Study of the Behavior of the Seismic Mass of a PWM Electrostatic Servo Accelerometer
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- TSUCHITANI Shigeki
- Intellectual Property Office, Hitachi, Ltd.
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- SUZUKI Seiko
- Hitachi Research Lab., Hitachi, Ltd.
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- KLOECK Ben
- University of Neuchatel
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- MIKI Masayuki
- Hitachi Research Lab., Hitachi, Ltd.
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- MATSUMOTO Masahiro
- Hitachi Research Lab., Hitachi, Ltd.
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- SATO Kazuo
- Mechanical Research Lab., Hitachi, Ltd.
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- KOIDE Akira
- Mechanical Research Lab., Hitachi, Ltd.
Bibliographic Information
- Other Title
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- PWM静電サーボ式加速度センサにおける質量部の挙動解析
- PWM セイデン サーボシキ カソクド センサ ニ オケル シツリョウブ ノ
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Abstract
The mechanical stability of the seismic mass (movable electrode) in a PWM electrostatic servo accelerometer which was fabricated by using a silicon micro-machining technique was studied theoretically and experimentally.<br>The movable electrode is controlled so as to be parallel to the fixed electrodes in the usual servo-operation. From an analysis using an energy model considering electrostatic energy of the electric field between the movable and the fixed electrodes and elastic energy of the cantilever beam which sustains the movable electrode, the occurrence of rotation of the movable electrode around a certain axis was expected at pulse voltages higher than a certain threshold voltage. This threshold voltage VT is proportional to the square root of the rotational spring constant of the cantilever beam when the movable electrode rotates around a certain axis.<br>This rotation phenomenon of the movable electrode was confirmed by optical observation of the sensor and the measured threshold voltages VT were in close agreement with those calculated by the above energy model.<br>The maximum measurable acceleration αmax in a PWM electrostatic servo accelerometer is proportional to the square of the pulse voltage which is restricted by the threshold voltage VT and is larger in the sensor structure with larger rotational spring constant of the cantilever beam. for example, αmax for a 2-beam sensor is larger than that for a 1-beam sensor.
Journal
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- Transactions of the Society of Instrument and Control Engineers
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Transactions of the Society of Instrument and Control Engineers 29 (3), 288-294, 1993
The Society of Instrument and Control Engineers
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Details 詳細情報について
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- CRID
- 1390001204500676608
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- NII Article ID
- 10006631134
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- NII Book ID
- AN00072392
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- ISSN
- 18838189
- 04534654
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- NDL BIB ID
- 3803838
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed