公开(公告)号：US09859762B2

公开(公告)日：2018-01-02

申请号：US14525291

申请日：2014-10-28

Applicant: ABB TECHNOLOGY AG

Inventor： Ari Vartiainen ,  Pekka Kanninen ,  Petri Mäki-Ontto

IPC: H02K9/00 ,  H02K9/06 ,  H02K1/30 ,  H02K1/27 ,  H02K1/28 ,  H02K1/32 ,  H02K9/02

CPC classification number: H02K1/30 ,  H02K1/2773 ,  H02K1/28 ,  H02K1/32 ,  H02K1/325 ,  H02K9/02

Abstract: An electric machine can include a stator, a rotor frame and a pole arrangement with: plural segment pieces disposed circumferentially around, and fastened to, the rotor frame; permanent magnet pieces positioned on inclined side edges of each segment piece; and plural pole pieces disposed circumferentially around the rotor frame and disposed alternatingly with the segment pieces. The magnet pieces are pressed between inclined side edges of the pole pieces and the inclined side edges of the segment pieces. The segment pieces, the permanent magnet pieces and the pole pieces form a closed ring around the outer surface of the rotor frame, with plural such rings being arranged after each other in an axial direction. An axial air channel can pass through the rings, and at least one radial air duct (R1, R2) between the rings.