Iron Loss Calculation of Orthogonal-Core-Type Variable Inductor with Permanent Magnets by RNA

• Published in: Transaction of the Magnetics Society of Japan Special Issues Vol. 9; no. 1; pp. 60 - 65
• Main Authors: Arimatsu, K., Hatakeyama, H., Ohinata, T., Nakamura, K.
• Format: Journal Article
• Language: Japanese
• Published: The Magnetics Society of Japan 01.05.2025; 公益社団法人 日本磁気学会
• Subjects: Orthogonal-core-type variable inductor with permanent magnets; Reactive power compensator; Reluctance network analysis (RNA)
• ISSN: 2432-0471
• DOI: 10.20819/msjtmsj.25TR902

  Variable inductors, consisting of magnetic cores, primary dc windings, and secondary ac windings, can control the effective inductance of the secondary ac windings by applying a primary dc current due to the magnetic saturation effect. Therefore, they are applicable as reactive power compensators in electric power systems. In a previous study, a novel orthogonal-core-type variable inductor with permanent magnets was proposed. The proposed variable inductor can regulate the effective reactive power from leading to lagging by controlling the primary dc current from positive to negative. Consequently, line voltage can be increased or decreased without using power capacitors. In this paper, first, the iron loss characteristics of prototype orthogonal-core-type variable inductors with permanent magnets are measured. Next, the RNA model is applied to calculate both the iron loss in silicon steel sheets and the eddy current loss caused by the flux penetrating through the sheets. As a result, it is revealed that the proposed RNA model can calculate iron loss accurately.