公开(公告)号：US20190165622A1

公开(公告)日：2019-05-30

申请号：US16195866

申请日：2018-11-20

Applicant: UBTECH Robotics Corp

Inventor： Youjun Xiong ,  Yan Zhou ,  Youpeng Li ,  Wenhua Fan

IPC: H02K1/22

Abstract: An inner rotor lamination for a permanent magnet direct current motor includes a yoke and a plurality of teeth connected to the yoke. Each of the teeth has a tooth body connected to the yoke and a tooth tip connected to a distal end of the tooth body. A winding slot is formed between each two adjacent tooth bodies. One tooth tip defines one or more first through holes adjacent to a radial end thereof, and one or more second through holes. Each of the one or more second through holes is located adjacent to one circumferential end of the at least one tooth tip.