Hall sensor alignment for BLDC motor

  • US 20050275361A1
  • Filed: 06/10/2005
  • Published: 12/15/2005
  • Est. Priority Date: 06/11/2004
  • Status: Active Grant
First Claim
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1. A control system for a multiphase DC motor, comprising:

  • a multiphase motor drive circuit;

    a circuit for outputting back-EMF signals from said motor drive circuit;

    Hall effect sensors and a circuit for outputting Hall signals from said sensors that are indicative of rotor position; and

    a calculating circuit for calculating a phase difference between a Hall signal and a back-EMF signal.

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