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The ways to reduce rotor loss of a permanent magnet (PM) motor with 200kW/9000r/min for flywheel energy storage system (FESS) is discussed in this paper. Several methods are proposed to reduce the rotor loss by optimizing the structure of rotor. The air friction loss on the surface of rotor can be decreased rapidly when pressure in the sleeve is very small. So the rotor mostly works in a vacuum in...
This paper presents the magnetic suspension test results of a bearingless motor/generator for flywheel energy storage systems. A prototype bearingless motor/generator is built on the basis of the computed results by Finite Element Method (FEM). It is an outer rotor-type permanent magnet (PM) synchronous motor/generator and the rotor is wrapped by the flywheel (CFRP). Thus, the motor/generator, the...
A 50 kWh/1 MW class flywheel energy storage system has been developed. The system has a steel flywheel, a thrust bearing using a superconducting coil and iron cores, and active magnetic bearings for stabilization in the radial direction. FEM analysis of electromagnetic characteristics of the thrust bearing was performed for studying rotational losses caused by eddy currents induced in the rotor core...
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