Patent ID: 8766579

Claim:
A device for monitoring and correcting a rotor position of a brushless direct current motor ( 3 ), wherein a detection device ( 4 , 5 ) of the rotor position of the operating motor ( 3 ) is connected for transmission of detected inductance-based signals with a monitoring/correcting device ( 6 ) for monitoring the ambiguity of the rotor position detection and, as needed, for correcting the rotor position; a control device ( 1 ); and a current converter ( 2 ) with the motor ( 3 ), wherein the detection device ( 4 , 5 ) for transmission of the rotor position is connected with the control device ( 1 ), wherein the monitoring/correcting device ( 6 ) is connected to the control device ( 1 ) such that currents are changed in a targeted fashion in phases in which the magnet poles of the rotor are immediately oppositely positioned to each other, wherein actual switching states of the control device ( 1 ) and varied switching states of the monitoring/correcting device ( 6 ) derived therefrom are transmitted, wherein the monitoring/correcting device ( 6 ) for transmission of corrective values is connected with the detection device ( 4 , 5 ), wherein in the monitoring/correcting device ( 6 ), based on the detected inductance-based signals that are measured such that a time between two measurements is significantly below the dynamics of the motor ( 3 ) and based on an independently calculated PWM (pulse width modulation), a targeted current supply change, with compensation of the effect of reactive currents by the monitoring/correcting device ( 6 ), is integrated into a PWM pattern.