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The Precision Platform Driven by Linear Ultrasonic Motor and Research of Control Method

Author: MaoXinFeng
Tutor: SunZhiJun
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical and Electronic Engineering
Keywords: linear ultrasonic motor precision positioning DSP LabVIEW serial communication PID micro-step control
CLC: TM359.9
Type: Master's thesis
Year: 2011
Downloads: 71
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Abstract


With the rapid development of a number of fields in precision engineering, the demand for one of its key technologies-precise positioning technology, is also growing. It requires the system reaching micro/nano scale of the repeat positioning accuracy and resolution.Linear ultrasonic motor(LUSM) is a novel motor utilizing the mechanical vibration of elastic body in the ultrasonic frequency scale that is generated by the inverse piezoelectric effect of piezoelectric ceramics. Through the friction between the stator and the promoter, the slight vibration of elastic body converts to linear motion of the promoter. Because of its fast response, self-locking when power off and no motion conversion mechanism, it is suitable to be applied to precision positioning platform, to get higher positioning accuracy and resolution.Firstly, the original structure of linear ultrasonic motor is improved. And the new motor is used as a drive unit. With a high-precision linear rolling guide and a high-resolution grating encoder, a linear precision platform is established. It has the following features: simple structure, high guiding accuracy and good retention.Secondly, TMS320F2812DSP is selected as core controller. Through the serial communication with PC, a complete measurement and control platform is set up. Depending on the different actions, the communication protocol is designed. LabVIEW is used to develop a human-machine interface. DSP program is developed correspondingly, including serial communication and real-time control of motor.Thirdly, to realize accurate position control of the precision platform, PID algorithm is applied. But it can not achieve the desired objectives—accurate, smooth, fast and robust. Through the theoretical and experimental data analysis, the cause is catched that the inertial displacement of the platform is too large. Thanks to the control features of linear ultrasonic motor, with the advantage of its high move-resolution when stimulated by ultra-short pulse, micro-step control strategy is absorbed into the PID control. Finally, the positioning system attains a good performance and achieves the control objectives. The experimental results indicate that the repetition positioning accuracy is less than 0.5μm under different distances, and the movement is smooth.

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CLC: > Industrial Technology > Electrotechnical > Motor > A special motor > Other
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