3503 リアクトルコアの磁場と構造の連成解析による最適防振設計(OS3-8 設計と最適化VIII)

Abstract

This paper proposes optimal vibration-proof design of reactor core based on coupled analysis of magnetics and harmonic response. A reactor is a part of the in-vehicle DC-DC converter to boost the electric voltage, and it is composed of cores, coils, and so on. Because of electromagnetic and harmonic response characteristics of the reactor, the reactor core vibrates when the reactor core is in use, and as a result, noises are generated. To reduce these noises, a topology optimization method for reactor core design is proposed in this paper. Here, the main difficulty is to compute the electromagnetic force appropriately. Roughly speaking, standard topology optimization methods, such as density based methods, are not suitable to compute the electromagnetic force because grayscale elements smear out the structural boundary in which the electromagnetic force is imposed. Therefore, in this paper, boundary tracking type level-set based topology optimization is used where grayscale elements can be suppressed completely. Thanks to this grayscale-free topology optimization, the coupled analysis of magnetics and harmonic response is successfully performed, and as a result, topology optimization of the reactor core for reducing the noises is realized. The usefulness of the proposed method is confirmed using some numerical examples.