SELF STARTING SYNCHRONOUS MOTOR HAVING MEANS FOR REDUCING NEGATIVE TORQUE TO PRODUCE STABLE NO-LOAD ROTATION

摘要

A synchronous motor having a permanent magnet rotor of the type that is self-starting by vibration. A more stable no-load rotation of the motor is achieved by providing means for reducing the negative portions of the instantaneous torque produced by the motor. The above object is obtained in one embodiment of the invention by choosing the dimensions of the stator so that the stator iron is saturated under no-load conditions of the motor.