What we do
Coral embodies a new dimension in the rewinding and re-engineering business. With the courage to go the extra mile, Coral has become known as a reliable and trusted partner for servicing and renovating rotating electrical machines for leading domestic and international businesses.
Coral began operations in 1979 in the Erode district of Tamil Nadu, India. Starting as a small workshop servicing fractional kilowatt motors, it has grown into one of India’s top rewinders, meeting global market demands. From fractional kilowatts to over 600 MW, we serve a wide range of customers, offering fast and reliable services with a dedicated team and advanced testing facilities. Our quality meets global standards and is cost-effective and time-efficient, providing the best solutions for manufacturing and rewinding needs.
Coral serves critical power-generating sectors (hydro, turbo, nuclear, wind) and productive sectors (textile, ferrous, non-ferrous industries, chemicals, sugar, paper, petrochemicals, railways, mines and other major industries). Our services include high-voltage generator rewinding, motor repairs, reconditioning, modernisation and upgrades, among others.
Quality
Rewinding,
Every Time
Why Coral Rewinding?
People & Infrastructure
Coral Rewinding India Pvt Ltd is an ISO 9001:2015 certified company with a 275-strong workforce. They specialise in repairing and refurbishing AC/DC machines, offering on-site and offsite services with 24×7 emergency support. Additionally, they are an authorised service provider for top motor manufacturers.
Hi-Speed Balancing Machine
The Hi-Speed Balancing Machine provides accurate testing at actual speeds. The largest machine can handle up to 30 tons at 3000 RPM and 70 tonnes at 500 RPM.
VPI Impregnation
Coral has three VPI chambers, with the largest capable of handling 800 MW. They ensure safer cold room storage and high-grade insulation, avoiding derating, higher temperature, decreased efficiency and failures.
Testing
Coral maintains strict in-house quality standards, surpassing International/National ones for achieving zero defects. They store quality check results in a computerised data bank for control and future reference.
Technical Superiority & Quality
Coral maintains a strong quality management system with rigorous control checks at every repair stage. Their “Quality Assurance Plan” ensures adherence to standard procedures, resulting in efficient, stable and durable finished products.
RET (Reverse Engineering Techniques)
RET generates detailed manufacturing drawings from final equipment, especially useful when working without complete specs or retrofitting old/damaged machines. The process accommodates the constraints of older machines while incorporating modern techniques and materials to meet customer requirements.
Total Cumulative Energy Served
13,500 MW
Key Infrastructure Highlights
VPI Tank
5m dia. x 12m length
Balancing
Up to 30 tonnes
Handling
Cranes with 210-tonne capacity
Automatic Core Varnishing Machine
Brazing Machine for salient poles
Testing
No-load trials up to 5 MW / 11KV
Routine in-house tests aligned with OEM standards
Pole Manufacturing: Salient poles with core and coil production
Insulation Storage: Climate-controlled at <5°C for material integrity
State-of-the-Art Rewinding & High-Speed Balancing
Precision balancing for industrial excellence – our advanced systems are designed for high accuracy, across varying load ranges.
Balancing Specs
- Max Capacity: 30 tonnes
- Bed Length: 6 meters
- Low-Speed: 300 RPM
- Mid-Speed (3–15 tonnes): 700 RPM
- High-Speed (≤3 tonnes): 1500 RPM
Special Handling Expertise
- Dual Rotor Wheel Balancing: Balancing two armatures on a single shaft.
- Rotor Pole Handling: Up to 3.1m in length, 6.2 tonnes weight and 250 MW capacity.
- Expertise meets precision for even the most challenging rotor setups.
Advanced Infrastructure & Logistics
Built for performance. Powered by capability.
- Simultaneous Handling: Simultaneously we can handle 8 machines on the shop floor.
- Integrated Facilities: In-house machine shop, rotor balancing, coil brazing, lathes – ensuring speed and quality.
- Skilled Manpower: Parallel project execution without compromise.
Mega Watt Served
| Type of Machine | Cooling System | MW Served |
|---|---|---|
| Turbo Generator | Direct water/Hydrogen cooled machines | 3345 MW |
| Turbo Generator | Air cooled machines | 3843 MW |
| Motors | Air cooled machines | 86 MW |
| Hydro Generator | Air cooled machines | 4908 MW |
| Wind Generator | Air cooled machines | 1318 MW |
Machines Handled
| Type of Machine | Inhouse | On site work |
|---|---|---|
| Turbo Generator | 29 | 22 |
| Motors | 2 | 0 |
| Hydro Generator | 13 | 92 |
| Wind Generator | 741 | 66 |
24/7 Nationwide Support
When downtime isn’t an option our dedicated fault-attending team is ready for deployment anywhere in India, anytime.
Trust with our
Certificates
We are backed by more than 9+ industry standards, including ISO, WRAS and FDA.
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