Patent ID: 7518328

Claim:
A method for the commutation of electromechanical, commutatorless actuators, more particularly of permanent magnet motors and reluctance motors, having a rotor and a stator including at least one stator winding (W 1 , W 2 ) that is/are operated with a constant current (I), wherein a reference constant current is applied to at least one winding (W 1 , W 2 ) of the actuator, a stationary state is awaited in which the rotor is at standstill, a value that represents the voltage applied to the winding of the actuator in the stationary state is determined as the reference commutation value x 0 for the commutation voltage, and while the motor is running, the moment T is determined in which in the case of an operation with the reference constant current, the reference value appears or is being passed by, or in the case of an operating current that deviates from the reference current, a commutation value that is calculated from the reference value for the prevailing operating current appears or is being passed by, and in that the commutation is effected a predetermined time difference after the moment T, which time difference is greater than or equal to zero and is chosen such that essentially no polarity change of the actuator torque occurs.