Brushless motor.

摘要

An inexpensive brushless motor (36) including a single position detecting element can start itself and can rotate smoothly with a good efficiency with reduced noises caused thereby. The motor comprises a stator core (38) having T-shaped radial stator poles (54) with driving coils (56) wound on all or some of the stator poles. A field magnet (48) having driving alternate N and S magnetic pole zones is mounted for rotation in an opposing relationship to circumferential faces of the stator poles (54) of the stator core (38). A cogging generating magnetic plate (40) is located in an opposing relationship below the field magnet (48) and has a cutaway portion (61) formed therein which has a suitable angular width such that the magnetic plate may (40) generate a cogging to move the field magnet (48) by attraction therebetween to a position other than any dead point and from which the field magnet can start itself. The single position detecting element is located such that it may detect no dead point upon starting of the motor.