Patent ID: 8390414

Claim:
A transformer system for converting 3 phase AC power to 9 phase AC power, the transformer comprising: a laminated core comprising integral first, second and third poles; first, second and third coils constructed on the first, second and third poles of the laminated core, respectively, wherein each coil includes: a plurality of windings; a plurality of cooling ducts, wherein at least one of the plurality of cooling ducts is disposed between one of the poles of the laminated core and an adjacent winding of the respective coil, and wherein a first portion of a first winding in the plurality of windings and a second portion of the first winding are positioned adjacent to at least one different cooling duct of the plurality of cooling ducts; first, second and third input terminals linked to the first, second and third coils, and configured to receive first, second and third phases of input AC power; and first through ninth output terminals communicatively linked to first through ninth output power lines.