Robert Boschgmbh

Heiko Frey

Hubert Lamm

Joerg Sutter

Ingo Immendoerfer

Christian Stolz

Stefan Beyer

Tero Jaervelaeinen

Ralph Tobias

Gilles Schmitt

Alfons Kloenne

An apparatus and a method with which a more-precise indication of an rpm is possible even if a position signal continues to be absent. To that end, a counter state of a counter is evaluated and is set to zero at each position signal. If the expected position signal remains absent for an overly long time, an rpm is estimated on the basis of the counter state of the counter. In this way, an rpm change can rapidly be detected and compensated for.

Method and device for detecting a rotational speed comprising an estimation of a measured value at low rotational speeds

An electronically commutatable motor with a preferably three-phase excitation winding in the stator, which, in order to generate a torque for a permanent magnet rotor, can be connected to a direct current source via a motor control unit and a commutation device equipped with semiconductor switches. The motor is intended for use as a drive motor of a safety-critical auxiliary drive unit in a motor vehicle, in particular as the drive motor of an electrical power-assisted steering unit, wherein additional or existing switching means suppress or at least partially compensate for a braking moment that is generated by the motor in the event of a winding short and/or a malfunction in the semiconductor switches of the commutation device.

Electronically commutable motor

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Kuppenheim, Germany

Heiko Frey