| As the manufacturing industry develops more and more in the direction of high,precision,and sharpness,its requirements for the drive device are getting higher and higher.Among micro motors,a driver that uses the inverse piezoelectric effect of piezoelectric materials and the frictional coupling between the stator and rotor to output mechanical quantities stands out with the advantages of micro-nano-level driving and rapid response,which is the ultrasonic driver.This paper has completed the following work around a two-degree-of-freedom tower linear ultrasonic driver:Based on the analysis of the driving mechanism of the ultrasonic driver,the finite element simulation software ANSYS was used to design and optimize the configuration of the driver.The optimization results reduced the two-phase operating frequency to 121Hz;on the basis of the determination of the size of the stator,the stator support and clamping structure was designed.The impedance characteristic experiment was carried out on the produced principle prototype,and the experimental results verified the successful production of the principle prototype.The different ultrasonic driver drive circuit schemes are compared and explained.The overall circuit design requirements are given based on the characteristics of the tower-type linear ultrasonic driver in this paper;a drive circuit design scheme that combines modularity and integration is adopted,and design the schematic diagram;test the output waveform of the manufactured drive circuit,and the experimental results show that the designed and processed drive circuit scheme generally meets the design requirements.The method of experimental exploration is used to firstly study the selection of the control mode of the tower-type linear ultrasonic driver;the PID control strategy and the fuzzy PID control strategy are theoretically introduced,and the corresponding closed-loop control simulation model is established using Simulink,and the simulation results are compared and analyzed which proves the superiority of fuzzy PID control in the field of linear ultrasonic drive control.Build a tower-type linear ultrasonic driver drive performance test experimental platform,and carry out experiments on the influence of drive signals on output speed;for the characteristics of two degrees of freedom,compare and explore the output performance differences in different directions;finally,the experiment explores the change of output speed under different loads and the load characteristics under the condition of two ultrasonic drivers.The above results lay the experimental foundation for the application of the tower linear ultrasonic drive to the precision transmission platform. |
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