公开(公告)号：US20250158464A1

公开(公告)日：2025-05-15

申请号：US18509906

申请日：2023-11-15

Applicant: GM Global Technology Operations LLC

Inventor： Eric C Clough ,  Alireza Fatemi ,  Thomas W Nehl ,  David A. Smith

IPC: H02K1/28 ,  H02K1/276 ,  H02K21/14

Abstract: A radial flux electric motor includes a stator having a radially inner stator surface and stator windings arranged thereon. The motor also includes a rotor mounted inside the stator and configured to rotate relative thereto about an axis. The rotor has a rotor core defined by a rotor outer surface and includes magnetic poles configured to generate magnetic flux and defining flux leakage zones. The motor additionally includes a selective permeability sleeve arranged circumferentially on the rotor and fixed to the rotor outer surface, thereby establishing an airgap between the sleeve and the stator. The sleeve provides reinforcement to the rotor core and to the magnetic poles and includes regions of relatively high and relatively low magnetic permeability alternating around the rotor outer surface. The regions of relatively low magnetic permeability are arranged radially outward and across from the flux leakage zones to control magnetic flux distribution in the motor.