公开(公告)号：US20140283372A1

公开(公告)日：2014-09-25

申请号：US14296116

申请日：2014-06-04

申请人： KABUSHIKI KAISHA TOSHIBA

发明人： Yutaka HASHIBA ,  Kazuto SAKAI ,  Norio TAKAHASHI ,  Kazuaki YUUKI ,  Masanori ARATA ,  Yusuke MATSUOKA ,  Motoyasu MOCHIZUKI ,  Tadashi TOKUMASU

IPC分类号： H02K15/03

CPC分类号： H02K15/03 ,  H02K1/02 ,  H02K1/223 ,  H02K1/2766 ,  H02K21/028 ,  Y10T29/49009 ,  Y10T29/49012

摘要： According to one embodiment, a rotor is configured by a rotor core and magnetic poles. Two or more types of permanent magnets are used such that each product of coercivity and thickness in the magnetization direction becomes different. A stator is located outside the rotor with air gap therebetween and configured by an armature core winding. At least one permanent magnet is magnetized by a magnetic field by a current of the armature winding to change a magnetic flux content thereof irreversibly. A short circuited coil is provided to surround a magnetic path portion of the other permanent magnet excluding the magnet changed irreversibly and a portion adjacent to the other permanent magnet where the magnetic flux leaks. A short-circuit current is generated in the short circuited coil by the magnetic flux generated by conducting a magnetization current to the winding. A magnetic field is generated by the short-circuit current.