Robert Boschgmbh

Stefan Beyer

Joerg Sutter

Ingo Immendoerfer

Harald Witzig

Heiko Frey

Ralph Tobias

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

In a brushless direct-current drive with a synchronous motor ( ), which has a stator ( ) that supports a multi-phase stator winding ( ) and a rotor ( ) equipped with permanent magnet poles ( ), and with a switch unit ( ), which precedes the stator winding ( ), for commutating the stator winding ( ), in order to produce a fail-silent behavior, a field excitation winding ( ) is disposed in the rotor ( ), which winding can be supplied with current in the event of a malfunction so that it generates a magnetic flux oriented in the opposite direction from the magnetic flux of the permanent magnet poles ( ).

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Buehl, Germany

Stefan Beyer