Abstract
To enhance braking force and control convenience of high-speed railway systems, this paper proposes a new electromagnetic track brake, and the corresponding design, optimization, and experimental test are implemented. The proposed track brake is longitudinal-axis magnetic circuits excited by multiple coils electromagnets, and the pole shoes are extending outward. A preliminary design of an electromagnetic track brake is developed, including iron core height, iron core width, iron core gap, excitation ampere-turn, coil arrangement form, coil thickness, and preliminary height of single-layer coil. The electromagnet number and pole shoe gap are optimized through three-dimensional electromagnetic simulation comparisons. The final design of the electromagnetic track brake is determined, including iron core length, copper wire diameter, coil turn, and final height of single-layer coil. Experimental verification of electromagnetic attractive force is performed through prototype tests, and the newly developed electromagnetic track brake can enhance electromagnetic braking deceleration by 39%.
Highlights
Since the high-speed rail system Shinkansen was first launched in 1964, such rail systems have developed rapidly in Japan, Germany, France, and China [1, 2]. e current maximum speed of high-speed trains reportedly reached 574.8 km/h [3]
Magnet track brakes can be categorized into permanent-magnet track brake and electromagnetic track brake (ETB), classified by the excitation mode [7]
Optimization of ETB. e electromagnet number and the pole shoe gap are optimized in this part to improve the electromagnetic attractive force (EAF) between ETB and track by using Ansoft Maxwell
Summary
Since the high-speed rail system Shinkansen was first launched in 1964, such rail systems have developed rapidly in Japan, Germany, France, and China [1, 2]. e current maximum speed of high-speed trains reportedly reached 574.8 km/h [3]. When the electromagnet number equals n, there are (n + 1) branch magnetic circuits of the longitudinal beam bak (1 ≤ κ ≤ n + 1), n branch magnetic circuits of the iron cores bck (1 ≤ κ ≤ n), two branch magnetic circuits of the protection blocks bpk (1 ≤ κ ≤ 2), n branch magnetic circuits of the excitation coils bek (1 ≤ κ ≤ n), n branch magnetic circuits of the air gaps between pole shoes and track bmgk (1 ≤ κ ≤ n), two branch magnetic circuits of the air gaps between protection blocks and track bpgk (1 ≤ κ ≤ 2), (n + 1) branch magnetic circuits of track btk (1 ≤ κ ≤ n + 1), and (n + 1) loop magnetic circuits ik (1 ≤ κ ≤ n + 1). The adjacent iron core gap laic is 50 mm, and the gap between the protection block and the adjacent iron core lpic is 25 mm
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