Transformer for low distortion rectifier system
AssigneeWestinghouse Electric Corp.
InventorsJoachim E. Wolf, Paul H. Watson, Raymond J. Radus
Life of this patent
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Abstract
A coil for a 12-pulse transformer-rectifier apparatus assembled on a three-leg magnetic core comprising a half primary winding sandwiched between two half secondary windings of substantially the same height as the half primary winding. A pair of coils associated with one leg of a three-leg magnetic core in a 12-pulse transformer-rectifier, are oriented in opposition to one another, and have all their terminal conductors extending parallel to one another with transversal connectors in closely-related parallel planes.
Claims15
In a 12-pulse transformer/rectifier apparatus for converting three-phase AC to DC, from a three-phase primary through a twelve-phase hexagonally distributed secondary, the combination of :
- two half primary winding associated across the opposite side of the hexagon to respective secondary windings, to form six primary-secondary coils,
- each of said coils including two half secondary windings of same height as said half primary winding having a common point at one end, having a start and a finish lead at the opposite end, said half-primary winding being sandwiched between said two half secondary windings;
- said coils being distributed by pairs on three legs of a magnetic core so that the coils of one pair belong to opposite sides of the hexagon and are oriented in opposition on the same leg, but symmetrically in relation to the central leg of the magnetic core.
In an hexagon transformer including three primary windings and six secondary windings equally distributed on a planar three-leg magnetic core, the combination of:
- each of said primary windings having two half-windings associated with opposite sides of the hexagon, respectively;
- each of said secondary windings being relative to one corresponding side of the hexagon and including two half secondary windings;
- one half primary winding being sandwiched between two half secondary windings of the same hexagon side;
- six identical coils each formed of one half primary winding and two half secondary windings, said coils being so electrically connected that they are adjacent along the hexagon by the same polarity, and said coils being mounted by pairs so that the coil of one hexagon side being mounted on a common magnetic core leg with a similar coil for the opposite hexagon side.
In a transformer having a primary winding and a secondary winding mounted on a magnetic core, the combination of:
- said secondary winding including two substantially identical secondary coils in series about a common junction point, one secondary coil being disposed inside said primary winding and the other secondary coil being disposed outside said primary winding, with respective terminal conductors at one end, said common junction point being at the other end of said two secondary coils, said two secondary coils being coiled in opposite directions to one another.
Dependencies are inferred from the claim text.