| 摘要 |
PROBLEM TO BE SOLVED: To provide a single phase brushless motor which can reduce the cogging torque.SOLUTION: A single phase brushless motor includes a stator and a rotor. The stator includes a stator core 51 and stator windings 53 wound on the stator core. The stator core includes a yoke portion 55, and first and second pole portions extending inwardly from the yoke portion. An end surface of the first pole portion 56 includes a first arc surface 56a having a first groove 56d. An end surface of the second pole portion 57 includes a second arc surface 57a having a second groove 57d. The first and second arc surfaces are opposed to each other and define a receiving space therebetween. The rotor includes a rotary shaft and permanent magnetic poles 63 fixed to the rotary shaft. The permanent magnetic poles are received in the receiving space. A substantially uniform gap is formed between the first and second arc surfaces and the permanent magnetic poles.SELECTED DRAWING: Figure 6 |
