MULTIPHASE TRANSFORMER WITH CIRCULAR WINDINGS ON DIFFERENT SPIRAL CORES Russian patent published in 2007 - IPC H01F30/14 H02M5/14 

FIELD: electrical engineering; multiphase semiconductor converters such as inverters, rectifiers, and other semiconductor devices.

SUBSTANCE: proposed multiphase transformer has intermediate laminated core and two lateral spiral cores abutting against butt-ends of intermediate laminated core through nonmagnetic spacers. Intermediate laminated core is made of stacks of two different cold-rolled electric steel sections with slots in butt-end, inner, and side surfaces accommodating three-phase winding enclosing intermediate laminated core yoke. Central part of intermediate laminated core has slots at outer and inner surfaces of laminated core. Lateral spiral cores abutting against intermediate laminated core have slots in side surface abutting against intermediate laminated core accommodating two circular windings with taps, each enclosing respective lateral spiral core.

EFFECT: enhanced electromagnetic compatibility, reduced power loss, enhanced efficiency.

1 cl, 4 dwg