Three-dimensional electromagnetic analysis and design of permanent magnet retarder

doi:10.1007/s11465-010-0111-0

Front Mech Eng Chin

2010, Vol. 5

Issue (4) : 438-441 https://doi.org/10.1007/s11465-010-0111-0

RESEARCH ARTICLE

Three-dimensional electromagnetic analysis and design of permanent magnet retarder

Lezhi YE(

), Desheng LI, Bingfeng JIAO

Mechanical & Electronic Technology Research Center, Beijing University of Technology, Beijing 100124, China

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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

Corresponding Author(s): YE Lezhi,Email:yelezhi@emails.bjut.edu.cn

Issue Date: 05 December 2010

Cite this article:

Bingfeng JIAO,Lezhi YE,Desheng LI. Three-dimensional electromagnetic analysis and design of permanent magnet retarder[J]. Front Mech Eng Chin, 2010, 5(4): 438-441.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-010-0111-0
https://academic.hep.com.cn/fme/EN/Y2010/V5/I4/438

Fig.1 Structure of air-cooling PMR

Fig.2 Structure of water-cooling PMR

Fig.3 Permanent magnet retarder analysis model

Tab.1 PMR size parameters

Fig.4 Stator eddy currents distribution at 3000 r/min (unit 10 A/m)

Fig.5 Flux density distribution on stator (unit T)

Fig.6 PMR test system

Fig.7 Permanent magnet retarder photos

Fig.8 Flux densities in air gap

Fig.9 Braking torque curve

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