We are pleased to submit our proposal for the motor rewinding and repair of your Gardner Denver Screw Air Compressor.
The motor is a critical component in ensuring the reliable operation of your compressor. Over time, wear, overheating, and electrical faults can cause insulation breakdown or coil damage, requiring professional rewinding to restore original performance and efficiency.

A. Initial Inspection & Testing

• Record motor nameplate data (kW, HP, voltage, RPM, insulation class, frame size)

• Perform insulation resistance test (megger test)

• Check winding resistance balance

• Inspect rotor, stator, and bearing housing for wear or damage

• Identify root cause of motor failure (if possible)

B. Rewinding Process

1. Dismantling: Carefully dismantle the motor and remove the rotor.

2. Burnout: Use temperature-controlled burnout oven to remove damaged winding without harming the core.

3. Core Cleaning & Inspection: Clean stator slots and inspect for lamination damage.

4. Rewinding:

   • Use high-grade copper wire (Class H or F insulation as per original spec)

   • Insert new coils with proper insulation sleeves and slot liners

   • Apply high-temperature varnish impregnation (VPI process if available)

5. Baking: Bake the stator in an oven to cure the varnish, ensuring insulation strength.

C. Bearing Replacement & Assembly

• Replace bearings with high-quality, sealed, heavy-duty bearings

• Check shaft alignment and end-play tolerance

• Assemble motor with proper torque settings

D. Final Testing & Commissioning

• Test winding resistance and insulation resistance after rewinding

• Conduct no-load test for vibration, noise, and current balance

• Prepare and submit final test report

 Deliverables

• Fully rewound and tested motor

• Test results (before and after)

• Failure analysis report (if applicable)

• Warranty on rewinding workmanship: [ 6 months]