Iranian Journal of  Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Positioning by traveling wave ultrasonic motor via input pulse amplitude

Document Type : Original Article

Authors
1 MSc Student, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
2 Professor, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
3 PhD Student, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
Abstract
The purpose of this article is to position a travelling wave ultrasonic motor by applying controlled pulse inputs. An ultrasonic motor with a straight wire stator has been constructed for this purpose. In travelling wave ultrasonic motors, movement is generated by travelling waves, unlike worm-shaped ultrasonic motors that are easily positioned. Positioning with travelling wave motors is challenging, and no research has been reported in this field. In this study, a travelling wave is created inside the linear stator using a multi-layer piezoelectric. By identifying the desired frequency, the travelling wave is generated in the stator, causing the slider to move along it. The research aims to achieve the smallest movement step and precise positioning using the ultrasonic motor. The motor is moved by applying pulse voltages, and positioning is controlled by managing the range. To examine the vibration modes of the designed stator and extract usable modes for motor initiation, the natural frequencies of the piezoelectric stack and steel wire were analyzed using the finite element method. Correspondence between the natural frequencies obtained in the modal analysis and frequency response was observed. Finally, the smallest pulse causing slider movement was identified, and the minimum achievable displacement step was determined. The smallest displacement step achieved so far is 0.2 mm. Further research will investigate the possibility of achieving smaller steps.
Keywords

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