HT & LT Motor Rewinding and Repair
Rewinding, repair and overhaul of high-tension and low-tension induction and synchronous motors up to 11 kV and 10 MW, at our works in Ranchi, Jharkhand.
- Up to 11 kV
- Up to 10 MW
- Induction & synchronous
- Since 1978Ranchi, Jharkhand
- 45+ yearsof experience
- 10,000+equipment repaired
- ISO 9001:2015certified
- 65,000 sq ftworks area
What we do
- Complete stator rewinding of HT and LT motors, induction and synchronous
- HT stator coils and Roebel coils made in our own coil shop
- VPI & resin-rich insulation processes
- Rotor repairs and dynamic balancing up to 3 Tonnes
- Machining on our 24 ft centre lathe and TIG welding
- Complete testing before dispatch
How the work is done
Typical steps for a motor rewinding job at our works.
- 01
Inspection
Visual inspection and electrical tests on arrival to find the fault.
- 02
Dismantling
Stator, rotor and bearings are opened up and checked.
- 03
Rewinding
New coils — made in our coil shop for HT machines — are fitted and connected.
- 04
Impregnation & drying
Winding insulation is impregnated and cured in our drying oven (40–200 °C).
- 05
Balancing & assembly
The rotor is dynamically balanced where needed and the motor is reassembled.
- 06
Final testing
Surge comparison, high-voltage and insulation tests before dispatch.
Facilities used
Equipment at our 65,000 sq ft works in Ranchi used for this work.
| Equipment | Capacity / make |
|---|---|
| 2 × hydraulic coil moulding machines | Eight cylinders, 9 Tonnes each, 0–200 °C |
| Coil spreading machine | For forming HT coils |
| Drying oven | 40–200 °C · 3000 × 2500 × 1500 mm |
| Dynamic balancing machine | 600 / 1500 RPM · 3 Tonnes · Ø1600 × 3000 mm |
| Overhead cranes | 4 nos · up to 30 Tonnes |
| Surge comparison tester | Jabbals, 10 kV |
| High voltage test kit | RE, 100 kV AC / 70 kV DC |
Industries served: Power plants, steel plants, coal mines, aluminium smelters, cement, fertiliser and railways — including NTPC, SAIL, Tata Steel, Coal India subsidiaries, Hindalco and NALCO.
Questions about motor rewinding
What size of motor can you rewind?
HT and LT induction and synchronous motors up to 11 kV and 10 MW.
Do you make the HT coils yourselves?
Yes. HT stator coils (up to 11 kV) and Roebel coils are made in our own coil shop in Ranchi, on two hydraulic coil moulding machines and a coil spreading machine.
Which tests are done after rewinding?
Surge comparison testing (Jabbals, 10 kV), high-voltage testing (up to 100 kV AC / 70 kV DC) and tan delta & capacitance measurement (up to 12 kV), plus dynamic balancing of the rotor where needed.
Can you inspect a motor at our plant first?
Yes. Our field team carries out on-site diagnostics and commissioning in Jharkhand and eastern India.
Need motor rewinding work?
Send us the equipment rating, make and the fault you see — we will get back to you with a plan and a quote.