Modelling and Test of an Integrated Magnetic Spring-Eddy Current Damper for Space Applications

Abstract

We present the design, manufacturing, and dynamical characterization of a mechanical suspension made by a passive magnetic spring and an eddy current damper integrated into a single device. Three configurations with 2, 3, and 4 permanent magnets axially distributed with opposite polarizations are designed, simulated, manufactured, and tested. Stiffness of 2410, 2050, 2090 N/m and damping coefficient of 5.45, 10.52 and 17.25 Ns/m are measured for the 2-, 3-, and 4-magnets configurations, respectively. The magnetic suspension provides good mechanical properties combined with excellent cleanness and high reliability, which is very desirable in mechanical systems for space applications.

Experimental Study of Different materials on Electromagnetic Damping CharacteristicsExperimental Study of Different Materials on Electromagnetic Damping Characteristics

“…Various research and development were related to electromagnetic damping [1], [3], [11], [17], [18]. Eddy currents are one case of electromagnetic induction.…”

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“…Se ha demostrado que la transferencia de energía inalámbrica es viable para dispositivos MEMS de 1mm 3 . En el caso de los inductores, como componente básico de motores y actuadores lineales, se busca que sean capaces de generar la mayor densidad de campo magnético posible por potencia consumida [24]- [26]. Esto hace que los motores con bobinas multicapa, con la posibilidad de incluir un núcleo de hierro que mejora sus características, tengan mejor despeño que los motores de bobinas planas.…”

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“…Permanent magnets made of NdFeB and SmCo can reach high magnetic products, high remanence and high coercitivity. Theses magnets are used in plenty of industrial applications: electric machines [1], mechanical damping [2] [3], braking [4] or contactless transmission [5] systems. In MEMS (Micro-ElectroMechanical Systems) [6][7][8] and micromachines [9][10][11][12], high quality magnets of NdFeB and SmCo in micrometric size are required.…”