Analysis and optimization of Triple-speed Coaxial Magnetic Gears

Document Type : Original Article

Authors

1 PhD student, Islamic Azad University, Central Tehran Branch, Tehran, Iran

2 Assistant Professor, Department of Electrical Engineering, Azad University, Central Tehran Branch, Tehran, Iran

3 Associate Professor, Electrical Department, Islamic Azad University, Ashtian Branch, Ashtian, Iran

Abstract

Besides introducing the triple-speed coaxial magnetic gear, the paper studies the influence of the geometric structure on torque and tangential and radial flux density. As rectangular and trapezoidal structures are more welcomed in most projects thanks to their ease of use, the present paper also introduces triple-speed coaxial magnetic gears with rectangular and trapezoidal structures. Then these gears are compared with           crescent-shaped magnetic gear using the finite element method. The comparison shows that rectangular magnetic gears are not much different from crescent-shaped gears in terms of the flux density on the edges and corners. However, flux density distribution is more desirable in the former as the air gap between the middle rotor and modulators is variable, and less oscillation is experienced considering tangent and radial flux density distributions. Nonetheless, the trapezoidal structure presents unsatisfactory performance in comparison to the crescent-shaped structure in terms of flux density distribution and torque. An experimental crescent-shaped magnetic gear was built. The obtained results prove the validity of the use of this structure in triple-speed coaxial magnetic gears and the high performance of it compared to other structures used in magnetic gears.

Keywords

References

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History

  • Receive Date: 12 April 2020
  • Revise Date: 18 July 2020
  • Accept Date: 18 November 2020
  • Publish Date: 21 April 2021

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