公开(公告)号：US09680357B2

公开(公告)日：2017-06-13

申请号：US14031783

申请日：2013-09-19

Applicant: MAVEL S.r.l.

Inventor： Davide Bettoni ,  Andrea Bertoldo

IPC: H02K15/03 ,  H02K1/27

CPC classification number: H02K15/03 ,  H01F7/0221 ,  H01F41/0253 ,  H02K1/27 ,  H02K1/2733 ,  Y10T29/49012

Abstract: A method for manufacturing a rotor with permanent magnets may include providing a central core with a desired cross-section; providing a plurality of ferromagnetic discs having a hole shaped in a complementary manner to the cross-section of the central core; stacking up the ferromagnetic discs around the central core to form a cylindrical structure with a longitudinal cavity, wherein the longitudinal cavity is formed by the holes of the stacked-up ferromagnetic discs; integrally blocking together the stacked-up ferromagnetic discs; and removing the central core. A rotor may be manufactured by the method. The rotor may be used in an electric motor.