Speed control for motor - has reference oscillators frequency pulled by actual speed signal to avoid hunting convergence onto required speed

摘要

The speed control, for a motor, has a comparator comparing the actual speed frequency and the required speed frequency and generating a regulating signal. The actual speed frequency is obtained from a pulse generator driven by the motor shaft and the required frequency is produced by an oscillator. A part of the actual frequency voltage from the pulse generator is fed to the required-frequency oscillator to pull its frequency. The advantage of this frequency pulling lies in its avoiding the 'hunting' convergence on the required value, due to the variation of the reference value with the speed of the motor.