Patent ID: 7385321
Filing Date: 2008-06-10
Classification: H02K

Abstract:
1. A motor having shifted teeth of pressed powder construction, comprising: an inner rotor; and a cylindrical stator arranged concentrically with the rotor and with an air gap therebetween; said stator having two spaced stator elements and a ring shaped permanent magnet held between the stator elements and magnetized so as to form N and S poles in the axial direction of the stator, a plurality of small stator teeth A and Ā separated in the axial direction of the stator from each other and formed on the inner peripheral surface of one of the spaced stator elements, a plurality of small stator teeth wherein a ratio of a thickness of the small stator teeth Ā in the axial direction of the stator to a thickness of the small stator teeth A in the axial direction of the stator is set to a value smaller than 1 so as to equalize substantially in mean permeance both small stator teeth A and Ā to each other, and wherein a ratio of a thickness of the small stator teeth