SPEED CONTROL SYSTEM OF MOTOR

摘要

PURPOSE:To perform with stability motor speed control by setting an active filter with a coefficient automatically variable according to a direct current signal level obtained in relation with the revolution speed of a motor. CONSTITUTION:The revolution speed signal of a motor 1 obtained at a speed voltage converter 2 is compared with a standard signal, and an active low-pass filter 5' is set in a loop of a speed control system where a comparison output signal is fed into the motor 1 through an amplifier 6. The active low-pass filter 5' controls the gain K of an inphase variable amplifier 7 according to a direct current level in a signal obtained from the speed voltage converter 2.