Spray Booth for Motor Painting &
Electric Motor Paint Booth – Autocoat Engineering
Autocoat Engineering has vast experience in electric motor and induction motor pretreatment and painting — designing different motor spray booths depending on the frame size and weight, with a proven 4-stage painting process for motor castings. India’s leading motor paint booth manufacturer since 1985, based in Thane, Maharashtra.
About Electric Motors & Induction Motor Painting
An induction motor (electric motor) is a generally used AC electric motor. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction from the rotating magnetic field of the stator winding. The rotor of an induction motor can be a squirrel cage rotor or wound type rotor.
Autocoat Engineering has vast experience in the field of pretreatment for electric motors and induction motor painting. Most important is the process flow while developing any painting line for motors or any casting products — once the process is properly set, quality improvement can easily be achieved.
The specification for motor painting covers surface preparation and application of protective coating on motors. Paints used have excellent resistance to various chemicals. The specification defines which surfaces require protective coating and which surfaces are to remain unpainted.
Surfaces That Do Not Require Coating
The following surfaces will not require protective coating in the motor paint booth:
Motor Painting Process – 4 Stages
Autocoat’s complete motor painting process covers four distinct stages — from initial pretreatment through to final finish colour coating:
Pre-Treatment of Motor Casting
Surface cleaning of the casting is carried out as soon as the castings are checked and passed for further process. A minimum of a 7-tank process or 10-tank process is necessary for the pretreatment of motor castings.
Once a phosphate coat is applied, the motor casting is transferred to the motor paint booth. This process can also be carried out by the Shot Blasting Method. Once the phosphate coat is applied, primer painting of the motor must be done within the shortest possible time — to avoid oxidation of the motor castings.
Induction Motor Painting — Primer Coat on Jigs
Motor castings are placed over a jig or a pattern of jigs so that multiple castings can be painted with primer or red oxide in the motor paint booth.
With jigs in use and the right spray booth, the desired paint film thickness in microns is achieved. The paint booth removes undesired overspray from the painting area — making a smooth finish over the motor casting. Primer painting gives corrosion resistance and allows other visual defects to be monitored before the final coat is applied.
Mid Primer Coat & Surface Cleaning After Assembly
During the assembly of the motors, each motor passes through many component assembly areas and testing zones. During this process, oil and grease marks get onto the casting. These marks must be removed thoroughly with cleaners.
A mid primer coat is then applied in the motor spray booth for additional coat building and surface preparation. This stage ensures the casting surface is thoroughly clean and primed before the final finish colour coat is applied.
Final Finish Colour Coat
After the above stage, the assembled motors are finally painted using two methods depending on frame size and weight:
Conveyorised Electric Motor Painting Method — for smaller frame sizes 83 to 132. Motors are dried on a conveyor for motor painting — fast, economical and consistent for high-volume production. Autocoat has designed, developed and manufactured conveyor motor painting lines running almost on a 3-shift basis, trouble-free.
Paint Booth for Electric Motors with Monorail Handling Equipment — for large frame sizes above 132 and HT motors. This method enhances the capability of the painter to lift and lower the heavy motors and also to rotate them for all-around coverage.
Autocoat conducts training sessions to educate painters and subordinates for maximum productivity and effective maintenance of motor spray booths. Every booth is manufactured, assembled, numbered, tested and live trials are given at the customer’s facility. Detailed instruction manuals, SOP laminations and TPM activity guidance are included with every unit.
Two Methods of Motor Painting
Autocoat supplies motor painting solutions for both small frame conveyorised production and large/heavy motor batch painting with monorail handling:
Conveyorised vs Monorail – Comparison
| Feature | Conveyorised Motor Painting | Monorail Handling Paint Booth |
|---|---|---|
| Best For | Frame sizes 83 to 132 | Frame sizes 132+ & HT motors |
| Production Volume | High — 3-shift basis | Medium — batch process |
| Material Handling | Conveyor line | Double monorail & hoist |
| Motor Rotation | Fixed position on jig | Yes — lift, lower & rotate |
| All-Round Coverage | Conveyor jigs | Full 360° with double monorail |
| Operator Effort | Low — automated movement | Assisted by hoist |
| Pollution Compliance | Yes | Yes |
| Running Speed | Fast & economical | Flexible per component |
Motor Spray Booth – Key Features
Pretreatment Expertise
Vast experience in 7-tank and 10-tank phosphating pretreatment processes for motor castings, or shot blasting — ensuring the casting is oil-free, rust-free and ready for painting.
Jig-Based Painting System
Single or multi-motor jig setups inside the motor paint booth ensure the correct paint film thickness in microns on every casting — with overspray removal for a smooth, consistent finish.
Double Monorail Handling for Heavy Motors
Double monorail and hoist handling equipment developed by Autocoat enables the painter to lift, lower and rotate heavy motors — enhancing painting capability and all-around coverage for large frame and HT motors.
Conveyorised Lines for High Volume
Autocoat has designed, developed and manufactured conveyorised motor painting lines for frame sizes 83 to 132, running on a 3-shift basis trouble-free — fast and economical for high-volume motor production.
Pollution Board Norm Compliance
Autocoat motor spray booths are very efficient and match pollution board norms — ensuring overspray is fully captured and the workshop environment remains safe and compliant.
Painter Training Sessions
Training sessions are conducted by Autocoat to educate painters and subordinates for maximum productivity and effective maintenance — ensuring best results throughout the motor spray booth’s working life.
Spray Booth for Motor Painting – Applications
Autocoat Spray Booths for Motor Painting and Motor Paint Booths serve the following applications: