基于模糊PI并联控制的超声传输系统频率跟踪  

Frequency Tracking for Ultrasonic Transportation System Based on Fuzzy PI Parallel Control

作　　者：夏旭峰[1] 李锦[1] 张亭[1] 刘长军[1] 

机构地区：[1]华东理工大学,上海200237

出　　处：《微特电机》2016年第11期46-50,共5页Small & Special Electrical Machines

基　　金：国家自然科学基金项目(51305138);上海市自然科学基金项目(13ZR1453300)

摘　　要：针对换能器频率偏移值与相位差的关系无法用精确时域模型表达,基于模型进行设计的经典控制器适用性降低,提出模糊PI并联控制实现超声传输系统频率跟踪。推导得出换能器两端电压与电流关系的时域模型,基于频谱分析法,设计鉴相器得到两者的相位差用于频率跟踪仿真分析。搭建超声传输系统,利用Lab VIEW设计扫频程序得到在工作电压下超声传输系统的初始谐振频率。仿真和实验结果验证了该控制方法的有效性。实验结果表明相比于传统的PI控制,模糊PI并联控制提高了控制精度,使超调量减少超过60%,最大误差减小超过50%,悬浮滑块加速度值提高2.1%。The time domain model can not be established for the resonant frequency variation according to the phase difference. Classical controller design based on this time domain model is not efficient in frequency tracking, so a fuzzy PI parallel control has been proposed in this paper. The time domain model was established for the voltage and current of the transducer. Based on the spectrum analysis, a phase discriminator was designed to get the phase difference of the voltage and the current. The non-contact ultrasonic transportation system was then built. A frequency sweeping method was pro- posed to get the initial starting frequency under working voltage. Simulation and experimental results verified the effective- ness of the fuzzy PI parallel control. Experimental results indicated that fuzzy PI parallel control had higher precision. The overshoot and maximum error was reduced by more than 60% and 50%, respectively. The acceleration of the levitated ob- ject was increased by 2.1%, compared with common PI controller.

关 键 词：近场超声 非接触传输 压电换能器 等效电路 频率跟踪 

分 类 号：TM359.9[电气工程—电机]