자기 베어링용 동위 와전류 변위 센서A Collocated Eddy-Current Displacement Sensor for Magnetic Bearings
- Other Titles
- A Collocated Eddy-Current Displacement Sensor for Magnetic Bearings
- Authors
- 김성학; 보응옥부; 안형준
- Issue Date
- Jan-2022
- Publisher
- 한국정밀공학회
- Keywords
- Magnetic bearing; Eddy-Current; Displacement sensor; Collocation; 자기 베어링; 와전류; 변위센서; 동위
- Citation
- 한국정밀공학회지, v.39, no.1, pp.29 - 33
- Journal Title
- 한국정밀공학회지
- Volume
- 39
- Number
- 1
- Start Page
- 29
- End Page
- 33
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/41676
- DOI
- 10.7736/JKSPE.021.091
- ISSN
- 1225-9071
- Abstract
- Magnetic bearings use electromagnetic force to support the rotating shaft without any mechanical contact and actively control shaft vibration; hence, there is no mechanical friction and wear due to contact during the operation, and it has a semi-permanent lifespan. Because magnetic bearings are unstable by themselves, a gap sensor is necessary to stably control the position of objects. However, there is a limit to the improvement in control performance because the sensor is installed on one side of the bearing and is not aligned with the electromagnet. This paper presents a newly developed collocated eddy-current PCB displacement sensor for magnetic bearings. The PCB sensor is designed and built to install between the poles of a magnetic bearing and to minimize the electromagnetic interference. A sensor calibration test is performed to evaluate the sensitivity and noise of the collocated PCB sensor. In addition, the control performance of the collocated PCB sensor is evaluated by measuring the closed-loop sensitivity function of a 1 DOF magnetic suspension test rig. The collocated PCB sensor has noise within ±1 μm and excellent vibration suppression performance.
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