Metal working – Method of mechanical manufacture – Electrical device making
Patent
1977-01-21
1978-03-28
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
336165, 336178, 336212, H01F 4102
Patent
active
040807258
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. 1 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: 2456457 (1948-12-01), Somerville
patent: 2460656 (1949-02-01), Sliwiak
patent: 2523071 (1950-09-01), Somerville
patent: 2567717 (1951-09-01), Lagerlof
patent: 2639355 (1953-05-01), Dunsheath
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
Hall Carl E.
Thomas & Skinner, Inc.
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