Patent ID: 8102143
Filing Date: 2012-01-24
Classification: H02P

Abstract:
1. An electric unit, comprising: a stator; a rotor, wherein the stator and the rotor form a drive system to drive the rotor and an energy transmission system to supply the rotor with electrical energy; a common active part for the drive system and the energy transmission system, wherein windings and optionally permanent magnets in the rotor are provided; at least one rotor winding and at least one stator winding in the active part; a power converter for the output of the electrical energy, wherein the power converter is designed to impress an alternating voltage for a position detection function onto the rotor winding, wherein a frequency of the alternating voltage of the position detection function is selected such that there is adequate coupling despite field displacement from the stator due to eddy currents; and a detection device in the energy supply system to detect a current component generated by the alternating voltage in the stator winding and for determination of the position of the rotor from the current component.