摘要
为了提高中空型超声电机的输出效率,对电机定子的有效机电耦合系数进行了研究分析。首先,利用等效电路法分析了电机定子的压电阻抗特性,确定了有效机电耦合系数的计算方法;其次,通过ANSYS软件对电机定子的压电阻抗特性进行了有限元仿真,分析了定子的振动模态、金属弹性体和压电陶瓷的结构尺寸对有效机电耦合系数的影响;然后,根据仿真结果设计制作了4个不同的定子,并利用阻抗分析仪对4个定子进行了测试,实测值与仿真值进行对比,相对误差均小于10%,获得的阻抗特性曲线和仿真结果相吻合;最后,将4个定子装配成样机,并搭建了电机性能测试平台进行实验测试,4个样机均获得了较好的输出性能。实验结果表明,提高定子的有效机电耦合系数能获得较低的功耗,进而提高电机的输出效率,具有较高的工程应用价值。
In order to improve the efficiency of the hollow ultrasonic motor,the effective electromechanical cou⁃pling coefficient of the motor stator is analyzed.Firstly,the piezoelectric impedance characteristics of the motor stator are analyzed by using the equivalent circuit method,and the calculation method of the effective electrome⁃chanical coupling coefficient is determined.Then the finite element simulation of the piezoelectric impedance characteristics of the motor stator is carried out by ANSYS software,and the influence of the vibration mode of the stator,the structure size of metal elastomer and piezoelectric ceramic on the effective electromechanical cou⁃pling coefficient is analyzed.According to the simulation results,four different stators are designed and manufac⁃tured,and the four stators are tested by impedance analyzer.The relative errors between the measured values and the simulation values are less than 10%.The impedance characteristic curves obtained are consistent with the simulation results.Finally,the four stators are assembled into the prototype,and the motor performance test platform is built for experimental test.The results show that the four prototypes have achieved good output per⁃formance.Combined with the experiment,it is proved that increasing the effective electromechanical coupling coefficient of stator can obtain lower power consumption and improve the output efficiency of motor,which has high engineering application value.
作者
汪红星
刘军
朱华
潘政阳
WANG Hongxing;LIU Jun;ZHU Hua;PAN Zhengyang(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics Nanjing,210016,China)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2022年第6期1212-1219,1250,共9页
Journal of Vibration,Measurement & Diagnosis
基金
国家基础研究发展计划(“九七三”计划)资助项目(2015CB057501)
江苏高校优势学科建设工程资助项目。
关键词
中空超声电机
压电阻抗特性
有限元分析
有效机电耦合系数
输出性能
hollow ultrasonic motor
impedance characteristic
finite element analysis
effective electromechani⁃cal coupling coefficient
output performance
