Operating electronically commutated DC motor involves increasing current limit for defined period if exceeded while motor rotating to make higher motor power available for this period

摘要

The method involves using a pulse width modulation controler acted upon by a current limiting arrangement and that outputs pulses of controled duty cycle and essentially constant frequency. If the motor current exceeds an upper limit of the current limiting arrangement wheel the motor is rotating the limit is raised for a defined period to enable a higher motor power to be made available for this period. AN Independent claim is also included for the following: an electronically commutated motor for implementing the inventive method.