Abstract: A drive unit for an adjustment system for a motor vehicle has an adjustable element moved by an electric motor. The dive motor is operated electromagnetically. A magnetic field sensor is arranged on a pole pot or a housing of the drive motor to provide an electrical sensor signal dependent on a magnetic field. A control unit is configured to detect the magnetic field. The magnetic field varies on rotation of a rotor of the drive motor, so that a relative position change of the adjustable element can be derived from the electrical sensor signal.

Abstract: The invention concerns a drive unit for an adjustment system (1), in particular in a motor vehicle, with an adjustable element (2) moved by an electric motor, comprising: a drive motor (4) operated by an electromagnet, a magnetic field sensor (9) which is arranged on a pole pot (42) or a housing of the drive motor (4) in order to provide an electrical sensor signal dependent on the magnetic field, a control unit (7) which is configured to detect a magnetic field which varies on rotation of a rotor (44) of the drive motor (4), so that in particular a relative position change of the adjustable element (2) can be derived from the electrical sensor signal.