รับออกแบบและสร้างเครื่อง VPI ยี่ห้อ MESC อาบน้ำยาขดลวดมอเตอร์ระบบสุญญากาศและแรงดัน

Showcase: Large VPI System, U-Services (Thailand), Saraburi Branch

Large MESC VPI system for big motors and generators. Installed in a pit at the customer's plant, with hydraulic lid opening and locking.

A repeat customer across branches: U-Services (Thailand) works with MTP-Thai at its Saraburi branch (VPI system) and Surat Thani branch (3-ton balancing machine calibration).

From Fabrication to Delivery

Every MESC VPI tank is built in our own workshop, with every weld and the pressure test checked by an external lab before painting and delivery.

Project Photos

VPI System Details

Example Specifications (Delivered Units)

MESC VPI (Vacuum Pressure Impregnation) systems are designed and built by MTP-Thai engineers in Thailand. VPI uses vacuum and pressure to push varnish or resin deep into motor, generator and transformer windings. This helps resin penetrate the winding thoroughly and gives more uniform impregnation than dipping or pouring. Every system is made to order, sized to your largest workpiece and your budget.

Key Features

• Vacuum Impregnation: removes air and moisture from the windings before resin filling, reducing trapped air.
• Pressure Impregnation: pressure helps drive resin into slots and insulation layers.
• Controlled Resin System: insulated resin storage tank with mixer and chiller controls resin temperature, and extra resin returns for the next cycle.
• Motor and Generator Ready: stators, rotors, transformer coils and general rewinding work.
• Industrial Design: designed for controlled VPI processing. Every tank is pressure tested before delivery.

System Components

• VPI Tank: sized to your largest workpiece. Hydraulic lid with Slide Lock or Nut Lock type.
• Resin Storage Tank: insulated stainless steel tank with mixer.
• Vacuum Pump: pulls the tank down to the design vacuum level.
• Chiller: resin temperature control.
• Air Dryer: supplies dry air for pressurizing, so no moisture enters the tank.
• Control Panel and Gauges: Manual or Automatic, to match your budget.

7-Step VPI Process

1. Pre-Baking: bake the workpiece to remove moisture.
2. Dry Vacuum: pull vacuum to remove trapped air and moisture.
3. Resin Filling: fill resin from the storage tank under vacuum until the workpiece is covered.
4. Pressure Impregnation: apply pressure so resin penetrates the winding.
5. Resin Return and Draining: return extra resin to the storage tank and let the workpiece drain.
6. Curing: cure in an oven following the resin specification.
7. Final Inspection: visual check and electrical tests such as Insulation Resistance and Surge Test.

Applications

• Motor repair and rewinding shops
• Generator and transformer makers and repairers
• Power plants, shipyards and naval dockyards
• Factories that repair their own motors in-house

Manual or Automatic

Manual: the operator controls each valve and step. Lower starting price. Good for shops that run VPI from time to time.

Automatic: the system runs each step by program, time and set values. Fewer manual steps. Good for daily production.

MESC VPI Installations

Advance Industrial Service Co., Ltd. (Thailand): 2 VPI systems installed. Tank Dia. 1,500 mm with Slide Lock lid, and tank Dia. 1,800 mm with Nut Lock lid, with stainless resin storage tank, mixer, chiller and control panel.

Naval Dockyard, Royal Thai Navy: 2 VPI systems. System 1, tank Dia. 1,500 mm, completed and ready for delivery. System 2, tank Dia. 1,800 mm, now starting.

Pressure Tested Before Delivery

Every tank passes a hydrostatic pressure test before delivery. The customer receives the real test report with the machine. The images below show a sample report format.

Cycle and process parameters are set to suit the resin, insulation system and workpiece of each customer.

VPI vs Dipping

Dipping or pouring coats the outside well, but air stays trapped in deep gaps, so resin cannot fill them. VPI removes the air first, then applies pressure, so resin replaces the air everywhere. It is the right choice for high voltage motors, large motors and machines that cannot afford downtime.

Information We Need for Design

• Size and weight of your largest workpiece
• Workpiece type, such as stator, rotor or transformer coil
• Approximate jobs per month and resin type
• Control type you want, and budget
• Installation space and power supply at your plant

Frequently Asked Questions

What is VPI?

VPI stands for Vacuum Pressure Impregnation. Air is removed from the winding first, then resin is filled and pressurized so it penetrates the winding thoroughly. The winding is then cured in an oven.

Is there a standard VPI tank size?

No. We design the system around the size and weight of your largest workpiece. Examples of our work include tanks of Dia. 1,500 mm and 1,800 mm.

How much does a VPI system cost?

The price depends on tank size, Manual or Automatic control, and the equipment you need. Send us your workpiece size and requirements, and our team will propose a design and quotation.

What can be treated with VPI?

Windings of electric motors, generators, transformers and other coils, for both new production and rewinding repair.

How should windings be tested after VPI?

Measure insulation resistance and test turn-to-turn insulation with a Surge Tester before delivery. Assembled rotors should also be checked on a balancing machine.

Do I also need a curing oven?

Yes. After impregnation, the resin must be cured in an oven according to the resin specification. Our team can advise on the right oven size for your work.

Serving Customers Across Asia

We welcome VPI projects from Thailand and across Asia. Send us your largest workpiece size and weight, resin type, monthly volume, control type and budget. Our engineers will propose the right tank size and system for you.

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