With the rapid development of global industries such as new energy vehicles, wind power generation, and rail transit, the demand for high-performance motors and transformers is growing steadily. As a core component, the quality of insulation treatment for motor stator windings directly determines the equipment's lifespan, efficiency, and operational stability. Traditional varnish impregnation processes can no longer meet the stringent requirements of the current high-end market for "zero air gaps, high fill rates, and excellent thermal conductivity."
At the end of 2025, a leading domestic special motor manufacturing enterprise launched a production line upgrade project. The aim was to introduce an internationally advanced Vacuum Pressure Impregnation (VPI) system to replace aging equipment and enhance its core competitiveness in the field of high-end servo motors. After multiple rounds of rigorous technical reviews and on-site inspections, our company stood out from numerous competitors thanks to our exceptional system integration capabilities, mature process formulations, and comprehensive after-sales service system.
Customized Intelligent VPI Impregnation System
Addressing the customer's needs for processing large-sized stators and achieving high-precision process control, our engineering technology team tailor-made a dual-tank parallel, fully automatic VPI vacuum pressure impregnation equipment. The core highlights of this system include:
Ultra-High Vacuum and Precision Pressurization:
The equipment employs imported high-power vacuum pump groups, achieving an ultimate vacuum degree of below 5Pa. This ensures that air and moisture within the micro-pores of the windings are thoroughly extracted. The pressure tank is designed with a pressure rating of up to 0.9MPa. Coupled with high-precision proportional valves, it enables damage-free resin penetration under high pressure, increasing the fill rate to over 98%.
Intelligent Temperature Control and Resin Management:
An integrated PID intelligent temperature control system provides multi-zone heating for the impregnation tank, resin storage tank, and pipelines, controlling the temperature difference within ±1°C. This effectively prevents premature resin gelation or viscosity fluctuations. Additionally, an automatic resin stirring and filtration circulation system is equipped to ensure the insulating varnish remains in optimal working condition.
Full-Process Automated Control:
Based on Industry 4.0 standards, the PLC central control system features various built-in process recipe libraries. Operators only need to press one button to start, and the system automatically completes the entire sequence of processes: "preheating - vacuum drying - vacuum impregnation - pressure impregnation - dripping - cleaning." It also records all process parameters in real-time, ensuring full traceability of production data.
Safety and Environmental Protection Design:
The equipment operates in a fully enclosed manner and is equipped with highly efficient solvent recovery units and exhaust gas treatment interfaces. This not only guarantees safety in the workshop environment but also helps customers easily pass strict environmental protection inspections.
The successful delivery of this VPI equipment is another powerful testament to our company's technical strength in the field of insulation treatment. We deeply understand that behind every piece of equipment lies the customer's ultimate pursuit of product quality and their urgent desire to seize market opportunities.