Abstract: Disclosed is a method for detecting the current position of a rotor, in particular the angle of rotation of the rotor, an electromotor and a method for detecting the speed and/or the angle of rotation of an electromotor. The speed of the electromotor is hereby implied inter alia from the number of zero crossings of a comparison signal of the armature resistances or respectively conductances determined continuously in time and the average values of the armature resistances or respectively conductances determined continuously in time.

Abstract: Disclosed is a method for detecting the current position of a rotor, in particular the angle of rotation of the rotor, an electromotor and a method for detecting the speed and/or the angle of rotation of an electromotor. The speed of the electromotor is hereby implied inter alia from the number of zero crossings of a comparison signal of the armature resistances or respectively conductances determined continuously in time and the average values of the armature resistances or respectively conductances determined continuously in time.

Abstract: The displacement of a part e.g. window driven by an electromotor in a vehicle is controlled. A jam is identified by comparing a status value (e.g. current or speed) of the electromotor or the closure device with a characteristic value indicating a jam. The position of e.g. the part is detected. The displacement is controlled based on the identification of a jam and the position of the part. If a jam is indicated, the electromotor is stopped for a short time or is reversed. It is determined whether the position of the part has altered or is altering before and/or after the indicated jam. If so, the closing motion is continued, if not, it is assumed that a jam has occurred and the electromotor is reversed. The stopping or reversing time period is so short to be imperceptible to the naked eye.

Abstract: An electric motor for driving a component, such as a vehicle window lifter or a machine tool, functions as a generator, when the motor drive voltage is switched off and the motor is short circuited. The motor keeps running due to inertia or other influences. During this period after switch-off a generator voltage and respective generator current are produced. The generator current is measured for various purposes, preferably in combination with a measured r.p.m. signal. The generator current signal alone, or in combination with the r.p.m. signal, is evaluated to provide information regarding the motion of the driven component including information regarding the motion direction and position of the component.

Abstract: The invention relates to a method for controlling the displacement motion of a part, moved by an electromotor, of a closure device in a motor vehicle, for example, a window pane control, in the doors of the motor vehicle. A jamming incident is identified by a comparison of at least one status value of the electromotor or of the closure device which status value signifies a jamming incident, for example the motor current or the displacement speed, which a characteristic value that is significant for a jamming incident. In addition, the position of movable body parts, in particular the doors, is detected and the control of the displacement motion is adapted, in accordance with the identification of a jamming incident and the position of the body parts. If the result of the comparison indicates a jamming incident, the electromotor is Stopped for a predetermined short period of time that is preferably hardly perceptible, or the motor is reversed.

Abstract: An electric motor for driving a component, such as a vehicle window lifter or a machine tool, functions as a generator, when the motor drive voltage is switched off and the motor is short circuited. The motor keeps running due to inertia or other influences. During this period after switch-off a generator voltage and respective generator current are produced. The generator current is measured for various purposes, preferably in combination with a measured r.p.m. signal. The generator current signal alone, or in combination with the r.p.m. signal, is evaluated to provide information regarding the motion of the driven component including information regarding the motion direction and position of the component.