Drive Authorization System for an Electric Drive

A drive authorization system for an electric drive includes a predefined number of field coils and a rotationally movable element. An evaluation and control unit for operation of the electric drive determines the current position of the movable element from several items of positional information, which can be made available by a predefined number of angle of rotation sensors. To implement an electronic immobilization function, positions, the number of the active rotation angle sensors, or both those positions and that number are made encodable. The evaluation and control unit decodes the encoded positional information of the active rotation angle sensors in order to determine the current position of the movable element. Operation of the electric drive is possible only after successful decoding of the positional information.