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Sensors 2018, 18(2), 415; https://doi.org/10.3390/s18020415

A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring Effect

1
MEMS Center, Harbin Institute of Technology, Harbin 150001, China
2
Center for Integrated Spintronic Devices, Hangzhou Dianzi University, Hangzhou 310018, China
3
School of Software and Microelectronics, Harbin University of Science and Technology, Harbin 150001, China
4
Communication Research Center, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Received: 11 December 2017 / Revised: 14 January 2018 / Accepted: 26 January 2018 / Published: 31 January 2018
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [4596 KB, uploaded 31 January 2018]   |  

Abstract

Stable rotor levitation is a challenge for rotational gyroscopes (magnetically suspended gyroscopes (MSG) and electrostatically suspended gyroscopes (ESG)) with a ring- or disk-shaped rotor, which restricts further improvement of gyroscope performance. In addition, complicated pick-up circuits and feedback control electronics propose high requirement on fabrication technology. In the proposed gyroscope, a ball-disk shaped rotor is supported by a water-film bearing, formed by centrifugal force to deionized water at the cavity of the lower supporting pillar. Water-film bearing provides stable mechanical support, without the need for complicated electronics and control system for rotor suspension. To decrease sliding friction between the rotor ball and the water-film bearing, a supherhydrophobic surface (SHS) with nano-structures is fabricated on the rotor ball, resulting in a rated spinning speed increase of 12.4% (under the same driving current). Rotor is actuated by the driving scheme of brushless direct current motor (BLDCM). Interaction between the magnetized rotor and the magnetic-conducted stator produces a sinusoidal rotor restoring torque, amplitude of which is proportional to the rotor deflection angle inherently. Utilization of this magnetic restoring effect avoids adding of a high amplitude voltage for electrostatic feedback, which may cause air breakdown. Two differential capacitance pairs are utilized to measure input angular speeds at perpendicular directions of the rotor plane. The bias stability of the fabricated gyroscope is as low as 0.5°/h. View Full-Text
Keywords: gyroscope; ball-disk shaped rotor; driving scheme of brushless direct current motor (BLDCM); magnetic self-restoring effect; superhydrophobic surface (SHS); water-film bearing gyroscope; ball-disk shaped rotor; driving scheme of brushless direct current motor (BLDCM); magnetic self-restoring effect; superhydrophobic surface (SHS); water-film bearing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chen, D.; Liu, X.; Zhang, H.; Li, H.; Weng, R.; Li, L.; Rong, W.; Zhang, Z. A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring Effect. Sensors 2018, 18, 415.

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