SYNCHRONIZING SYSTEM TO SYNCHRONIZE THE SPEED OF A DC MOTOR WITH THE FREQUENCY OF A COMMAND PULSE TRAIN

摘要

A controlled switch is connected in the power supply of a motor. The ON-OFF time of the controlled switch is determined by a circuit which includes a multi-vibrator which changes state in accordance with the relative rate of occurrence of pulses of the command pulse train and a pulse train proportional to motor speed; a divider circuit is connected to have the command pulse train applied thereto, and divides the frequency thereof by a value of n , in which n/= 2, the divided pulse train being applied to trigger the multi-vibrator to set, that is, to cause closing of the controlled switch, the pulses proportional to motor speed being applied to the multi-vibrator to re-set the multi-vibrator, the set-re-set time period of the multi-vibrator controlling the ON-OFF time of the controlled switch. Inhibit circuits can be provided to prevent spurious switching of the bistable multi-vibrator.