Ceramic cores for power resistor elements

Ceramic cores are integral components in power resistor elements, particularly in wirewound and edgewound resistors. These cores are primarily made from steatite and cordierite, materials chosen for their exceptional thermal and electrical properties.

Steatite, a form of magnesium silicate, is prized for its excellent electrical insulation and mechanical strength. This makes it ideal for applications where maintaining integrity under electrical load is crucial. Cordierite, known for its outstanding thermal shock resistance and low thermal expansion, ensures that the ceramic cores can endure extreme temperature variations without cracking or losing structural integrity.

In wirewound resistors, a metal wire is wound around a ceramic core, providing precise resistance values and stability under high power conditions. Similarly, edgewound resistors utilize a flat wire wound around the ceramic core, offering enhanced surface area for better heat dissipation and efficiency.

The combination of steatite and cordierite in ceramic cores enhances the performance and durability of these power resistors, making them suitable for demanding industrial and commercial applications.