Axial ampere-turn balancing in multiple, segregated secondary winding transformers

Claim 2

An electrical transformer comprising, in combination: a. a magnetic core having a core leg; b. a primary winding wound on said core leg; c. a first and second secondary winding wound on said core leg contiguous with said primary winding; said first and second secondary windings being axially separated from one another and wound on axially separated portions of said core leg; d. a tertiary winding wound on said core leg; said tertiary winding having first and second axially separated winding portions respectively contiguous with said first and second secondary windings; said first and second tertiary winding portions connected to one another in parallel.

Claim 3

The transformer of claim 1 wherein said second winding portion of said tertiary winding is wound in a reverse direction from the winding direction of said first winding portion of said tertiary winding.

Claim 4

The transformer of claim 2 wherein one end of said first winding portion of said tertiary winding is connected to ground; said tertiary winding being disposed between said primary and secondary windings.

Claim 5

The transformer of claim 1 wherein one end of said primary winding is at line potential, and wherein one end of said first tertiary winding is connected to ground; said one end of said primary winding and said one end of said tertiary winding are adjacent one another.

Claim 6

The transformer of claim 1 wherein said primary winding consists of first and second axially separated portions which are respectively coextensive with said first and second secondary windings in the direction of their principal leakage flux.

Claim 7

A multiphase electrical transformer comprising, in combination: a. a magnetic core having a plurality of core legs; b. a plurality of primary windings, each wound on a respective one of said core legs and connected together in a predetermined circuit relation; c. a first and second plurality of secondary windings, at least one winding of each of said first and second pluralities of secondary windings wound on a respective one of said core legs with a respective one of said primary windings; each of said first and second plurality of secondary windings on each of said core legs respectively connected to one another in a predetermined circuit relation; said first plurality of secondary windings being each axially separated from said second plurality of secondary windings and being wound on axially separated portions of said core leg; d. a first and second plurality of tertiary windings, at least one winding of each of said first and second pluralities of tertiary windings wound on a respective one of said core legs and being concentric with a respective winding of said first and second plurality of secondary windings, respectively; each of said tertiary windings of said first and second plurality of tertiary windings being axially separated on their respective core leg; each of said tertiary windings on each of said core legs being connected to one another in parallel.

Claim 8

A multiphase electrical transformer comprising, in combination: a. a magnetic core having a plurality of core legs; b. a plurality of primary windings, each wound on a respective one of said core legs and connected together in a predetermined circuit relation; c. a first and second plurality of secondary windings, at least one winding of each of said first and second pluralities of secondary windings wound on a respective one of said core legs with a respective one of said primary windings; each of said first and second plurality of secondary windings on each of said core legs respectively connected to one another in a predetermined circuit relation; said first plurality of secondary windings being each axially separated from said second plurality of secondary windings and being wound on axially separated portions of said core leg; d. a first and second plurality of tertiary windings, at least one winding of each of said first and second pluralities of tertiary windings wound on a respective one of said core legs and being concentric with a respective winding of said first and second plurality of secondary windings, respectively; each of said tertiary windings of said first and second plurality of tertiary windings being axially separated on their respective core leg; each of said tertiary windings on each of said core legs being connected to one another in parallel.

Claim 9

The transformer of claim 6 wherein said second plurality of tertiary windings are wound in a reverse direction with respect to said first plurality of tertiary windings.

Claim 10

The transformer of claim 6 wherein said primary windings are connected in delta and wherein said first and second plurality of secondary wiNdings are connected in wye and delta, respectively.

Claim 11

The transformer of claim 6 wherein one end of said primary winding is at line potential, and wherein one end of said first tertiary winding is connected to ground; said one end of said primary winding and said one end of said tertiary winding are adjacent one another.

Claim 12

A multiphase rectifier system comprising, in combination: a first and second bridge-connected rectifier and a multiphase rectifier transformer; said multiphase electrical transformer comprising, in combination: a. a magnetic core having a plurality of core legs; b. a plurality of primary windings, each wound on a respective one of said core legs and connected together in a predetermined circuit relation; c. a first and second plurality of secondary windings, one winding of each of said first and second pluralities of secondary windings wound on a respective one of said core legs with a respective one of said primary windings; each of said first and second plurality of secondary windings respectively connected to one another in a predetermined circuit relation; said first plurality of secondary windings being each axially separated from said second plurality of secondary windings and being wound on axially separated portions of said core leg; d. a first and second plurality of tertiary windings, at least one winding of each of said first and second pluralities of tertiary windings wound on a respective one of said core legs and each being concentric with a respective winding of said first and second plurality of secondary windings, respectively; each of said tertiary windings of said first and second plurality of tertiary windings being axially separated on their respective core leg; each of said tertiary windings on each of said core legs being connected to one another in parallel.

Claim 13

A multiphase rectifier system comprising, in combination: a first and second bridge-connected rectifier and a multiphase rectifier transformer; said multiphase electrical transformer comprising, in combination: a. a magnetic core having a plurality of core legs; b. a plurality of primary windings, each wound on a respective one of said core legs and connected together in a predetermined circuit relation; c. a first and second plurality of secondary windings, one winding of each of said first and second pluralities of secondary windings wound on a respective one of said core legs with a respective one of said primary windings; each of said first and second plurality of secondary windings respectively connected to one another in a predetermined circuit relation; said first plurality of secondary windings being each axially separated from said second plurality of secondary windings and being wound on axially separated portions of said core leg; d. a first and second plurality of tertiary windings, at least one winding of each of said first and second pluralities of tertiary windings wound on a respective one of said core legs and each being concentric with a respective winding of said first and second plurality of secondary windings, respectively; each of said tertiary windings of said first and second plurality of tertiary windings being axially separated on their respective core leg; each of said tertiary windings on each of said core legs being connected to one another in parallel.

Claim 14

The rectifier system of claim 10 wherein said first plurality of secondary windings are connected in wye, and wherein said second plurality of secondary windings are connected in delta.

Claim 15

The rectifier system of claim 10 wherein at least one of said first plurality of tertiary windings is provided with accessible terminal means adapted for connection to a load.

Claim 16

The electrical transformer of claim 1 wherein said tertiary winding has terminal means extending therefrom for connection to external loads which are energizable independently of said first and second secondary windings.