SINGLE-PHASE BRUSHLESS MOTOR

摘要

A single-phase brushless motor includes a stator and a rotor rotatable with respect to the stator. The rotor includes a number of permanent magnetic poles. The stator includes a stator core and a winding wound on the stator core. The stator core includes an outer annular portion, an inner annular portion, and connecting portions connecting the inner and outer annular portions. The winding is wound around the connecting portions. The rotor is received in the inner annular portion. The inner annular portion and the rotor form a substantially uniform air gap. A recess is formed in an inner surface of a part of the inner annular portion between each pair of adjacent connecting portions. A center of each recess deviates from a center line of symmetry of the corresponding pair of connecting portions.

主权项

1. A single-phase brushless motor comprising a stator and a rotor rotatable with respect to the stator, the rotor comprising a rotor core having a plurality of permanent magnetic poles, the stator comprising a stator core and a winding wound on the stator core, the stator core comprising an outer annular portion, an inner annular portion, and a plurality of connecting portions connecting the inner annular portion to the outer annular portion, the winding being wound around the connecting portions, the rotor being received in the inner annular portion;
wherein the inner annular portion of the stator and the rotor form a substantially uniform air gap therebetween, an inner surface, which faces the rotor, of a part of the inner annular portion between every two adjacent ones of the connecting portions is formed with a recess, and a center of each recess is offset from a middle line between corresponding two adjacent ones of the connecting portions.