Development of Mold-Core Type Gapped Iron-Core Reactor using Adhesive Coated Electromagnetic Sheet

The adhesive coated non-oriented electromagnetic steel sheet is well known to be effective in realizing high efficiency, high power motors with compact size and low noise. The authors developed newly adhesive coated grain oriented electromagnetic steel sheets. Then, a gapped iron-core type reactor having a new iron-core structure is developed using the adhesive coated steel sheets. By adopting the adhesive coated grain oriented electromagnetic steel sheets to the leg of the reactor, the fastening studs of the laminated electromagnetic steel sheets, which are required in conventional reactor, and the through hole for the fastening studs could be omitted. This enabled us to simplify the structure and reduce the core diameter. On the other hand, we examined the magnetic flux distributions and local loss distributions in the yoke by the detailed magnetic field analysis to utilize the grain oriented electromagnetic steel sheet with bolt-less construction, and realized the reduction of dimensions and weights due to the increase of magnetic flux density. The reactor developed has such features of smaller size, lighter weight and lower noise level.