新絶縁付与潤滑剤を用いたネットシェイプリアクトルコア

抄録

This products are pure iron Soft Magnetic Composite (SMC) reactor cores for voltage boosting and rectification inside of inverter of photovoltaic system.

The hardness of pure iron SMC itself is soft, so in compaction process, pure iron powders tend to plastic flow and destroy insulation films. Then, the original characteristics are unavailable because of the drastic increase in eddy current loss. So, we developed new lubricant for SMC which can prevent from plastic flow at the sliding surface as well as improving the insulation properties.

One of lubricant elements slides between metal powders and dies, protecting the metal particle shapes and preventing from plastic flow. Whereas, one of insulation elements combines with insulation films preferentially and improves insulation properties of sliding surface.

Not only is the specific resistivity of sliding surface and compression surface equivalent, the core loss is maintained low. Finally, with developed lubricant, we achieved the net-shape manufacturing of reactor core without surface finishing and restriction of assembling directions.