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Permanent magnet synchronous motor and controller therefor

  • US 7,714,529 B2
  • Filed: 05/04/2005
  • Issued: 05/11/2010
  • Est. Priority Date: 05/05/2004
  • Status: Expired due to Fees
First Claim
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1. A permanent magnet synchronous motor having a stator and a rotor, the stator having windings and the rotor comprising a plurality of permanent magnets, and a controller, the controller comprising:

  • two magnetic field sensors, each having a linear response to sensed magnetic field strength, the sensors being spaced by an angle A electrical degrees relative to the rotor, where angle A is greater than 0 degrees and less than 180 degrees or greater than 180 degrees and less than 360 degrees, for sensing the position of the rotor by sensing a magnetic field representative of the fields of the magnets of the rotor;

    normalizing means for producing first and second signals representing normalized orthogonal components of the outputs of the sensors; and

    energizing means for producing, from the said orthogonal components, sinusoidal currents for energizing the windings of the stator to drive the rotor, the energizing means including a transformer that transforms the normalized first and second signals into 3-phase synchronous sinusoidal waveforms;

    wherein the normalizing means produces the first and second signals with a uniform amplitude.

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