第20卷第12期 2012年12月
文章编号
1004-924X(2012)12-271208
光学精密工程
Optics and Precision Engineering
数字驱动系统死区效应的双刷新补偿
王雷*，王龙，唐学军，林灿发
（哈尔滨工业大学超精密光电仪器工程研究所，黑龙江哈尔滨150080）
Vol.20No.12
Dec.2012
摘要：针对死区效应会导致永磁同步直线电机相电流失真、推力波动，从而限制其在精密气浮工作台等高精度、低频轻载场合应用的问题，提出了一种根据相电流极性改变驱动器输人信号脉冲宽度来补偿死区效应的方法，双刷新补偿法(DUDTC）。首先，分析了死区效应引起的驱动器输出信号脉冲宽度变化，给出了脉宽调制（PWM)信号上升潜和下降沿的补偿与相电流极性间的关系；然后，在Matlab/Simulink中对死区效应的影响和双剧新补偿法的作用进行仿真；最后，在直线气浮工作台系统中实现了双刷新补偿法。实验显示，该方法相位延退仅0.5个伺服周期，在电机速度开环和闭环下均使相电流畸变减小，波形正弦化。结果表明，双剧新补偿法能有效改善直线电机电流环性能，且代码量少、移植性好，适用于各类数字开关驱动系统。
关键词：死区补偿；永磁同步直线电机；精窑工作台；电流环
中图分类号：TM351
文献标识码：A
doi;10.3788/0PE,20122012.2712
Doubleupdatingdead-timecompensationfordigitaldrivesvstem
WANG Lei'，WANG Long，TANGXue-jun，LIN Can-fa
Institute ofUltra-precisionOptical&Electronic InstrumentEngineering,
Harbin Institute ofTechnology,Harbin150080,China)*Correspondingauthor,E-mail:hit_wanglei@163.com
Abstract: Dead-time effect results in distorted currents and force pulsations of Permanent Magnetic Linear Synchronous Motors(PMLSM),which limits the uses of precision stages in conditions of high accuracy, low frequency and lighter loadings, To compensate the Dead-time effect, this paper pro-posed a Double Updating Dead-time Compensation (DUDTC) method to correct each input pulse width of the motor driver according to phase current polarity. Firstly, the effect of dead-time on driv er output pulses was analyzed and the correlation between correction of Pulse Width Modulation(PWM) and phase current polarities was given. Then, the method was evaluated through simulations in Matlab/Simulink and experiments in a linear-stage system. The results indicate that the phase error of DUDTC is only 0. 5 servo periods and its phase current distortions is reduced. The DUDTC shows less codes and good portability, and is an efficient method to compensate the dead-time effect in digital drivesystems.
Key words: Permanent Magnetic Linear Synchronous Motor(PMLSM); dead-time compensation; pre
cision stage; current loop
收稿日期：2012-06-08；修订日期：2012-06-28.
基金项目：02科技重大专项资助项目（No.2009ZX02021)；国家自然科学基金资助项目（No.50905046）