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Rotor position estimation apparatus and methods

  • US 9,774,284 B2
  • Filed: 02/19/2015
  • Issued: 09/26/2017
  • Est. Priority Date: 02/19/2015
  • Status: Active Grant
First Claim
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1. An estimation system for estimating a rotor position of a motor load driven by an inverter, wherein the estimation system:

  • converts each of four sets of multiphase inverter output current samples obtained at four different sample times in a given inverter pulse width modulation cycle into a corresponding pair of stationary reference frame current values, the given inverter pulse width modulation cycle having a duration equal to a complete cycle of a carrier waveform used in generating pulse width modulated switching signals to control an output of the inverter, andcomputes an estimated rotor position for the given inverter pulse width modulation cycle according to the stationary reference frame current values for the given inverter pulse width modulation cycle;

    wherein the four sets of multiphase inverter output current samples are sampled by the estimation system approximately at peaks, valleys and mid-points of one of a plurality of phase shifted carriers used to operate the inverter in the given inverter pulse width modulation cycle wherein a control circuit implements closed loop control of the inverter to control operation of the motor load at least partially according to the estimated rotor position.

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