Patent ID: 8264180
Filing Date: 2012-09-11
Classification: H02K

Abstract:
1. A method for evaluating a sensor signal that is generated during rotations of a motor armature of a drive motor, wherein the motor armature is configured to permit flow of an armature current therethrough, and the drive motor comprises a motor magnet that generates a magnetic exciter main field, wherein the sensor signal comprises a first signal component that is generated as a result of a change in magnetic flux density of the magnetic exciter main field, and a second signal component that is generated as a result of a transverse field component of an armature transverse field at a sensor position and that is dependent on the absolute value of the armature current, the method comprising filtering out the second signal component from the sensor signal in order to determine the current motor torque of the drive motor, and assigning each rotation of the motor armature a number of signal pulses that corresponds to a number of armature teeth.