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http://dx.doi.org/10.3795/KSME-A.2008.32.3.232

Design of Fault-Tolerant Inductive Position Sensor  

Paek, Sung-Kuk (충남대학교 BK21 메카트로닉스사업단)
Park, Byeong-Cheol (한국전력 연구원)
Noh, Myoung-Gyu D. (충남대학교 메카트로닉스공학)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.32, no.3, 2008 , pp. 232-239 More about this Journal
Abstract
The position sensors used in a magnetic bearing system are desirable to provide some degree of fault-tolerance as the rotor position is necessary for the feedback control to overcome the open-loop instability. In this paper, we propose an inductive position sensor that can cope with a partial fault in the sensor. The sensor has multiple poles which can be combined to sense the in-plane motion of the rotor. When a high-frequency voltage signal drives each pole of the sensor, the resulting current in the sensor coil contains information regarding the rotor position. The signal processing circuit of the sensor extracts this position information. In this paper, we used the magnetic circuit model of the sensor that shows the analytical relationship between the sensor output and the rotor motion. The multi-polar structure of the sensor makes it possible to introduce redundancy which can be exploited for fault-tolerant operation. The proposed sensor is applied to a magnetically levitated turbo-molecular vacuum pump. Experimental results validate the fault-tolerance algorithm.
Keywords
Fault-Tolerance; Inductive Position Sensor;
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Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 0
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