Abstract
A variable inductor, which consists of only a magnetic core and primary dc and secondary ac windings, can regulate the secondary winding inductance continuously by dc excitation from the primary winding. The variable inductor is expected to be applied to reactive power compensation in electric power systems, because it has a simple and robust structure that is extremely reliable. In a previous paper, a three-phase-laminated-core variable inductor was proposed, which has three-phase secondary ac windings installed in one laminated core to reduce the size and weight in comparison with those of a single-phase variable inductor. This paper presents an experimental verification of the proposed three-phase-laminated-core variable inductor at various ac voltages. The copper and iron losses and the efficiency of the variable inductor are also shown.
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