公开(公告)号：US20210119521A1

公开(公告)日：2021-04-22

申请号：US17134712

申请日：2020-12-28

Applicant: ABB Schweiz AG

Inventor： Mikael Heikel ,  Mark Szucs-Bartfai ,  Aaron Szucs ,  Blanka Szucs-Bartfai ,  Zsolt Kovacs ,  Jan Westerlund

IPC: H02K17/20 ,  H02K17/42

Abstract: The disclosure relates to an electric induction machine in which a chamfer region is provided between each respective rotor groove and rotor bar at a position corresponding to a radially outer internal corner region of the rotor groove. Suitably, the chamfer region has a relative magnetic permeability less than that of the rotor frame, and an electrical resistivity higher than that of the rotor bar. Moreover, a minimum diameter of the chamfer region is suitably larger than a manufacturing-tolerances derived maximum clearance between the respective rotor groove and robot bar, if any.