A theory of the series transductor

The theory of the series transductor with natural excitation is discussed and general equations for load and control current are derived. The effect of phase shift between the supply voltage and that across the transductor is taken into account, and the transient changes which occur at the moment of transductor cut-off are explained. The effect on the transductor characteristic of the shape of the B/H curve for the core material is considered, and the analysis is extended to enable an experimental B/H curve to be used in the derivation of the transductor characteristic. It is shown that, with 100% self-excitation, the transductor characteristic approximates in shape to the upper part of the B/H curve.