基于锁相环电路的超声波电机频率跟踪系统

作者：孙中记,郭吉丰 日期：2008-06-23/span> 浏览：3354 查看PDF文档

基于锁相环电路的超声波电机频率跟踪系统

孙中记,郭吉丰
(浙江大学 电气工程学院，浙江 杭州 310027）

摘要：因各种原因,超声波电机在运行过程中会发生谐振频率漂移现象，进而导致电机转速下降、效率降低，因此，为了实现超声波电机驱动电源频率跟踪的功能，提出了相位差比较法，即保持电机一相驱动电压与电流的相位差恒定不变，来达到频率跟踪的目的，并采用锁相环（PLL）CD4046实现了超声波电机的频率跟踪。最后通过实验验证了该方法的可行性。
关键词：超声波电机；频率跟踪；锁相环
中图分类号：TM359.9文献标识码：A文章编号：1001-4551(2008)05-0058-04

Frequency tracking system for ultrasonic motor based on PLL circuit
SUN Zhongji， GUO Jifeng
(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)
Abstract: As running, the resonant frequency of ultrasonic motor will drift, which then leads to the decrease of speed and the decline of efficiency. For realizing the function of frequency tracking in driving power, the fundamental of frequency tracking based on keeping voltagecurrent phase difference unchanged was expounded, and the frequency tracking system for ultrasoinc motor was realized with phaselocked loop (PLL) CD4046. In conclusion, experimental results prove that the method is feasible.
Key words: ultrasonic motor; frequency tracking; phaselocked loop (PLL)