In-slot injection molding technology, which injects molten plastic into a mold to fix the coil, enhance insulation, and improve slot fill factor, is one way to achieve in-slot oil cooling. United Power's in-slot injection molding uses high-performance engineering plastics with a CTI value ≥600V, a thermal conductivity of 2.0W/m・K, and a thickness of 0.15mm, which can improve slot fill factor by 7%. Schaeffler's stator slot injection molding solution uses a polymer formed by integral injection molding instead of slot insulation paper. Sumitomo Bakelite's slot injection molding technology uses a thermosetting molding plastic encapsulation process.
Foamed insulation paper technology uses heat to expand and fill gaps and adhere to the core and coil, solving the problems of insulation and oil cooling pipeline blockage in high-voltage platforms. Hausen has developed insulation paper foaming molding technology. Ligo's Baigong® foamed insulation paper uses a self-developed high-durability adhesive that can expand and fill gaps at high temperatures.
