公开(公告)号：US06552453B2

公开(公告)日：2003-04-22

申请号：US09861706

申请日：2001-05-22

申请人： Shoji Ohiwa ,  Kazuo Ohnishi ,  Atushi Yamamoto ,  Shinji Shimizu ,  Youji Unoki ,  Yukinori Kurita

发明人： Shoji Ohiwa ,  Kazuo Ohnishi ,  Atushi Yamamoto ,  Shinji Shimizu ,  Youji Unoki ,  Yukinori Kurita

IPC分类号： H02K700

CPC分类号： H02K29/08 ,  H02K37/18

摘要： The magnetic pole position detector for an electric motor comprises a detection rotor, a detection stator, and magnetic flux concentration tips and magneto electro transducers. The detection rotor is fixed to an axis of rotation of the motor and comprised of disc-like rotors having first toothlike protrusions and a permanent magnet. The disc-like rotors are assembled so as to make the first toothlike protrusions coincide in the axial direction and the permanent magnet is fixed between the disc-like rotors. The detection stator is comprised of stator cores comprised of an annular yoke and stator teeth formed at regular intervals on the former. Second toothlike protrusions are formed on the inner end of the stator teeth. The stator cores are assembled with a gap in the axial direction so as to make respective second toothlike protrusions coincide in the axial direction. The magnetic flux concentration tips and the magneto electro transducers are placed in the gaps in the axial direction. The detection rotor and the detection stator are assembled with a gap in the radial direction. The magnetic pole position is obtained by detecting the magnetic flux flowing through the stator teeth that varies in accordance the rotation of the detection rotor.