Patent ID: 8796897
Filing Date: 2014-08-05
Classification: H02K

Abstract:
1. A motor comprising: an annular rotor member made of a soft magnetic material and rotatably provided in the motor, the rotor member comprising: a plurality of second magnetic poles radially extending from the rotor member and respectively arranged between the plurality of first magnetic poles, the plurality of second magnetic poles being consequently magnetized as a plurality of consequent poles by the plurality of first magnetic poles, the plurality of second magnetic poles having a same second magnetic polarity that is opposite to the first magnetic polarity; and an armature provided to be opposite to the rotor member for generating a rotating magnetic field, the armature comprising: a number of teeth in the plural sets of teeth within the one pole-pair pitch being set to 2k (k is a natural number), a number of teeth facing each of the first magnetic poles in the plurality of teeth being set to be equal to or greater than the sum of k and 1.