This paper proposes a new frequency modulator using a ferrite orthogonal core and its application to thyrystor parallel inverter.The expressions for the output oscillation frequency and for the relation between primary and secondary flux are derived.A new thrystor parallel inverter has many excellent characteristics as speed control device of induction motor, which include simplicity of circuit construction, good isolation between gate circuit and thyrystor main circuit, wide variable frequency range and noise absorption characteristics.
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