Patent ID: 6181047
Filing Date: 2001-01-30
Classification: D06F,H02K

Abstract:
A permanent magnet motor comprising:a rotor having a permanent magnet; anda stator core having circumferential teeth the number of which is 2n where n is an integer equal to or larger than 2, the teeth including first teeth the number of which is n and second teeth the number of which is n, the first and second teeth being circumferentially regularly disposed alternately;wherein each first tooth has a head with an end face opposed to the rotor and formed generally into the shape of an arc about a center of rotation of the rotor so that an air gap defined between said end face and a surface of the rotor opposed to said end face is circumferentially uniform; andwherein each second tooth has a head with an end face opposed to the rotor and shaped so as to be gradually departed farther away from an opposite surface of the rotor as the head extends from a circumferentially central portion thereof toward both circumferential ends thereof.