A method and device for detecting the position of a motor rotor, and a computer storage medium

Abstract

The present application discloses a detection method and device for the rotor position of a motor, and a computer storage medium. The detection method includes: obtaining the phase current observation value and the phase voltage observation value of the motor at the current moment in the two-phase stationary coordinate system; Phase voltage observation value, estimate the phase current estimation value at the current moment; calculate the phase current error value at the current moment according to the phase current observation value at the current moment and the phase current estimation value at the current moment; input the phase current error value at the current moment into the ratio The resonance controller is used to obtain the observed value of the opposite potential at the current moment; according to the observed value of the opposite potential at the current moment, the electrical angular frequency of the motor rotor at the current moment is calculated to obtain the position of the motor rotor. Through the above method, the adaptive resonance control is used as the approach rate of the sliding mode observer, which avoids the adverse effects of chattering in the traditional method, and also eliminates the additional low-pass filter and its phase compensation link, which improves the observation accuracy and steady state performance.

Description

technical field [0001] The present application relates to the technical field of motors, in particular to a method and device for detecting the position of a motor rotor, and a computer storage medium. Background technique [0002] The permanent magnet synchronous motor (PMSM) has the advantages of light weight, small size and high operating efficiency, and is widely used in the fields of household appliances and industrial automation. The traditional motor drive system needs to detect the rotor position of the motor through a position sensor, which not only increases the cost, but also reduces the reliability of the system. [0003] In recent years, the position sensorless control technology suitable for permanent magnet synchronous motors has developed rapidly, and how to accurately measure the rotor position of the motor has become an urgent problem to be solved. [0004] The sliding mode observer is a commonly used motor rotor position detection method. The phase curren...

AI Technical Summary

Problems solved by technology

Since the sign function or saturation function is used as the approach rate of the sliding mode surface, there must be a chattering phenomenon, and it is usually necessary to perform low-pass filtering and phase compensation on the opposite potential observations, which complicates the system design and reduces the performance of the observer , which in turn affects the control performance of the motor

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