GAN Yun-hua, JIN Long, HU Min-qiang, et al. Frequency Tracking Technology of Ultrasonic Motor Based on Phase-Locked Loop[J]. 2009, 14(2): 66-70.DOI:
基于锁相环的超声波电机频率跟踪控制技术
摘要
电压电流的相位差即阻抗角特性反映了电机定子的谐振特性
通过采集超声波电机工作时电压电流的相位差信号
运用锁相环原理锁定电机工作状态
实现了对超声波电机的闭环控制.此方法对电机结构没有特殊要求
无需设置孤极.实验证明通过跟踪电机工作时电压电流的相位差
可以补偿电机本身特性和温度变化等对电机运行的影响
使电机运行在初始设定工作状态
提高电机的输出效率.改变电路中比较器初始相位差设定值
电路可以跟踪相位差变化实现对超声波电机的稳速功能.
Abstract
Phase difference between voltage and current is called impedance phase characteristic which reflects stator’s resonance characteristic of ultrasonic motor(USM).Closed loop control of USM is realized in using phase-locked loop through gathering phase difference signal between voltage and current.Using this method there’s no need to set isolated pole.By experiments it is proved that the infection of temperature change to USM can be compensated by tracking phase difference