A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring Effect
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 f...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-01-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/2/415 |
| _version_ | 1798004015013822464 |
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| author | Dianzhong Chen Xiaowei Liu Haifeng Zhang Hai Li Rui Weng Ling Li Wanting Rong Zhongzhao Zhang |
| author_facet | Dianzhong Chen Xiaowei Liu Haifeng Zhang Hai Li Rui Weng Ling Li Wanting Rong Zhongzhao Zhang |
| author_sort | Dianzhong Chen |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T12:16:51Z |
| format | Article |
| id | doaj.art-26d05f391c574680a6fe41b1d1882bc9 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T12:16:51Z |
| publishDate | 2018-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-26d05f391c574680a6fe41b1d1882bc92022-12-22T04:24:15ZengMDPI AGSensors1424-82202018-01-0118241510.3390/s18020415s18020415A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring EffectDianzhong Chen0Xiaowei Liu1Haifeng Zhang2Hai Li3Rui Weng4Ling Li5Wanting Rong6Zhongzhao Zhang7MEMS Center, Harbin Institute of Technology, Harbin 150001, ChinaMEMS Center, Harbin Institute of Technology, Harbin 150001, ChinaMEMS Center, Harbin Institute of Technology, Harbin 150001, ChinaCenter for Integrated Spintronic Devices, Hangzhou Dianzi University, Hangzhou 310018, ChinaSchool of Software and Microelectronics, Harbin University of Science and Technology, Harbin 150001, ChinaMEMS Center, Harbin Institute of Technology, Harbin 150001, ChinaMEMS Center, Harbin Institute of Technology, Harbin 150001, ChinaCommunication Research Center, Harbin Institute of Technology, Harbin 150001, ChinaStable 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.http://www.mdpi.com/1424-8220/18/2/415gyroscopeball-disk shaped rotordriving scheme of brushless direct current motor (BLDCM)magnetic self-restoring effectsuperhydrophobic surface (SHS)water-film bearing |
| spellingShingle | Dianzhong Chen Xiaowei Liu Haifeng Zhang Hai Li Rui Weng Ling Li Wanting Rong Zhongzhao Zhang A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring Effect Sensors gyroscope ball-disk shaped rotor driving scheme of brushless direct current motor (BLDCM) magnetic self-restoring effect superhydrophobic surface (SHS) water-film bearing |
| title | A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring Effect |
| title_full | A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring Effect |
| title_fullStr | A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring Effect |
| title_full_unstemmed | A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring Effect |
| title_short | A Rotational Gyroscope with a Water-Film Bearing Based on Magnetic Self-Restoring Effect |
| title_sort | rotational gyroscope with a water film bearing based on magnetic self restoring effect |
| topic | gyroscope ball-disk shaped rotor driving scheme of brushless direct current motor (BLDCM) magnetic self-restoring effect superhydrophobic surface (SHS) water-film bearing |
| url | http://www.mdpi.com/1424-8220/18/2/415 |
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