Abstract
For active magnetically suspended rotors in mobile flywheel energy storage systems the lowest possible weight, smallest size and a low price is required. Since the flywheel is operated in vacuum and very little heat can be dissipated from the rotor, the bearing’s magnetic losses have to be as minimal as well. This paper compares the design and optimization of homopolar radial active magnetic bearings with 3 different types of laminated steel. The first type is a standard transformer steel, the second one is high flux cobalt steel and the third one is high flux cobalt steel with high tensile strength.
Highlights
In order to achieve highest possible energy densities, the flywheel is constructed from materials with high tensile strength and low weight
This paper is presenting the optimization of homopolar active magnetic bearings
The optima are fundamentally based on the magnetization curve of the desired magnetic material
Summary
In order to achieve highest possible energy densities, the flywheel is constructed from materials with high tensile strength and low weight. This leads to high rotational speeds and requires magnetic bearings and operation in vacuum [1]. This paper is presenting the optimization of homopolar active magnetic bearings. Ding et al [3] present a finite element method (FEM) based optimization. To find a weight dependent optimum for different kinds of laminated steel, it is necessary to compare a lot of optimization results. We decided to build up an equivalent magnetic circuit model to compute the mean flux density and the magnetic force to obtain the cost function
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