Affiliations: [a] Department of Electrical Engineering, Chosun University, Gwangju, Korea | [b] School of Information and Communication Engineering, Sungkyunkwan University, Suwon, Korea
Correspondence:
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Corresponding author: Yong-Jae Kim, Department of Electrical Engineering, Chosun University, Gwangju 61452, Korea. E-mail:kimyj21@chosun.ac.kr
Abstract: The magnetic gear that solves the physical contact
problem of the mechanical gear has advantage of no mechanical friction loss,
very little noise and vibration, and no need for lubricant. Due to this
unique non-contact characteristic, the magnetic gear which is capable of
non-contact torque transmission has replaced mechanical gear. However, the
magnetic gear with a high gear ratio is disadvantageous to implement the
exact gear ratio because the number of rotor poles increases. Therefore,
dual-stage type magnetic gear was proposed in order to distributes the gear
ratio by using two magnetic gears as to the mechanical gear is used the
multi-stage in order to implement the high gear ratio. The dual-stage type
magnetic gear can improve the power density and efficiency compared to the
single-stage magnetic gear. Also, the dual-stage type magnetic gear can be
designed differently permanent magnet type because the use of the two
magnetic gear. Therefore, in this paper, permanent magnet material of second
magnetic gear was not changed and only permanent magnet material of first
magnetic gear was changed to bonded NdFeB magnet or ferrite magnet from
sintered NdFeB magnet. Transfer torque and magnetic field analysis method
for dual-stage magnetic gear was used 2-D numerical analysis.
Keywords: Transfer torque, magnetic gear, gear ratio, rare-earth magnets, non rare-earth magnets, power transmission, finite element method
