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Analysis and control of micro-stepping characteristics of ultrasonic motor

Frontiers of Mechanical Engineering volume 15, pages585–599(2020)Cite this article

Abstract

Micro-stepping motion of ultrasonic motors satisfies biomedical applications, such as cell operation and nuclear magnetic resonance, which require a precise compact-structure non-magnetization positioning device. When the pulse number is relatively small, the stopping characteristics have a non-negligible effect on the entire stepwise process. However, few studies have been conducted to show the rule of the open-loop stepwise motion, especially the shutdown stage. In this study, the modal differences of the shutdown stage are found connected with amplitude and velocity at the turn-off instant. Changes of the length in the contact area and driving zone as well as the input currents, vibration states, output torque, and axial pressure are derived by a simulation model to further explore the rules. The speed curves and vibration results in functions of different pulse numbers are compared, and the stepwise motion can be described by a two-stage two-order transfer function. A test workbench based on the Field Programmable Gate Array is built for acquiring the speed, currents, and feedback voltages of the startup-shutdown stage accurately with the help of its excellent synchronization performances. Therefore, stator vibration, rotor velocity, and terminal displacements under different pulse numbers can be compared. Moreover, the two-stage two-order model is identified on the stepwise speed curves, and the fitness over 85% between the simulation and test verifies the model availability. Finally, with the optimization of the pulse number, the motor achieves 3.3 µrad in clockwise and counterclockwise direction.

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Acknowledgements

The authors acknowledge the financial support from the National Basic Research Program of China (973 Program) (Grant No. 2015CB057503). The authors declare no conflict of interest.

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Affiliations

  1. College of Intelligence Science and Technology, National University of Defence and Technology, Changsha, 410073, China

    Ning Chen, Jieji Zheng, Xianliang Jiang, Shixun Fan & Dapeng Fan

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  1. Ning Chen
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  2. Jieji Zheng
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  3. Xianliang Jiang
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  5. Dapeng Fan
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Corresponding author

Correspondence to Dapeng Fan.

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Chen, N., Zheng, J., Jiang, X. et al. Analysis and control of micro-stepping characteristics of ultrasonic motor. Front. Mech. Eng. 15, 585–599 (2020). https://doi.org/10.1007/s11465-019-0577-3

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Keywords

  • ultrasonic motor
  • stepping characteristics
  • pulse number control
  • synchronous acquisition system
  • precise positioning