Numerical Modelling and Experimental Testing of Eddy-Current Dampers
C. Chen(1), A. Bissal(1), E. Salinas(2)
(1) KTH Royal Institute of Technology, Stockholm, Sweden
(2) ABB Corporate Research, Västerås, Sweden
A contact system driven by a high energetic Thomson actuator requires to be decelerated from full speed down to zero. The forces originated from the interaction between a stationary copper tube and a moving array of magnets combined with plastic separators or ferromagnetic material are used to generate eddy-current damping. Five different configurations of small but strong neodymium magnets and spacers were benchmarked for simple free-fall damping. A comparison between experimental results and simulations (using COMSOL) shows that the most effective damping is reached by two consecutive permanent magnets with opposite magnetization
directions, separated by low-carbon content steel concentrators. The proposed damper design is the result of the balance between various parameters such as magnet orientation topology in the array, spacer material and its dimensions, copper tube thickness and the air gap between copper tube and array. Furthermore, the design was scaled up and an actuator-drive system was added to perform more realistic tests, which demonstrated the damping effectiveness on a fast moving armature actuated by a Thomson coil energized by a capacitor bank. The results of these tests validated the numerical model with a good degree of accuracy.
ACTUATOR 2014 Manuscript B1.6
Publication date: 08/04/2015
Manuscript B1.6 published in Conference Proceedings ACTUATOR 2014
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