公开(公告)号：US20170324287A1

公开(公告)日：2017-11-09

申请号：US15512585

申请日：2015-09-08

Applicant: VOLKSWAGEN AKTIENGESELLSCHAFT

Inventor： HAUKE EINFELD ,  RAINER HELMER

IPC: H02K1/27 ,  H02K1/32

CPC classification number: H02K1/276 ,  H02K1/2766 ,  H02K1/2773 ,  H02K1/32 ,  H02K2201/03 ,  H02K2213/03

Abstract: Circulating currents are suppressed and thermal losses are reduced in a three-phase permanent-magnet-excited synchronous machine in a delta circuit. The machine has a stator in which, during operation, a voltage is induced by way of a magnetic field generated by magnetic poles of a rotor. A field strength of the magnetic field has, along a circumferential coordinate of the rotor, a profile formed from superimposition of a sinusoidal basic function and of sinusoidal harmonics of the basic function. Groove recesses and/or cavities are located in and/or under a circumferential face of the rotor that face the stator and follow an axial extent of the pole pitch of the rotor in their longitudinal extent and extend transversely with respect to the longitudinal extent along the circumferential coordinate in the region of the maximum values of at least the third harmonic and outside the maximum values of the basic function.