Sensorless Vector Control System of Synchronous Reluctance Motor Based on Hybrid Control in Full Speed Domain

doi:10.3901/JME.2023.05.223

Abstract

Abstract: The special process of the knitting circular knitting machine requires its drive motor to have large starting and loading capacity and high steady-state operation accuracy. Synchronous reluctance motor is an ideal motor for knitting circular knitting machines. However, the sensorless control of the existing synchronous reluctance motor has the problem of low rotor position estimation accuracy. In this regard, a synchronous reluctance motor sensorless vector control system based on full-speed domain hybrid control is proposed. The pulsed high-frequency current injection method is used at zero speed and low speed, and an appropriate amplitude is injected into the d-axis of the estimated coordinate system. Use the high-frequency voltage signal to estimate the q-axis to estimate the rotor position; use the model reference adaptive method at medium and high speeds to estimate the rotor position by establishing a mathematical model and performing stability analysis on it; in order to achieve zero To switch between high-speed and low-speed to medium-high speed, an improved transition zone fusion observation scheme is proposed, and a sinusoidal saturation function is used to replace the traditional linear switching function for position fusion. In order to verify the effectiveness of the program, a platform was built for testing. The results show that the program has strong load capacity during the startup process, smooth and stable switching process, and small fluctuation during steady-state operation. It is a sensorless vector control method that is more suitable for large circular knitting motors.

Key words: circular knitting machine, synchronous reluctance motor, pulse high frequency current injection method, model reference adaptive method, hybrid control

CLC Number:

TG156

ZHANG Yongfei, LU Wenqi, YANG Liangliang, WU Wenjun, ZHU Qixin. Sensorless Vector Control System of Synchronous Reluctance Motor Based on Hybrid Control in Full Speed Domain[J]. Journal of Mechanical Engineering, 2023, 59(5): 223-234.

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