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 relates to a method for determining the position of an actuating element (3) in a positioning system (1), having the following steps: —continuously detecting a signal profile of a sensor signal from an acceleration sensor (7) which is fitted to an electric-motor actuating drive (5) of the positioning system (1), in order to detect an acceleration on account of a force excitation by a detent torque and/or an imbalance of a rotor of the electric-motor actuating drive; —evaluating the signal profile in order to detect an oscillation; —determining the position of the actuating element (3) on the basis of the detection of the oscillation.

Abstract: The invention relates to a method for determining the position of an actuating element (3) in a positioning system (1), having the following steps: continuously detecting a signal profile of a sensor signal from an acceleration sensor (7) which is fitted to an electric-motor actuating drive (5) of the positioning system (1), in order to detect an acceleration on account of a force excitation by a detent torque and/or an imbalance of a rotor of the electric-motor actuating drive; evaluating the signal profile in order to detect an oscillation; determining the position of the actuating element (3) on the basis of the detection of the oscillation.

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.

Abstract: The invention relates to a transmission device comprising a first gear wheel and a second gear wheel that is rotatably coupled thereto, wherein a damping element acting in the circumferential direction is provided axially between the gear wheels. According to the invention it is provided that the damping element can be tensioned by the gear wheels during the operation of the transmission device.

Abstract: The invention relates to a transmission device comprising a first gear wheel and a second gear wheel that is rotatably coupled thereto, wherein a damping element acting in the circumferential direction is provided axially between the gear wheels. According to the invention it is provided that the damping element can be tensioned by the gear wheels during the operation of the transmission device.