CONTROLLED POST-SYNCHRONIZING ON BRUSHLESS SYNCHRONOUS MOTORS

摘要

CONTROLLED POST-SYNCHRONIZING ON BRUSHLESS SYNCHRONOUS MOTORS A static control system for applying excitation to synchronous motors, especially of the brushless type, by firing a semiconductor switch to apply direct current excitation to the field of the motor. A post-synchronization firing circuit is provided for firing the switch in response to the voltage across the switch if the motor pulls into synchronism before the switch is fired. A control circuit is provided for inhibiting the operation of the post-synchro-nizing firing circuit during subsynchronous operation.