Conti Temic Microelectronic Gmbh

Audi Ag

Daimler Chrysler Ag

Georg Kaeufl

Klaus Spreng

Wolfgang Schulter

Johann Schneider

Erwin Kessler

Erich Liepold

Bernhard Schwantner

Reinhold Roedel

Werner Pollersbeck

A method controls a motor using pulse width modulation (PWM). The method involves measuring the PWM frequency; determining the carrier frequency of a set radio transmitter; and matching the PWM frequency to the carrier frequency of the radio transmitter in such a manner that an integer multiple of the PWM frequency corresponds to the carrier frequency or an integer multiple of the PWM frequency lies in the middle between two carrier frequencies.

Method for controlling a motor using pulse width modulation (PWM)

An electric drive unit provides a simple and economical electrical connection of an electric motor and an electronic module. The commutator of the electric motor, a brush rocker ring arranged on the commutator, and the drive shaft of the electric motor as well as the carrier body of the electronic module are inserted into a transmission housing. In the transmission housing, the carrier body of the electronic module is positioned so that contact elements provided on the brush rocker ring engage into contact points provided on the carrier body of the electronic module. The electric drive unit can be used for window lifter drives.

Electric drive unit consisting of an electromotor and an electronic module

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.

Method and circuit arrangement for detecting motion, direction and position of a part driven by an electric motor

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Maierhofen, Germany

Georg Kaeufl