公开(公告)号：US06707209B2

公开(公告)日：2004-03-16

申请号：US09851865

申请日：2001-05-09

Applicant: Alan D. Crapo ,  Todd A. Walls ,  Richard E. Hartsfield, Jr. ,  Charles P. Ketterer ,  Ken De Luca

Inventor： Alan D. Crapo ,  Todd A. Walls ,  Richard E. Hartsfield, Jr. ,  Charles P. Ketterer ,  Ken De Luca

IPC: H02K127

CPC classification number: H02K1/278 ,  H02K15/03 ,  H02K2201/06

Abstract: A permanent magnet electric machine with reduced cogging torque includes a plurality of axial rotor sections that are defined on a radially outer surface of a rotor. The axial rotor sections include a set of permanent magnets that are in an unmagnetized state and that have opposite edges that are aligned with an axis of the rotor. The axial rotor sections are rotationally offset such that the edges of the permanent magnets create stair step interfaces. The n sets of permanent magnets are magnetized using a magnetizing fixture. The permanent magnets have a generally rectangular shape and are preferably arc magnets or breadloaf magnets. The conductors of the magnetizing fixture are aligned with the stair step interfaces. A magnetic field induced in the permanent magnets is substantially reduced along the stair step interfaces.

Abstract translation: 具有减小的齿槽转矩的永磁电机包括限定在转子的径向外表面上的多个轴向转子部分。 轴向转子部分包括一组永磁体，它们处于非磁化状态并且具有与转子轴线对准的相对边缘。 轴向转子部分被旋转地偏移，使得永磁体的边缘形成楼梯级界面。 使用磁化固定装置对n组永磁体进行磁化。 永磁体具有大致矩形的形状，优选为弧形磁铁或面包磁体。 磁化夹具的导体与阶梯式接口对准。 永磁体中感应的磁场沿梯级级界面大幅减少。