DOI QR코드

DOI QR Code

Torque Ripple Improving and Analysis of Coil-winding Rotor of Magnetic Gear

권선계자형 자기 기어의 고 토크 리플 회전자에 대한 분석 및 개선

  • Received : 2020.02.03
  • Accepted : 2020.04.15
  • Published : 2020.04.30

Abstract

Magnetic gears have the same characteristics as mechanical gears, and each rotor does not come in contact, which is advantageous over mechanical gears in friction noise, heat generation, and maintenance. In addition, when the rotor using the coil-winding is applied, it is possible to control the output of the gear as well as to cut off its own drive in the emergency situation and to change its gear ratio. So the application of the magnetic gear is infinite. However, when the coil-winding rotor is used, cogging torque due to the attraction force between the permanent magnet and the iron core appears, which leads to an increase in the torque ripple component causing the rotor vibration. Therefore, in this paper, various shapes of the coil-winding rotor are analyzed to reduce the torque ripple of the rotor, and the optimum shape for reducing the torque ripple of the magnetic gear is presented.

자기 기어는 기계식 기어와 동일하게 기어의 특성을 나타내면서 각 회전자가 접촉하지 않아 마찰에 의한 소음 및 발열, 유지보수문제에서 기계식 기어보다 유리하다. 또한 권선계자를 사용하는 회전자를 적용할 경우 기어의 출력조절은 물론, 기어비 및 위급상황에서 자체적인 구동차단까지 가능하여 자기 기어의 활용가능성은 무한하다. 하지만 권선계자를 사용할 경우 영구자석과 철심간의 흡인력에 의한 코깅토크가 나타나게 되고 이는 회전자의 진동을 유발하는 토크 리플성분의 증가로 이어진다. 따라서 본 논문에서는 권선계자를 사용하는 회전자의 토크 리플을 저감하기 위해 회전자의 다양한 형상을 분석하였으며, 자기 기어의 토크 리플을 저감하기 위한 최적의 형상을 제시하였다.

Keywords

References

  1. J. Woo, M. Suh, and J. Lee, "Study on Economic Evaluation of Solar Power Plant and Real Estate Asset Management Revenues," J. of the Korea Institute of Electronic Communication Sciences, vol. 13, no. 3, June 2018, pp. 633-642. https://doi.org/10.13067/JKIECS.2018.13.3.633
  2. Report on wind turbine subsystem reliability-A survey of various databases, "National Renewable energy laboratory(NREL)," Technical report, June 2013.
  3. H. Kim, W. Ju, and S. Kang, "A Fire Prevention System of the Nacelle of Wind Turbine Generator System Based on Broadband Powerline Communication," J. of the Korea Institute of Electronic Communication Sciences, vol. 13, no. 6, Dec. 2018, pp. 1229-1234. https://doi.org/10.13067/JKIECS.2018.13.6.1229
  4. M. Jeong, C. Moon, Y. Chang, S. Lee, and S. Lee, "A study on Design of Generation Capacity for Offshore Wind Power Plant : The Case of Chonnam Province in Korea," J. of the Korea Institute of Electronic Communication Sciences, vol. 13, no. 3, June 2018, pp. 547-553. https://doi.org/10.13067/JKIECS.2018.13.3.547
  5. K. Atallah, S. Calverley, and D. Howe, "Design, analysis and realisation of a highperformance magnetic gear," IEE Proc.-Electr. Power Appl., vol. 151, no. 2, Mar. 2004, pp. 135-143. https://doi.org/10.1049/ip-epa:20040224
  6. K. Atallah and D. Howe, "A novel high-performance magnetic gear," IEEE Trans. Magnetics, vol. 37, no. 4, July 2001, pp. 2844-2845. https://doi.org/10.1109/20.951324
  7. C. Gim, E. Park, and Y. Kim, "A Study on the Structure of Hybrid Magnetic Gear with Armature Type Rotor," J. of the Korea Institute of Electronic Communication Sciences, vol. 13, no. 6, Dec. 2018, pp. 1235-1241. https://doi.org/10.13067/JKIECS.2018.13.6.1235
  8. S. Kim, D. Kim, D. Lee, C. Gim, and Y. Kim, "Analysis of Efficiency and Loss due to Number of Poles in Magnetic Gears," J. of the Korea Institute of Electronic Communication Sciences, vol. 13, no. 5, Oct. 2018, pp. 1023-1028. https://doi.org/10.13067/JKIECS.2018.13.5.1023
  9. N. Frank and H. Toliyat, "Analysis of the Concentric Planetary Magnetic Gear With Strengthened Stator and Interior Permanent Magnet Inner Rotor," IEEE Trans. Industry applications, vol. 47, no. 4, July 2011, pp. 1652-1660. https://doi.org/10.1109/TIA.2011.2154291
  10. C. Kim, E. Park, S. Kim, and Y. Kim, "An Study on Pole Piece Shape for Improving Torque Ripple of Magnetic Gears," J. of the Korea Institute of Electronic Communication Sciences, vol. 12, no. 6, Dec. 2017, pp. 1065-1070. https://doi.org/10.13067/JKIECS.2017.12.6.1065
  11. E. Park, C. Kim, S. Jung, and Y. Kim, "Analysis of Torque Characteristics according to Non-uniform Air Gaps of Coaxial Magnetic Gear," J. of Magnetics, vol. 23, no. 4, 2018, pp. 675-679. https://doi.org/10.4283/jmag.2018.23.4.675