Patent ID: 6982534

Claim:
A method for operating an electronically commutated DC motor that is equipped with a current limiting arrangement which acts on a PWM controller that, in operation, delivers PWM pulses ( 60 ) having a controllable pulse duty ratio (pwm) and a substantially constant frequency, which current limiting arrangement, in the event a predetermined upper limit value (I soll ) of the motor current is exceeded, effects a change in the pulse duty factor, of the pulses ( 60 ) delivered by that PWM controller in order to reduce the motor current, comprising the steps of: monitoring whether the motor current (I ist ) exceeds the predetermined upper limit value (I soll ) of the current limiting arrangement; if the motor current (I ist ) exceeds the predetermined upper limit value (I soll ) while the motor ( 10 ) is rotating, raising that limit value during a predetermined time span (T 1 ) in order to make more motor power available during that time span.