Transformer for connecting a threephase system to a two-phase system

Claim 1

A TRANSFORMER HAVING TWO MAGNETIC CIRCUITS NINETY DEGREES OUT OF PHASE PROVIDING UNIFORM FLUX DENSITY, SAID TRANSFORMER COMPRISING A MAGNETIC CORE INCLUDING A PLURALITY OF STACKED LAYERS OF LAMINATIONS FORMED FROM MAGNETIC STRIP MATERIAL HAVING AT LEAST ONE PREFERRED DIRECTION OF MAGNETIC ORIENTATION SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL DIMENSION OF SAID STRIP MATERIAL, EACH OF SAID LAYERS INCLUDING FIRST AND SECOND OUTER LEG LAMINATIONS WHICH FORM FIRST AND SECOND OUTER LEG PORTIONS WHEN STACKED, AN INTERMEDIATE LEG LAMINATION AND YOKE LAMINATIONS CONNECTING THE ENDS OF SAID LEG LAMINATIONS ASSEMBLED AROUND TWO SUUSTANTIALLY RECTANGULAR WINDOWS, THE JOINTS BETWEEN THE LEG AND YOKE LAMINATIONS OF EACH LAYER BEING DIAGONAL BUT JOINTS WITH RESPECT TO THE LONGITUDINAL DIMENSION OF THE STRIP MATERIAL FROM WHICH THE LAMINATIONS ARE FORMED, THE CORRESPONDING JOINTS IN ALTERNATE LAYERS BEING OFFSET FROM ONE ANOTHER TO PROVIDE AN AREA OF OVERLAP BETWEEN THE RESPECTIVE JOINTS, THE WIDTH OF THE INTERMEDIATE LEG LAMINATION IN EACH LAYER BEING SUBSTANTIALLY 1.4 TIMES THE WIDTH OF EACH OUTER LEG LAMINATION IN SAID LAYER AND FIRST AND SECOND WINDINGS DISPOSED ON EACH OF THE FIRST AND SECOND OUTER LEG PORTIONS ONLY, RESPECTIVELY, ONE END OF THE FIRST WINDING ON ONE OUTER LEG PORTION BEING CONNECTED SUBSTANTIALLY TO THE MID-POINT OF THE FIRST WINDING ON THE OTHER OUTER LEG PORTION.