Method for determining position of rotor of brushless direct current motor, involves correlating cyclically occurring electrical signals with load acting on rotor of motors, for determining position of rotor in relation to load on motors

摘要

The method involves measuring a time period of cyclically occurring electrical signals e.g. voltage and/or electric current (14a), of a motor phase of electric motors. The cyclically occurring electrical signals are correlated with load acting on a rotor of the electric motors, for determining position of the rotor in relation to mechanical load on the electric motors. Degaussing time is set with respect to current flowing along winding of a stator of the electric motors. Average of the cyclically occurring electrical signals is determined over time. An independent claim is also included for an electrical controller unit.