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Energies 2015, 8(7), 7441-7464; doi:10.3390/en8077441

Characteristic Analysis and Control of a Hybrid Excitation Linear Eddy Current Brake

Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150080, China
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Author to whom correspondence should be addressed.
Academic Editor: Paul Stewart
Received: 31 March 2015 / Revised: 22 June 2015 / Accepted: 17 July 2015 / Published: 22 July 2015
(This article belongs to the Special Issue Electrical Power and Energy Systems for Transportation Applications)

Abstract

In this paper, a novel hybrid excitation linear eddy current brake is presented as a braking system for high-speed road and rail vehicles. The presence of the permanent magnets (PMs), whose flux lines in the primary core are oppositely directed with respect to the flux lines by the excitation windings, has the effect of mitigating the saturation of the iron in the teeth of the primary core. This allows the brake to be fed with more intense currents, improving the braking force. First, using the magnetic equivalent circuit method and the layer theory approach, the analytical model of the hybrid excitation linear eddy current brake was developed, which can account for the saturation effects occurring in the iron parts. The saturation effects make the design and control of eddy current brakes more difficult. Second, the relationship between the braking force characteristics and the design parameters were analyzed to provide useful information to the designers of eddy current brakes. Then, the controller of the hybrid excitation linear eddy current brake was designed to control the amplitude of the braking force. Finally, experimental measurements were conducted to verify the validity of the theoretical analysis. View Full-Text
Keywords: eddy current brake; hybrid excitation; finite element method; three-level pulse-width modulation (PWM) scheme eddy current brake; hybrid excitation; finite element method; three-level pulse-width modulation (PWM) scheme
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kou, B.; Jin, Y.; Zhang, L.; Zhang, H. Characteristic Analysis and Control of a Hybrid Excitation Linear Eddy Current Brake. Energies 2015, 8, 7441-7464.

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