Inductor devices – Inductive regulators with no relatively moving parts – With magnetic shunt to increase leakage reactance
Patent
1977-02-25
1978-03-28
Kozma, Thomas J.
Inductor devices
Inductive regulators with no relatively moving parts
With magnetic shunt to increase leakage reactance
29609, H01F 2724
Patent
active
040817776
ABSTRACT:
A constant voltage transformer or other ferromagnetic device in which operating characteristics depend on the effective length of the air gap in a shunt forming part of the magnetic core structure. Different effective air gaps are obtained, using identically the same core lamination sets (which may be in a low-scrap pattern) by (a) forming shunt laminations of a length to provide a maximum air gap length and with a longitudinally offset rivet hole, offset by slightly less than half the maximum air gap length, (b) stacking the shunt laminations on a rivet in a stacking pattern in which the long ends of some laminations are oriented inward and the long ends of others oriented outward so as to produce a shunt stack with the laminations in a staggered relationship, and (c) varying the stacking pattern to thereby vary the proportion of outward to inward-oriented laminations. The stacking pattern, e.g., 1 out .times. in; 1 out .times. 2 in; 2 out .times. 5 in; 1 out .times. 3 in; 1 out .times. 4 in; etc., may be selected by the designer from predetermined data to give effective air gaps in small steps over a wide range of values, from about 20 percent to 100 percent of the maximum air gap.
Use of the same identical lamination sets to obtain different air gaps greatly reduces lamination tooling costs and inventory sizes. The staggered shunt stacks also provide load-responsive regulation of the transformer.
REFERENCES:
patent: 1606755 (1926-11-01), Field
patent: 2460656 (1949-02-01), Sliwiak
patent: 2567717 (1951-09-01), Lagerlof
patent: 2639355 (1953-05-01), Dunsheaty
patent: 2934727 (1960-04-01), Cornell
patent: 2996656 (1961-08-01), Sola
patent: 3112439 (1963-11-01), Rosin
patent: 3456223 (1969-07-01), Smith
patent: 3546571 (1970-12-01), Fletcher et al.
patent: 3693127 (1972-09-01), Smith
Kozma Thomas J.
Thomas & Skinner, Inc.
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