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Rotor position detection in an electrical machine

  • US 7,640,128 B2
  • Filed: 06/23/2005
  • Issued: 12/29/2009
  • Est. Priority Date: 07/06/2004
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • determining error in the output of a rotor position transducer that directly detects a position of a rotor of an electrical machine and that outputs first signals, the determining including;

    operating the electrical machine so as to produce the first signals and to produce, from a sensorless position detection algorithm, second signals representing an estimate of the position of the rotor, the sensorless position detection algorithm producing the second signals independently of and without reference to the first signals; and

    comparing the first and second signals to produce an error value representing the error in the output of the rotor position transducer; and

    storing the error value;

    wherein the rotor position transducer provides binary first signals and is arranged in relation to the rotor of the electrical machine to produce no more than two transitions in the binary first signals in a phase inductance cycle.

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