公开(公告)号：EP3719977A1

公开(公告)日：2020-10-07

申请号：EP18883711.6

申请日：2018-11-02

申请人： Nidec Corporation

发明人： YAN, Guo-jhih ,  WU, Keng-Chang ,  WANG, Kuo-Min ,  LIN, Hsiu-Ying ,  LIN, Ming Zan ,  LIN, Chiaching

IPC分类号： H02K11/215 ,  H02K11/22 ,  H02K11/225 ,  H02K11/25

摘要： A motor includes a shaft arranged to be rotatable around a center axis, two rotors arranged in an axial direction to have a predetermined distance and at least one of rotors including a magnet, a stator arranged between the two rotors and including a plurality of stator cores arranged in a circumferential direction and coils wound on the plurality of stator cores, and a circuit board provided between the stator and the rotor including the magnet. The circuit board includes a plurality of groove holes penetrating the circuit board in an axial direction and arranged in a circumferential direction. The plurality of stator cores are fitted into the plurality of groove holes.