We are also trying to make strides in a new field in addition to electric insulation materials. ~ Development of a semiconductive sheet ~
- Business solutions
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Background
The composition elements of electric equipment include a conductor that can conduct electricity, an insulation that cannot conduct electricity, and a semiconductor that has electrical resistance intermediate between former two elements. Electric equipment may obtain the best performance by using these elements within a certain balance.
Okabe Mica had long-standing proven results as a manufacturer of electric insulation, but entered a new field to improve the characteristics of customers’ products. -
Challenges
Because a generator has a large potential difference inside, any failures (voids) may cause various electrical discharges, resulting in insulation degradation. Eliminating such defects and suppressing the potential differences will contribute to extending the life of the generator and improving its reliability.
Internal structure of the generator’s coils
Customer
Mica products have excellent electrical insulation, however, to produce a better generator, relying on only electrical insulation materials with excellent dielectric strength is not enough.
Conventional Roebel transposition stuffing may easily cause failures (voids) and carry the risk of easily causing damage (electrical tree) due to electrical discharge.
Providing semiconductivity to this part may improve coil performance. -
Solutions
We developed a sheet with semiconductivity instead of using conventional Roebel transposition stuffing. Additionally, in order to easily fill the gaps of the Roebel transposition part of the generator coils, we made a semi-cured adhesive to improve fluidity.
Newly-developed product: Semiconductive sheet
Mica products have excellent electrical "insulation" properties, but to build a better generator, it is not enough to have electrical "insulation" materials with excellent dielectric strength alone.
Followability to the Roebel transposition part
Because of its semi-cured product character, an adhesive may flow and follow even in the Roebel transposition part that has uneven narrow gaps after heat pressing.
Conclusion
Taking advantage of our advanced know-how of electrical insulators, we succeeded in developing semiconductive products, a new field. We achieved a successful outcome by cultivating our creativity day by day to create new benefit-oriented value.