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Numerical modelling and experimental testing of eddy-current dampers
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2014 (English)In: ACTUATOR14, Bremen: MESSE BREMEN , 2014Conference paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
Bremen: MESSE BREMEN , 2014.
Keyword [en]
Damping, Thomson actuator, eddy currents, magnets, ferromagnetic materials, magnetic flux concentrators
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-156528OAI: diva2:766977
ACTUATOR 2014, Bremen, Germany, 23 – 25 June 2014

QC 20141208

Available from: 2014-11-28 Created: 2014-11-28 Last updated: 2014-12-08Bibliographically approved

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