GB621800A - Improvements in iron cores for induction meters - Google Patents

Abstract

621,800. Supply meters. LANDIS & GYR SOC. ANON. May 31, 1946, No. 16653. Convention date, June 2, 1945. [Class 37] An iron core with divided flux path for induction meters is provided with at least one air gap 1 in the iron, for the passage of one portion of the driving flux, and one or more uninterrupted iron paths 4 bridging this air gap for the other portion, the cross-section of the iron path being not more than 40 per cent of the combined cross-sections of the iron path and the air gap. As shown in Fig. 1, the path 4 and gap 1 are formed over the same cross-section of the iron. If desired, the air gap 5 may be formed between two separate cross-section faces 6 and 7 of the iron (see Fig. 2), an iron member 8, which may be arched or flat, serving as the path. In a laminated core, the outermost plates may form the iron member. Modifications are described in which pole pieces are used as iron members. A pole piece 18, Fig. 7, has an inverted step 19 which bears on the face 20 of a limb 21 of the core, whereby an air gap 22 is formed. The step may be formed on the limb, either at the end or in the middle, or it may be constituted by a spacing member between the pole piece and the face of the limb, which are both flat. The spacing member lies over a slot in the face of the limb, in which slot is a plate supported in grooves in the slot walls, a screw passing through both pole piece and spacing member and screwing into the plate in the slot.