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Principles of saturable reactor and magnetic
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100 per cent A.C. supply alternating ampere ampere-turns applied arrangement auto-excitation average rectified battery bias British Thomson-Houston capacitor coils components connected constant control ampere-turns control characteristic control circuit control m.m.f. control windings core material corresponding cycle D.C. amplifier D.C. windings depends device direct current domains drift eddy currents effect electrical electronic electronic amplifier equation even-harmonic excitation ferromagnetic flux density flux-density harmonics IcNc impedance increased inductance inductor lamination linear load current loop magnetic amplifier magnetic circuits magnetic materials magnetic modulator magnetization characteristic metal rectifiers method motor Mumetal non-linear number of turns operation output circuit output current output windings parallel-connected permeability polarizing field power gain practical pulses push-pull relay resistance saturable reactor second harmonic self-excitation series-connected shown in Fig signal sinusoidal speed spool suitable supply voltage time-constant transductor transformer transient response unit usually valves variations voltage and frequency waveform zero control current zero stability zero-drift