Magnetic-Field Modulation Principle and Transmission Ratio Calculation of Field-Modulated Asynchronous Magnetic Coupling

Abstract:

A field-modulated asynchronous magnetic coupling is a new type of composite magnetic transmission mechanism, which is based on the principles of magnetic field modulation and electromagnetic induction. The rotational velocity and direction of the inner conductor rotor could be changed, since the magnetic field generated by permanent magnet outer rotor is modulated by ferromagnetic pole-pieces. Therefore, the couplings can meet special conditions with special requirements for load and speed. The formula of the modulated magnetic flux density of inner air gap is analyzed through magnetic field analytic approaches, and then the formula of transmission ratio is also deduced by introducing slip ratio in the mean time. Finally, experimental research of the coupling is conducted. The results show that the transmission ratio of the coupling is not only related to the ratio of the number of pole pairs on outer permanent magnet rotor and the number of pole pairs of magnetic field flux density harmonic, but also related to the slip ratio. Besides, the transmission ratio of the coupling increases non-linearly with the slip ratio.

• Periodical: Applied Mechanics and Materials (Volume 535)
• Pages: 48-52
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.535.48
• Online since: February 2014
• Authors: Chao Jun Yang*, Dan Lu, You Hu, Xiao Ping Chen, Ru Yu Ma, Ling Ying Kong
• Keywords: Asynchronous Magnetic Coupling, Field Modulation, Slip Ratio, Transmission Ratio

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DOI: 10.1049/ip-epa:20040224