Regulating RPM and/or position of one or more electric motors - applying signals for controlling motor pulse modulated by frequency synchronised with motor pulse frequency

摘要

The value of the pulse modulated frequency value lies in the same order of magnitude as the value of the motor pulse frequency. The control results using pulse width modulation (PWM). The PWM time (T) of a control pulse (A) for one motor phase is half as long as the time period in which the corresp. motor phase per working cycles is supplied with current in a specific direction (positive or negative). The system for regulating the electric motor (10) includes a control unit (11). The control unit produces at least one control signal (A1,A2,A3) for an individual motor phase. These signals are pulse modulated by a frequency synchronised with a motor pulse frequency. USE/ADVANTAGE - Video recorder. Interference pulses during motor control reduced in simple and cost effective manner to level tolerable in recorder.