We suggest the superconducting rotary transformer, which is constructed from a synchronous motor combined with a generator. Compared with a usual static transformer, this one has collateral features of (1) improving the power factor, (2) obstructing the harmonic current, (3) avoiding the sudden stoppage power. Therefore it can operate not only as a transformer but also as a filter and a phase modifier on the condition by using superconducting rotary machine.
In this paper, we made a magnet type miniature model with coreless winding of conductor to examine the fundamental characteristics. Though this model had a problem of instability to changing of load, the experimental results provide a confirmation of three characteristics described above.
When the superconducting rotary machines will be practical, this transformer become possible to operate as multifunction power apparatus.
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