Three-dimensional electromagnetic analysis and design of permanent magnet retarder

Abstract

An eddy current retarder for vehicles generates much heat when it works continuously, which leads to serious decline in braking torque. This paper proposes a novel permanent magnet retarder (PMR) for vehicles, whose cooling system connects with engine cooling-water. A three-dimensional finite element model is developed to model the electromagnetic behavior of a permanent magnet retarder under a constant speed. The magnetic field and eddy current field in PMR are numerically solved by a finite element method. By accounting for the nonlinear permeability of the rotor and the weakened effect in the magnetic field that is generated by the eddy current magnetic field, the calculation accuracy of air-gap magnetic field is enhanced. Experiment shows that the temperature of the retarder is less than 150°C, and the braking torque keeps the hard characteristics curve. The calculated air-gap magnetic flux density is fairly good agreement with the measured one.

Keywords

auxiliary brake / permanent magnet retarder / water-cooling / finite element method

References

[1] Ye L Z, Li D S. Study on a novel permanent magnet retarder for vehicles. In: Progress in Electromagnetics Research Symposium, Hangzhou, 2008, 531-535

[2] Hu Q X, He R. Working principle and usage of vehicle-used permanent-magnet type retarder design. Computation Research, 2005, (3): 22-25

[3] Zhu N, Wang Y H. Light type permanent magnet retarder for vehicle. Bus Technology and Research, 2002, 24(4): l9-20

[4] He R. Auxiliary Braking Equipment for Vehicle. Beijing: Chemical Industry Press, 2005 (in Chinese)

[5] Wang B L. Electromagnetism and Electro-Instrument Design Base. Beijing: National Defense Industry Press, 1989 (in Chinese)

[6] Takahashi N, Natsumeda M, Muramatsu K, Yamada C, Ogawa M, Kobayashi S, Kuwahara T. Optimization of permanent magnet type of retarder using 3D finite element method and direct search method. IEEE Transactions on Magnetics, 1998, 34(5): 2996-2999

[7] Bigeon J, Sabonnadi`ere J C, Coulomb J. Finite element analysis of an electromagnetic brake. IEEE Transactions on Magnetics, 1983, 19(6): 2632-2634

Acknowledgements

This work was supported by the Beijing Major Scientific and Technological Achievements Project (D090004048209001) and Beijing University of Technology Doctorial Innovation Foundation (bcx-2009-001).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg