Zf Automotive UK Limited

Zf Active Safety and Electronics US LLC

Zf Friedrichshafen Ag

Trw Limited

Trw Automotive U.S. LLC

Prerit Terway

Christopher David Dixon

Connel Brett Williams

Peter Geoffrey Scotson

Mesut Er

Hassan Lamsahel

Abraham Ghafari

Abraham Ghaphery

A control system for an electric motor comprises a controller which receives as an input a demanded motor current and produces at an output an intermediate voltage demand signal, a voltage demand signal correction means arranged to generate a voltage demand correction signal, and a combining means arranged to combine the intermediate voltage demand signal and the voltage demand correction signal to produce an actual voltage demand signal that is applied to the motor by pulse width modulation of the switches of a motor bridge driver. The correction signal compensates for unwanted non-linearities caused by interlock delays in the switching of the motor bridge switches.

Motor control system

A method of determining an electrical angle offset of a motor position sensor mounted to a multi-phase electric motor, the method comprising rotating a rotor of the multi-phase electric motor at a motor velocity using an external drive system, measuring a motor phase voltage of each phase of the multi-phase electric motor, the motor phase voltage comprising a back-EMF generated by the rotation of the motor, converting the motor phase voltage to a DQ reference frame to form a DQ motor phase voltage and calculating the electrical angle offset from the DQ motor phase voltages.

Motor position calibration

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Rochester Hills, MI, United States of America

Prerit Terway