[ Technical Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 29, No. 5, pp.406-412

ISSN: 2508-5107 (Online)

Print publication date 15 Oct 2020

Received 21 Jul 2020 Revised 24 Aug 2020 Accepted 01 Sep 2020

DOI: https://doi.org/10.7735/ksmte.2020.29.5.406

편심 자석 로터의 내·외측 자기장 변조를 이용한 마그네틱 하모닉 기어

원훈희^a ; 정광석^a^{, *}

Magnetic Harmonic Gear that Utilizes the Inner and Outer Magnetic Field Modulation of Eccentric Magnet Rotor

Hoon Hee Won^a ; Kwang Suk Jung^a^{, *}

aDepartment of Mechanical Engineering, Korea National University of Transportation

Correspondence to: ^*Tel.: +82-43-841-5135 E-mail address: ksjung@ut.ac.kr (Kwang Suk Jung).

Abstract

In a magnetic harmonic gear, the magnetic field on the high-speed side is modulated by the air-gap movement according to the rotation of the eccentric body. Owing to the modulated magnetic field, the permanent magnet layer outside the high-speed rotor rotates in synchronization with the stator composed of another permanent magnet. Therefore, transferring only the synchronous rotational motion outside the eccentric body to the output side requires a complicated conversion mechanism. In this study, we propose a magnetic harmonic gear that utilizes both the inner and outer magnetic fields of an eccentric permanent magnet layer. The outer magnetic field is utilized for the deceleration function as in the existing harmonic gear, whereas the additional inner magnetic field is utilized to extract the rotational motion. The topology of the system is verified by the harmonic analysis of the air-gap magnetic field and with experimental set-up.

Keywords:

Eccentric rotation, Harmonic filtering, Magnetic harmonic gear, Noncontact power transmission, Sinusoidal air-gapping

References

Atallah, K., Calverley, S. D., Howe, D., 2004, Design, Analysis and Realization of a High Performance Magnetic Gear, IEE Proc.-Electr. Power Appl., 151:2 135-143. [https://doi.org/10.1049/ip-epa:20040224]
Rasmussen, P., Andersen, T., Jorgensen, F., Nielsen, O., 2005, Development of a High-performance Magnetic Gear, IEEE Trans. on Industry Applications, 41:3 764-770. [https://doi.org/10.1109/TIA.2005.847319]
Jian, L., Xu, G., 2011, Electromagnetic Design and Analysis of a Novel Magnetic-gear-integrated Wind Power Generator Using Time-stepping Finite Element Method, Progress In Electromagnetics Research, 113 351-367. [https://doi.org/10.2528/PIER10121603]
Frank, N., 2011, Analysis of the Concentric Planetary Magnetic Gear, Doctorate Thesis, Texas A&M University, USA.
Jung, K. S., 2020, Analysis of Pole Ratio Effect of Magnetic Reducer, J. of the Korea Academia-Industrial cooperation Society, 21:1 277-283.
Jorgensen, F., Andersen, T., Rasmussen, P., 2008, The Cycloid Permanent Magnetic Gear, IEEE Trans. on Industry Applications, 44:6 1659-1665.
Rens, J., Atallah, K., Calverley, S., Howe, D., 2010, A Novel Magnetic Harmonic Gear, IEEE Trans. on Industry Applications, 46:1 206-212. [https://doi.org/10.1109/TIA.2009.2036507]
Lee, S. J., Jung, K. S., 2015, Characteristic Study of a Magnet Gear Speed Reducer With a Unified Harmonic Modulator, J. Korean Soc. Manuf. Eng., 24:3 348-354. [https://doi.org/10.7735/ksmte.2015.24.3.348]

Hoon Hee Won

M.Sc. candidate in the Department of Mechanical Engineering, Korea National University of Transportation.His research interest is magnetic gear-embedded motor.

E-mail: rhgns0934@ut.ac.kr

Kwang Suk Jung

Professor in the Department of Mechanical Engineering, Korea National University of Transportation.His research interest include electromagnetic energy conversion device, magnetic gear, power transmission of electric vehicle, and magnetic levitation application.

E-mail: ksjung@ut.ac.kr