Patent ID: 7830058
Filing Date: 2010-11-09
Classification: H02K,Y10T

Abstract:
1. A surface magnet type motor having a magnet at a surface of a rotor, comprising: an anti-scattering tube formed in a cylindrical configuration longer in length than said magnet mounted at said rotor in an axial direction, and having said magnet press-fitted therein for preventing scattering of the magnet, and a stress alleviation portion alleviating stress generated at an end of said magnet press-fitted into said anti-scattering tube, wherein said stress alleviation portion is provided at a projection portion that is a portion of said anti-scattering tube and protruding from each of both end faces of said press-fitted magnet, a displacement difference in a direction of an inner diameter generated between said projection portion and a portion excluding said projection portion by said press-fitting is suppressed by forming said projection portion in lower rigidity than said portion excluding the projection portion.