直线超声电机驱动信号分析及其微步距输出特性研究

发布时间：2019-02-26 15:42

【摘要】：为了充分利用直线超声电机响应快、分辨率高的特点,并实现电机的微步距控制,研究了激励信号对电机微步距输出特性的影响。首先,通过分析电机的瞬态特性,研究了电机单步距作动过程;其次,为了实现电机激励信号的精确控制,分析了双PWM拓扑结构超声电机驱动器的工作原理,并通过实验对驱动器关断控制进行了研究;最后,分别研究了激励信号周期数、激励电压峰峰值和激励时间间隔对电机微步距特性的影响。实验结果表明,当驱动器采用具有泄放回路的零相位关断时,能够实现激励信号的精确控制。当以激励电压作为参变量,激励时间间隔大于10ms时,电机微步距特性曲线具有较强的线性特性,有利于电机微步距控制;激励时间间隔小于3ms时,能够有效降低电机平均速度,实现低速控制。
[Abstract]:In order to make full use of the fast response and high resolution of the linear ultrasonic motor and realize the micro-step control of the motor, the influence of the excitation signal on the micro-step output characteristic of the motor is studied. Firstly, through the analysis of the transient characteristics of the motor, the single step motion process of the motor is studied. Secondly, in order to realize the precise control of motor excitation signal, the working principle of ultrasonic motor driver with double PWM topology is analyzed, and the switch-off control of the driver is studied by experiments. Finally, the effects of the number of excitation signal periods, the peak and peak excitation voltage and the excitation time interval on the micro-step characteristics of the motor are studied. The experimental results show that the excitation signal can be precisely controlled when the driver adopts zero-phase turn-off with a drain loop. When the excitation voltage is taken as the parameter and the excitation time interval is larger than that of the 10ms, the micro-step characteristic curve of the motor has a strong linear characteristic, which is beneficial to the micro-step control of the motor. When the excitation time interval is less than 3ms, the average motor speed can be effectively reduced and the low speed control can be realized.
【作者单位】：机械结构力学及控制国家重点实验室(南京航空航天大学);
【基金】：国家自然科学基金项目(51275235)~~
【分类号】：TM359.9

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