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Sensorless optimum torque control for high efficiency ironless permanent magnet machine

  • US 8,803,454 B2
  • Filed: 07/12/2012
  • Issued: 08/12/2014
  • Est. Priority Date: 09/23/2008
  • Status: Active Grant
First Claim
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1. A method for sensorless torque control by determining a rotor position using terminal voltages and currents of an ironless permanent-magnet machine to perform sensorless motoring and/or generation operations, comprising:

  • obtaining instantaneous terminal voltages of the machine;

    transforming the instantaneous terminal voltages to a zero direct axis voltage and a non-zero quadrature axis voltage;

    filtering the transformed instantaneous terminal voltages;

    regulating the electrical frequency of the permanent-magnet machine such that the zero direct-axis voltage is adjusted to have a value of zero;

    determining a non-final electrical angle of the permanent-magnet machine by applying an integrator to the regulated electrical frequency of the machine;

    determining a final electrical angle of the of the machine by integrating the non-final electrical angle and an electrical angle from a previous calculation cycle; and

    regulating the current vector of the machine such that the current vector is perpendicular to the final electrical angle of the machine, thereby optimizing the torque of the machine.

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