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.

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.