Basic Characteristics of Lap-Winding type Three-Phase Laminated-Core Variable Inductor

摘要

??Variable inductors, which are composed of only a magnetic core and primary dc and secondary ac windings, can control the effective inductance of the secondary ac winding linearly and continuously by primary dc current due to the magnetic saturation effect. The variable inductors have simple and robust structures, and are highly reliable. Therefore, they are suitable for application as Var compensators in electric power systems. We previously proposed a three-phase laminated-core variable inductor specialized for electric power systems. It had only one laminated-core in which the three-phase secondary ac windings were installed together, in order to reduce the size and weight in comparison with conventional single-phase variable inductors. We propose here a lap-winding type three-phase laminated-core variable inductor that achieves further reduction in size and weight. Basic characteristics of the proposed variable inductor were calculated using finite element method (FEM) and reluctance network analysis (RNA).