An integrated flywheel energy storage system with homopolar inductor motor/generator and high-frequency drive
Perry Tsao; Senesky, M.; Sanders, S.R.
Industry Applications, IEEE Transactions on
Volume 39, Issue 6, Nov.-Dec. 2003 Page(s): 1710 - 1725
Digital Object Identifier   10.1109/TIA.2003.818992
Summary: The design, construction, and test of an integrated flywheel energy storage system with a homopolar inductor motor/generator and high-frequency drive is presented in this paper. The work is presented as an integrated design of flywheel system, motor, drive, and controller. The motor design features low rotor losses, a slotless stator, construction from robust and low cost materials, and a rotor that also serves as the energy storage rotor for the flywheel system. A high-frequency six-step drive scheme is used in place of pulsewidth modulation because of the high electrical frequencies. A speed-sensorless controller that works without state estimation is also described. A prototype of the flywheel system has been demonstrated at a power level of 9.4 kW, with an average system efficiency of 83% over a 30000-60000 r/min speed range.

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