Patent ID: 7339292
Filing Date: 2008-03-04
Classification: H02K

Abstract:
1. A multi-polar rotary machine comprising: a stator; a cylindrical outer rotor arranged concentrically with the stator and with an air gap therebetween; said stator having two splitted 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 outer peripheral surface of one of the splitted stator elements, a plurality of small stator teeth wherein a ratio of thickness of the small stator teeth Ā or in the axial direction of the stator to a thickness of the small stator teeth A in the axial direction is set to 0.5 to 0.8 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