Adaptive PI Control Strategy for Flat Permanent Magnet Linear Synchronous Motor Vibration Suppression

• Published in: Chinese journal of mechanical engineering Vol. 26; no. 1; pp. 11 - 20
• Main Authors: Meng, Fanwei, Liu, Chengying, Li, Zhijun, Wang, Liping
• Format: Journal Article
• Language: Chinese; English
• Published: Beijing Chinese Mechanical Engineering Society 01.01.2013; Springer Nature B.V; Institute of Manufacturing Engineering, Tsinghua University, Beijing 100084, China
• Edition: English ed.
• Subjects: Adaptive control; Adaptive control systems; Computer simulation; Controllers; Damping ratio; Electric motors; Electrical Machines and Networks; Electromagnetic forces; Electronics and Microelectronics; Engineering; Engineering Thermodynamics; Heat and Mass Transfer; Instrumentation; Low pass filters; Machines; Manufacturing; Mechanical Engineering; Motors; Noise; Permanent magnets; PI; Power Electronics; Processes; Retarding; Step response; Strategy; Synchronous; Synchronous motors; Theoretical and Applied Mechanics; Vibration; Vibration control; 低通滤波器; 振动抑制; 控制策略; 永磁直线同步电机; 电流噪声; 电流控制器; 自适应; vibration suppression; permanent magnet motor; motor vibration; linear motor
• ISSN: 1000-9345; 2192-8258
• DOI: 10.3901/CJME.2013.01.011

Due to low damping ratio, fiat permanent magnet linear synchronous motor＇s vibration is difficult to be damped and the accuracy is limited. The vibration suppressing results are not good enough in the existing research because only the longitudinal direction vibration is considered while the normal direction vibration is neglected. The parameters of the direct-axis current controller are set to be the same as those of the quadrature-axis current controller commonly. This causes contradiction between signal noise and response. To suppress the vibration, the electromagnetic force model of the flat permanent magnet synchronous linear motor is formulated first. Through the analysis of the effect that direct-axis current noise and quadrature-axis current noise have on both direction vibration, it can be declared that the conclusion that longitudinal direction vibration is only related to the quadrature-axis current noise while the normal direction vibration is related to both the quadrature-axis current noise and direct-axis current noise. Then, the simulation test on current loop with a low-pass filter is conducted and the results show that the low-pass filter can not suppress the vibration but makes the vibration more severe. So a vibration suppressing strategy that the proportional gain of direct-axis current controller adapted according to quadrature-axis reference current is proposed. This control strategy can suppress motor vibration by suppressing direct-axis current noise. The experiments results about the effect of Kp and Ti on normal direction vibration, longitudinal vibration and the position step response show that this strategy suppresses vibration effectively while the motor＇s motion performance is not affected. The maximum reduction of vibration can be up to 40%. In addition, current test under rated load condition is also conducted and the results show that the control strategy can avoid the conflict between the direct-axis current and the quadrature-axis current under typical load. Adaptive PI control strategy can effectively suppress the flat permanent magnet linear synchronous motor＇s vibration without affecting the motor＇s performance.