Flux controlled shunt regulated transformer

• US 4,177,418 A
• Filed: 08/04/1977
• Issued: 12/04/1979
• Est. Priority Date: 08/04/1977
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Farel, Charles A., Brueckner, Karl H., Irsik, Johnnie F.
• Primary Examiner(s): Pellinen, A. D.
• Application Number:
  US05/821,893
• Time in Patent Office: 852 Days
• Field of Search: 323/6, 323/44 R, 323/56, 323/48, 323/89 C, 336/155, 336/160, 336/212, 336/214, 336/215
• US Class Current: 323/250
• CPC Class Codes: H01F 2029/143 with control winding for generating magnetic bias
• CPC Class Codes: H01F 29/14 with variable magnetic bias amplitude modulation by means of variable impedance element H03C1/08 ; magnetic amplifiers H03F; circuits for automatic telephonic communication H04M3/00
• CPC Class Codes: Y10S 174/17 in an electric power conversion, regulation, or protection system
• CPC Class Codes: Y10S 174/25 Transformer

Abstract

The output voltage of a transformer is regulated by controlling the flow of magnetic flux through a shunt core. The transformer includes a main core fabricated from U-I laminations and is arranged to form a substantially rectangular structure. A primary and a secondary coil are seated on the main core. A shunt core with shunt winding having lamination size and structure substantially analogous to that of the main core is positioned in spaced alignment to said main core. A flux interconnecting path, called the bottleneck, connects the main core and the shunt core to form a sturdy unified structure. The shunt winding is activated by control circuitry by which the flux flow through the shunt core is limited and hence the output voltage is regulated.

Claims

1. A regulating transformer comprising in combination:

a main "O" shaped core for supporting primary and secondary coils;

a shunt "O" shaped core for supporting at least one control coil;

said shunt core being positioned in spaced juxtaposed alignment with the main core;

separate flux interconnecting means placed such that the magnetic flux from the main core travels at right angles to said flux interconnecting means for interconnecting the main core and the shunt core;

said flux interconnecting means including a plurality of stacked I-shaped laminations placed such that the magnetic flux from the main core travels at right angles to the plurality of laminations and also being operable to mechanically couple the main and shunt cores;

fastening means, interconnecting the cores and flux interconnecting means, operable to give structural strength to said transformer; and

mounting means operable for mounting said transformer.

2. The transformer as claimed in claim 1 further including circuit control means connected to said shunt core coil;

said circuit control means being operable to limit magnetic flux flow in the shunt core.

3. The device as claimed in claim 1 wherein the flux interconnecting means includes ferrite bars.

4. Structure for a shunt controlled voltage regulating transformer comprising in combination;

a rectangular shaped main core having primary and secondary coil thereon;

said main core having the central portion being removed;

first electrical conductors being operably connected to said primary coil;

second electrical conductors being operably connected to the secondary coil;

connecting core means with a surface area less than the surface area of the main core and being connected to the main core for leaking magnetic flux away from the main core, said connecting core means including a plurality of stacked I-shaped laminations placed such that the magnetic flux from the main core travels at right angles to the plurality of laminations;

a shunt core having a geometry substantially equivalent to the geometry of the main core;

said shunt core being connected to the connecting core means and controlling the flow of magnetic flux in the main core;

control coil being seated on said shunt core; and

electrical conductors being connected to said control coil.

5. Magnetic structure for a transformer comprising in combination:

a main squared O-shaped core for supporting primary and secondary coils;

a shunt squared "O" shaped core being positioned in spaced juxtaposed alignment with said main core for supporting at least one control coil;

bottleneck means being operable to interconnect the main core and shunt core such that the magnetic flux from the main core travels at right angles to said bottleneck means and including a plurality of stacked I-shaped laminations placed such that the magnetic flux from the main core travels at right angles to the plurality of laminations;

said bottleneck means being operable for controlling magnetic flux and for structurally supporting said transformer.

6. The device as claimed in claim 5 where the cores and bottleneck means are fabricated from material having high magnetic permeance.

7. Tne device as claimed in claim 5 where the bottleneck means is fabricated from ferrite material.

8. The device as claimed in claim 5 where the bottleneck means is fabricated from a magnetic material with high resistivity.