ROTOR-POSITION SENSOR ASSEMBLY AND METHOD FOR DETECTING A ROTOR POSITION

摘要

The invention relates to a method for operating an electric motor comprising a stator, an external rotor (40), the latter (40) having a sensor magnet (54) with a plurality of sensor poles (55), at least one rotor-position sensor (42, 44) that is connected to the stator and a rotor-position evaluation device. The method comprises the following steps: The rotor-position sensor(s) is/are used to generate at least one rotor-position signal that is dependent on the rotational position of the sensor magnet (54). The rotor-position signal or signals is/are fed to the rotor-position evaluation device, where it is or they are converted into at least one digital value with a resolution of at least 2 bits, whereby said signal or signals can also be converted into different digital values dependent on rotational positions inside the sector of the sensor pole. The invention also relates to an electric motor comprising a stator and an external rotor (40), the latter (40) having a sensor magnet (54) with a plurality SP of sensor poles (55), at least one rotor-position sensor (42, 44) for generating a rotor-position signal, a rotor-position evaluation device for generating an absolute value for the rotor position, said device comprising an A-D converter (144) with a resolution of at least 2 bits, the rotor-position sensor or sensors (42, 44) being connected to the A-D converter.