To facilitate the development of more compact homopolar generators (HPGs), the compact HPG systems tester was designed and built to develop the system and component technology necessary to design HPGs having energy densities of up to 60 MJ/m 3 • The systems tester is one-half of a full-scale counter-rotating HPG storing 2.5 MJ at 6,900 rpm and generating 20 V. Incorporated in the tester are two new types of components, face brushes and a stationary-shaft hydrostatic bearing, which will lead to HPG designs that will rotate a larger fraction of of the magnetic circuit while eliminating much of the stationary support structure. The systems tester is designed to provide a facility for future bearing research and development of the highercurrent-density brushgear required for drawing larger currents from the smaller slip ring areas of more compact machines.

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An application requirement is addressed that does not allow a conventional external vband to be used . An internal v-band design was done which satisfies the performance requirements . This report describes that design and the results of the analysis. The desired result of this analysis is to verify that the v-band will not fail under the applied load, the v-band is not self-locking and therefore fail to release when desired, the required expansion force is not greater than a specified limit, and that the natural vibration modes and frequencies do not present any anticipated problems (such as resonance and/or mode coupling) in the application . A successful design is illustrated using the output from a Finite Element Analysis . A sensitivity analysis indicates the importance and interrelationships between several key design parameters, a result that tends to agree with many years of v-band design experience at Sandia National Laboratories.

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