Patent ID: 7719858

Claim:
An autotransformer for converting three-phase AC power to fifteen-phase AC power comprising: a. three coils each containing serial windings and non-serial windings; b. said serial windings and non-serial windings totaling at least nine in number; c. said serial windings and non-serial windings being magnetically coupled; d. said serial windings and non-serial windings on said three coils being interconnected to form a multi-sided polygon; e. said multiple-sided polygon having multiple nodes to which connections can be made; f. said multiple nodes including symmetrically disposed nodes; g. said symmetrically disposed nodes providing points for applying three-phase AC input voltage and extracting AC output voltages of predetermined amplitude and phase; h. wherein predetermined AC output voltages may be less than greater than or equal to that of the three-phase AC input voltage.