Novel actuator for magnetic suspensions of flywheel batteries
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Magnetically suspended high speed, energy storage flywheels are presently being developed for terrestrial, satellite, and International Space Station applications. A key component in the magnetic suspension is the actuator that applies control forces to the spinning rotor in response to electric currents. The actuator is typically selected using three criteria: efficiency, size (weight), and fault tolerance. This paper examines the relationship between a bearing's geometric dimensions and its performance. Specifically it examines a magnetic bearing biased with permanent magnet poles. In this paper a method is presented for choosing the dimensions of the rotor, stator, and coils. The method generates families of curves relating bias flux density to the maximum bearing force, power loss in each coil, coil inductance, peak current, number of coils, permanent magnet length, and the bearing outer radius. With the curves the bearing with the highest force and lowest power loss, that still has reasonable inductance, and size can be found.
author list (cited authors)
Kenny, A., Provenza, A., Na, U. J., Palazzolo, A., Beach, R., Kascak, A., ... Lei, S.