• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.4B no.2
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• pp.59-64
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• 2004

Study of an accurate and robust braking control method is required as a technical improvement to the servo system. In particular, the braker exhibiting constant braking performance under speed variation conditions of the prime mover needs to be investigated. In this paper, the braking torque of the eddy current braker between the electromagnet stator and rotating disk is analyzed. The torque-speed characteristics and accurate disk construction are represented. From the computer simulation results, it was found that eddy current braking torque is linear or approximately constant over the desired speed range depending on the rotor material, disk construction, pole number and pole displacement of the stator. These relations are confirmed by experimental results.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.51 no.12
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• pp.659-663
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• 2002

The brake systems of high-speed train are to be equipped with three different brake systems, such as regenerative brake with regenerative feedback in driving car, a pneumatic disc brake, and non-contact linear eddy-current brake(ECB). The regenerative brake and the pneumatic disc brake are acting on the wheels. Their achievable braking force depends on the adhesive coefficient, which is influenced by the weather condition and speed, between the wheel and The linear eddy current brake gets an economical solution in the high-speed train because of the independence of the adhesive coefficient, no maintenance needed. and the good control characteristics. The braking force and the normal force of ECB for korean high-speed train are analysed by the 2D FEM(Finite Element Method). Finally the normal force is compared with the experiential values to verify the analysis.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.5
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• pp.197-202
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• 2003

When a high-speed train reduces its operating velocity while decelerating from a maximum of 350 to 50 [km/h], the train applies eddy-current brakes, which results in a deceleration time of approximately 3minutes. Therefore, a high current is utilized in order to obtain a large braking force. Consequently, the temperature of the electromagnet and rail increases significantly. In this paper, The thermal characteristics on a single magnet pole with convection heat transfer coefficient are simulated by using 2D-FEM. To verify the analysis results, the computed temperatures are compared with the experimentally measured temperature at stationary state. Furthermore, transient-state thermal analysis is performed to predict the magnet temperatures as the train is decelerating.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.855-857
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• 2000

Brake system using eddy current is adequate to obtain safe braking force in high speed transportation system and electric vehicle etc. In this paper, we propose the new type eddy current braker using Halbach array. which compared with the conventional permanent magnet array. The airgap flux density of Halbach array is higher 25% then conventional array, therefor we can predict that braking force is much large 1.56 times then conventional array.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.906-908
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• 2002

The technical improvement of servo system, it is required to study on robust control method in company. It needs to study on brake system that has constant torque-speed performance as load variation. In this paper, braking torque characteristics of eddy current braker between electromagnet stator and rotating disk are analyzed. The torque-speed characteristics and proper disk construction are presented. From the computer simulation results, it was found that eddy current braking torque is linear or approximately constant over the desired speed range depending on the rotor material, disk construction, pole number and pole displacement of stator. The relationship of these parameters are confirmed by experimental result.