Patent ID: 8823235
Filing Date: 2014-09-02
Classification: H01F,H02K

Abstract:
1. An axial gap-type permanent magnetic rotating machine comprising a rotor comprising a rotating shaft having an axis of rotation, a rotor yoke of disc shape radially extending from the shaft, and a plurality of permanent magnet segments arranged on a surface of the rotor yoke and circumferentially about the axis of rotation such that each permanent magnet segment have a magnetization direction parallel to the axis of rotation, and a stator having a plurality of coils arranged circumferentially about the axis of rotation, the rotor and the stator being disposed to define an axial gap therebetween, wherein each of said permanent magnet segments is an assembly of two or more divided permanent magnet pieces divided along parallel to a direction of the axis of rotation, each of the divided permanent magnet pieces has a magnetization direction parallel to the axis of rotation, and a coercive force at a surface region and a central region of the divided permanent magnet piece, and in each of the divided permanent magnet pieces, the coercive force in the surface region of the magnet piece is higher than that in the central region of the magnet piece.