Miniature motor

摘要

A miniature motor with a two-pole stator, and a rotor having three or more salient poles each having a core with flanges extending toward both sides thereof and a winding. The rotor is adapted to simulate a two-pole construction by cutting off at least the tip of a flange on either side on a part or all the salient rotor pole cores, thereby limiting the spontaneous-stop angular positions of the rotor to two. One insulating spacer is provided between a plurality of commutator segments of the commutator in such a positional relationship as to come in contact with one of the two brushes when the rotor is at a spontaneous-stop angular position. The motor is prevented from burning and restarting suddenly after a stop since the motor has a self-inactivating function by interrupting current supply at spontaneous-stop angular positions while maintaining motor torque by minimizing the angle of non-conduction to the rotor.