×

Method and apparatus for position-sensorless motor control

  • US 6,583,593 B2
  • Filed: 10/11/2001
  • Issued: 06/24/2003
  • Est. Priority Date: 10/11/2000
  • Status: Expired due to Fees
First Claim
Patent Images

1. A position-sensorless motor control method comprising the steps of:

  • (A) determining a target current vector of stator windings;

    (B) setting one of a rotor-position estimation current signal and a rotor-position estimation voltage signal, with varying the period thereof;

    (C) detecting currents flowing through said stator windings;

    (D) carrying out one of (a) superimposing said rotor-position estimation current signal on a component of said target current vector in a first direction based on an estimated position (γ

    -axis direction, hereafter) of a rotor, thereby obtaining a target current vector with superimposed wave, and (b) superimposing said rotor-position estimation voltage signal on a component of a target voltage vector corresponding to said target current vector in said first direction, thereby obtaining a target voltage vector with superimposed wave;

    (E) supplying electric power to said stator windings through a motor driving device on the basis of one of said target current vector with superimposed wave and said target voltage vector with superimposed wave;

    (F) measuring a current response to one of said rotor-position estimation current signal and said rotor-position estimation voltage signal, from a component of a current vector in a second direction having a fixed relation with said first direction, said current vector representing said currents detected in said detecting step; and

    (G) correcting said γ

    -axis direction on the basis of said current response.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×