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METHOD AND APPARATUS TO DETERMINE ROTATIONAL POSITION OF AN ELECTRICAL MACHINE

  • US 20080272717A1
  • Filed: 05/03/2007
  • Published: 11/06/2008
  • Est. Priority Date: 05/03/2007
  • Status: Active Grant
First Claim
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1. Control system for an electric machine comprising a multi-phase multipole motor having a stator, a rotor, and a rotor position sensing mechanism, comprising:

  • an inverter operable to transmit electrical energy between the stator of the electrical machine and an electrical storage device; and

    ,a controller, operable to;

    derive a rotor position based upon a sensorless position sensing technique;

    determine an offset parameter between the derived rotor position and a sensed rotor position; and

    ,control the inverter based upon the sensed rotor position and the offset parameter.

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