Journal
IEEE SENSORS JOURNAL
Volume 22, Issue 21, Pages 20352-20359Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2022.3206112
Keywords
Displacement detection; magnetic bearing; sensing coil
Funding
- Natural Science Foundation of Hubei Province [ZRMS2020001244]
- National Natural Science Foundation of China [51825703]
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This novel displacement detection method reduces the influence of excitation coils on displacement detection and improves sensitivity. By using a core multiplexing and frequency discrimination method, it can detect displacements along x- and y-directions simultaneously. Experimental results demonstrate the practical application value of this method in an active magnetic bearing system at 2500 rpm.
This article presents a novel displacement detection method with sensing coils weakly coupled with a conventional eight-pole active magnetic bearing. To improve integration, the sensing coils are completely wound on the magnetic poles of the active magnetic bearing. The proposed method is different from others since each sensing coil is wound around two teeth of an activemagnetic bearing, reducing the mutual inductance coefficient between sensing and excitation coils. Thus, the influence of excitation coils on displacement detection can be reduced. A core multiplexing and frequency discrimination method is proposed to detect displacements along x- andy- directions, simultaneously. Experiment results show that sensitivity along the x- and y- axes are 8.98 and 5.61 mV/mu m, respectively, showing the feasibility of displacement detection without being affected by displacement variation of the orthogonal axis. Finally, the displacement detected by sensing coils is used for close loop control in an active magnetic bearing system at 2500 rpm, validating the feasibility of sensing coils in active magnetic bearing control.
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