@article{HE2024, 
author = {Yang HE and Wangwang LI and Jinghua JI and Wenxiang ZHAO and Jihong ZHU},
title = {Sensorless control of servo motor based on adaptive amplitude-phase square wave injection},
year = {2024},
journal = {Acta Aeronautica et Astronautica Sinica},
volume = {45},
number = {15},
pages = {630211},
keywords = {sensorless control, servo system, permanent magnet synchronous motor, adaptive injection, high dynamic position estimation},
url = {https://www.sciopen.com/article/10.7527/S1000-6893.2024.30211},
doi = {10.7527/S1000-6893.2024.30211},
abstract = {Existing sensorless control methods are constrained by the convergence rate and estimation accuracy, and is difficult to be directly applied to high dynamic electro-mechanical servo systems. To improve the estimation accuracy of sensorless control under high dynamics, this paper proposes a novel sensorless control method for the permanent magnet synchronous motor based on amplitude-phase adaptive square wave injection. By injecting high-frequency square wave voltage signals and demodulating the high-frequency response current of the q-axis, high dynamic rotor position estimation is achieved. At the same time, the amplitude and phase of the injected voltage are adaptively adjusted according to the real-time operating status of the motor. Therefore, the estimation errors caused by inverter nonlinearity and motor cross-saturation effect are effectively reduced. Finally, the performance of the method proposed is experimentally verified on a 2 kW servo motor platform. The experimental results show that the proposed method can enhance the accuracy of rotor position estimation, while achieving high dynamic characteristics of sensorless control.}
}