基于场路结合的大功率直线超声波电机压电-热-结构多物理场分析  

Piezo-Thermal-Structure Coupling Analysis for High-Power Linear Ultrasonic Motor Based on Field-Circuit Combination Method

作　　者：李响 郭鹏涛 丁远 Li Xiang;Guo Pengtao;Ding Yuan(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009 China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《电工技术学报》2024年第2期423-433,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52105092)。

摘　　要：物理场分析对于大功率直线超声波电机的设计与优化至关重要,该文提出一种基于场路结合的超声波电机压电-热-结构多物理场解耦分析方法,解决了超声波电机传统多物理场分析方法无法兼顾分析效率与计算精度的问题。基于场的观点建立压电-结构耦合以及热-结构耦合有限元模型,基于路的观点构建定子电-振-热耦合损耗计算模型及其二维热网络模型,在此基础上通过超声波电机内部固有的电-振-热耦合效应实现压电-热-结构多物理场耦合分析,并实现了对多场耦合作用下电机作动性能、电气特性、温升特性以及关键部件机械强度的快速同步评估。利用该方法对一台V型定子大功率直线超声波电机进行理论建模与分析,仿真和实验结果表明,所提出的方法可为大功率直线超声波电机的多物理场分析及多场耦合优化设计提供理论参考。Due to high-voltage excitation,high-frequency mechanical vibration,and friction drive principle,high-power linear ultrasonic motors(HPLUMs)demonstrate complicated thermal-mechanical-electrical coupling dynamics under continuous operating conditions.Traditional field-based simulation methods and lumped parameter-based analytical methods are difficult to balance calculation accuracy and analysis efficiency when addressing the multi-physics coupled issues of ultrasonic motors.Existing multi-physics models for ultrasonic motors focus on stator performance rather than the comprehensive performance of motors under the multi-field coupling effect.Therefore,this paper proposes a field-circuit combination analysis methodology to analyze the piezo-thermal-structure multi-physics coupling of ultrasonic motors,considering the inherent electrical-vibration-thermal coupled effect.Furthermore,the electrical characteristics,temperature rise characteristics,actuating performance,and mechanical strength of critical components in HPLUMs under multi-field coupling effects can be evaluated.Firstly,the piezo-structure coupled finite element model(FEM)and thermal-structure coupled FEM for a V-shape HPLUM are constructed from the field viewpoint.Secondly,the stator’s electrical-vibration-thermal coupled loss model and a 2D thermal network model(TNM)are constructed from the circuit viewpoint.Thirdly,considering temperature-caused resonant frequency drifting behavior and real roughness at the contact interface,an analytical actuating performance model(APM)of the HPLUM is constructed.Finally,the results from modal and harmonic response analysis based on the piezo-structure coupled FEM are used as inputs into thermal-structure coupled FEM,circuit-based loss model and 2D TNM,and APM.The temperature rise for different stator components based on TNM is coupled to the thermal-structure coupled FEM,circuit-based loss model,and APM,forming a field-circuit combination calculation loop.Simulation results show complex nonlinear relationships betwe

关 键 词：超声波电机 多物理场 场路结合 性能评估 

分 类 号：TM35[电气工程—电机]