Patent ID: 8901862

Claim:
A commutated electric drive, comprising: an electric motor; a sensor assembly that includes a magnetic field generator on a shaft of the electric motor and an analog Hall sensor stationary relative to a stator of the electric motor opposite to the magnetic field generator; and a controller for controlling windings of the electric motor, the controller including: a memory for storing a calibration Hall signal of the magnetic field of the magnetic field generator, measured using the Hall sensor, under predetermined environmental conditions over one shaft revolution; and a device configured to: compare an instantaneous Hall signal of the instantaneous magnetic field of the magnetic field generator, measured using the Hall sensor, with the calibration Hall signal; ascertain a deviation of the instantaneous magnetic field from the magnetic field under the predetermined environmental conditions; ascertain an angular position of the electric motor from the instantaneous Hall signal and the ascertained deviation; and control the commutated electric motor on the basis of the ascertained angular position.