Vacuum Pressure Impregnation System VPI

Vacuum Pressure Impregnation System VPI

Extend the life and operation of your motor -- Choose a motor that utilizes vacuum pressure impregnation to protect and maintain void-free electrical windings.

1. What is VPI (Vacuum Pressure Impregnation)?

Vacuum Pressure Impregnation (VPI) is a process that uses vacuum and pressure to seal porous materials with varnish or resin. The process is used primarily for high-voltage motors and generators to fill gaps in materials to create a void free insulation in various devices.

Industrial electromechanical equipment is designed for durability to provide reliable function and increased longevity, but age, temperature, and environmental factors can degrade porous metals over time. The process of impregnation seals porous materials with varnish or resin, improving the function and longevity of equipment.

2. The Benefits of VPI

• Modifications or custom-assembly to meet specific need
• Properly sized Impregnator and Storage Tank lowers operating costs by reducing costly resin inventories, Chiller load requirements, Inert gas consumption, and improving cycle times
• Quality and cost control over manufacturing and assembly
• Eliminates delays, re-work, costly mistakes arising from the use of several subcontractors
• Deeper resin penetration
• Void-free insulation that minimizes corona, improves heat transfer and provides greater bond strength
• Protects against moisture, dirt and corrosive chemicals
• Results in longer life for the motor rewinds, boosting the shop's reputation for quality work

3. Technical parameters of vacuum impregnation machine

Note: above is the standard type of our VPI equipment. We can custom design to customers’ requirements.

4. General process of VPI

YICHENG specializes in vacuum pressure impregnation equipment manufacturing, which is more effective than traditional dip-and-bake methods and is better suited to high voltage motors and generators. Our basic vacuum pressure impregnation motor repair process comprises several steps.

• Pre-heating:Workpieces are placed in an oven and get heating up to allow  moisture to evaporate. This helps the resin better penetrate the material.
• Dry Vacuuming: Workpieces are removed from the oven and place it into a vacuum chamber, which removes air and any remaining moisture.
• Filling: The impregnation chamber is filled with resin, coating the part and filling in all the gaps and pores in workpiece.
• Wet Vacuuming: Vacuum levels are reduced and hold it for a set period of time.
• Pressure: Increase pressure within the chamber using air compressor. This allows for even deeper penetration of the resin.
• Draining: Vent the pressure, drain the chamber of excess resin, and remove the workpiece.
• Curing: Finally, the equipment is placed into an oven to cure the resin.

5. Application of VPI

VPI systems are used by the electrical industry in the processing of coil windings, transformer components, power cables, fiberglass laminations, cores, paper products and other items.

Impregnation has been in commercial use for over 60 years and continues to be the preferred method for ensuring pressure tight components in fail safe applications.  The aerospace, automotive, food processing and oil and gas industry use vacuum impregnation to improve the quality of their base castings, conserve resources and reduce scrap.

• Motors & motor coils
• Dynamo/alternators
• Transformers
• Pumps
• Fans
• Household appliances
• Rotors
• Stator coils

6. Machine pictures

7. Company profile

Welcome to Yicheng!Yicheng Machinery is located in Zhangjiagang City, which is around 2 hours drive from Shanghai Pudong International Airport. We are a leading supplier of Vacuum (Pressure) Impregnation and Drying equipment, with more than 10 years experience in this field.

We have successfully built over 350 turn key projects all over the world, which make us one of the biggest manufacturers and the most powerful factories for vacuum impregnation machinery.

We have already sold our machines to over 25 countries, like: Russia, USA, Saudi, Egypt, Malaysia, Brazil, Guatemala, Vietnam, Kazakhstan, Uzbekistan, Chile, and etc. 

We sincerely hope to establish trustworthy and long-term relationships with clients all over the world to develop and move forward hand in hand together!

Business in 25 countries worldwide