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Erschienen in:
2018 | OriginalPaper | Buchkapitel
Research on New Displacement Sensor Used in Active Magnetic Bearing Systems
verfasst von : Lian-Xiao Xue, Kai Zhang, Yang Xu
Erschienen in: Nuclear Power Plants: Innovative Technologies for Instrumentation and Control Systems
Verlag: Springer Singapore
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Abstract
Active magnetic bearings (AMBs) play an important role in the helium turbine of High Temperature Gas-cooled Reactor (HTR). As one of the main components of the AMB, the displacement sensor influences the performance of the whole AMB system. In this paper, a new radial displacement sensor which characterized by high cost-efficiency, high accuracy, high sensitivity, and compact structure is discussed. Through establishing an equivalent model of the sensor, the theory of the sensor was derived. Then, a finite element model was constructed to analyze various factors that affect the sensor sensitivity and structure. Furthermore, an experimental platform was built to evaluate the sensor. As a result, the sensor exhibited an original sensitivity of 38.94 mV/µm, a good linearity of 1.87% and a low X-Y coupling degree of 2.14%. This sensor was applied to an AMB system and achieved stable suspension at a speed of 12 000 rpm. It is expected to be extended to HTR related applications due to its excellent performance.