Analysis of Operating Characteristics of EIE-Core Variable Inductor Based on Three-Dimensional Magnetic Circuit

摘要

Since an EIE-core variable inductor is constructed from cores and windings, it has good features for an electric power apparatus, such as simple construction and high reliability. The variable inductor does not need any gaps for harmonic current reduction and has a suitable structure for a larger capacity. For optimum design, a quantitative analysis method for the variable inductor is important. In a previous paper, we derived a two-dimensional nonlinear magnetic circuit model of the EIE-core and found operating characteristics of the variable inductor. Although the calculation value and actual measurement showed good coincidence, in the large domain of the control current, a tendency was shown to expand quantitive error, and further improvement in calculation accuracy became a subject. In this paper, we present a three-dimensional magnetic circuit to improve analysis accuracy, and compared calculated results with actual measurements.