Speed ​​estimation method and device for permanent magnet synchronous motor and permanent magnet synchronous motor

Abstract

A method, apparatus, and permanent magnet synchronous motor for speed estimation are provided. The method includes: acquiring the mechanical angle of the motor rotor at the current speed, and acquiring the current error angle between the actual position and the estimated position of the motor rotor at the current speed; setting an array, and setting the value of the element in the array corresponding to the mechanical angle at the current speed as the current error angle; acquiring the angle corresponding to the leading phase used to compensate for the rotor speed, determining the angle obtained by adding the mechanical angle and the angle corresponding to the leading phase, and adding the value of the element corresponding to the added angle in the array to the error angle; inputting the result of the addition into a phase-locked loop (PLL) controller, and estimating the motor speed through the PLL controller; and repeating the above steps. The solution of this invention can reduce the amplitude of the estimated speed fluctuation, ultimately making the estimated position more accurate, and thus obtaining better motor control performance.

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