1. An AC to AC frequency converter comprising:
(a) a transformer having a set of three-phase primary input terminals and n sets of three-phase secondary output terminals,
where n is three or more, with the voltages of each set of secondary output terminals being one or more multiples of 360°/n
out of phase with the voltages on the other sets of output terminals; and
(b) three single pole, n throw switches, the three output poles of the three switches electrically connected to three output
terminals of the frequency converter, the n throws of each switch connected to one of the secondary output terminals in each
set of secondary output terminals such that the switches can be switched to selectively connect each of the secondary output
terminals to the three output poles of the switches.
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