POLYPHASE TRANSFORMER AND METHOD FOR ITS ASSEMBLY Russian patent published in 2013 - IPC H01F30/14 H01F41/02 

FIELD: electrical engineering.

SUBSTANCE: transformer contains polyphase primary and secondary windings and laminated magnet core consisting of inner and outer magnet cores. The inner magnet core is made of stamped round sheets of electrical steel with identical grooves open from outside but having two different outer diameters - big and small, and these grooves are alternated in axial direction in the core stack. In groves of the core stack there are coils of the primary and secondary windings. Outer magnet core is made of circular sheets consisting of two and more parts of two sizes with identical outside diameter and different inner diameter. Inner diameter of one circle is equal to outer diameter of a big sheet in the inner magnet core. Inner diameter of the second circle is equal to outer diameter of a small sheet in the inner magnet core. During assembly into the stack circular sheets with different inner diameter of the outer magnet core as well as sheets of the inner magnet core are alternated and can be interfaced with sheets the inner magnet core of respective size.

EFFECT: increase of efficiency factor and power factor, simplification of assembly.

2 cl, 9 dwg