Theory of magnetic amplifiers with square-loop core materials

The purpose of this paper is to explain the operation of magnetic amplifiers and to express power out, power gain, and time constant of the amplifier in terms of core and rectifier properties. The magnetic amplifiers under discussion are of the so-called low-control circuit-impedance type.1 To reduce the complexity of the analysis, many simplifying assumptions are made. While these assumptions introduce inaccuracies in the equations, the latter still serve effectively in establishing first-order relations among the variables. A large part of the analysis is applicable to core materials whose dynamic hysteresis (B-H) loop is not strictly rectangular, such as grain-oriented silicon steel.