Elektronisch kommutierbarer Motor

摘要

The motor has stimulation windings supplied with PWM control signals via semiconducting end stages by an electronic control unit to produce a rotary field in the motor's stator and turn the permanent magnetic rotor. When starting the motor the control unit drives the end stages in overlapping control phases with PWM signals whose pulse width ratio rises from a minimum to a maximum value and then falls back to the minimum value. The overlapping regions produce stimulation winding (L1-L4) currents giving an approximately continuous torque variation. The commutation time is reduced during the start phase between successive control phases to increase the commutation frequency and hence the motor speed.