Measurement of attitude angles of single stator multi-degrees of freedom ultrasonic motor

Wu-fal Liu; Zheng Tao; Lin-na Zhang; Jian-she Gao; Feng-xia Zhao; Peng Zhen

doi:10.1117/12.885479

28 December 2010 Measurement of attitude angles of single stator multi-degrees of freedom ultrasonic motor

Wu-fal Liu, Zheng Tao, Lin-na Zhang, Jian-she Gao, Feng-xia Zhao, Peng Zhen

Proceedings Volume 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation; 754429 (2010) https://doi.org/10.1117/12.885479
Event: Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 2010, Hangzhou, China

Abstract

In order to measure the attitude angles of our ultrasonic motor, a compact single stator multi-degree-of freedom (DOF) ultrasonic motor with a cylindrical stator and a spherical rotor is designed with one OEM encoder and 2D PSD (Position Sensitive Detector) sensor. The spherical rotor is rotated around three perpendicular axes by three natural vibrations excited on the stator. The OEM encoder disc is fixed on the rotor output shaft to measure the rotational angle of the output shaft. The PSD sensor is installed in loading sphere, and one LED is installed in the LED house, the line light emitted by the LED transmits along the output shaft axis and passes through the center of the spherical rotor, and then projects on the PSD surface, and the PSD and LED comprise the device to measure the pitch and roll of the rotor. The output current signals of the PSD sensor are changed into voltages, amplified by measuring circuits, converted into digital signals, and are transmitted to MCU. The attitude angles of the motor are calculated out using the proposed algorithm. The compact structure design of the motor makes the measurement of the attitude angles of the multi-DOF ultrasonic motor more practical and convenient.

Citation Download Citation

Wu-fal Liu, Zheng Tao, Lin-na Zhang, Jian-she Gao, Feng-xia Zhao, and Peng Zhen "Measurement of attitude angles of single stator multi-degrees of freedom ultrasonic motor", Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 754429 (28 December 2010); https://doi.org/10.1117/12.885479

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KEYWORDS

Ultrasonics

Spherical lenses

Light emitting diodes

Sensors

Computer programming

Optical spheres

Structural design

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