GB190114562A - Improvements in Alternating Current Electricity Meters. - Google Patents

Abstract

14,562. Catenhusen, F. L. July 17. Energy meters.-A motor meter for a single alternating current has a conductive disc c revolved by the co-operation of a horse-shoe shunt electromagnet b with a main current coil d, which has no iron core and is placed at some distance from the spindle. The electromagnet b has two equal coils i, i<1>, connected in series between the mains, and such that the iron is not magnetized so high as the bend in its magnetization curve. The main current coil d consists of a few large turns, and is separated by a conductive plate from a coaxial fine wire coil g. The coil g is connected in series with a non-conductive resistance between the mains, and the point of connection between the coil g and the resistance is joined by a second resistance to the connection between the coils i, i<1>. The arrangement is such that the coil g co-operates with the magnet b to produce a resultant magnetic field in quadrature with the field due to the main current coil d, when the load is non-inductive. One of the two resistances may be inductive, and that in series with the coil g may consist partly of aoother coil acting on the disc. Two or more sets of coils may be provided to act on one disc, as described in Specification No. 14,614. A.D. 1898. A metal piece o serves to neutralize the effect of inequality of the windings i, i<1>. The invention is based on that described in Specification No. 18,789, A.D. 1900. The main objects are to obtain a large constant brake effect from the electromagnet b, and a long range of proportionality between the main current and the velocity of the disc.