Repair / Overhaul

The repair and overhaul of rotating electrical machines is a specialist job. Elma Services performs repair and overhaul jobs for a variety of companies working with driving equipment. Preventive maintenance is also one of our many activities. The works are executed in our workshop or on site, for example on ships and offshore applications.

We have an up-to-date and well-maintained machine park:

• Metalworking with lathes and milling machines. Dynamic balancing of rotors, axles, fans and pumps ranging up to 2000 kg
• Equipment for MIG and TIG welding
• Rewinding department with automatic coil winders, coil retraction machines, impregnation tanks and a drying and burn out oven.
• Test bench for load tests for generators and motors up to 150 kW. DC to 600V / 200A and AC 120/208/230/400/460 V both 50 and 60 Hz.

The steps a standard repair and overhaul contract of a damaged generator follows due overheating:

Step 1: An entry inspection and a report with recommendations.

Step 2: The generator is placed in the burn-out oven, where the insulation and binder yarns are burned.

Step 3: the coils are pulled out of the stator, the generator is cleaned and rebuilt.

Step 4: the slots are provided with insulation and the new coils are replaced.

Step 5: the insulation and the auxiliary windings are placed.

Step 6: the windings and the wiring is connected in the terminal box.

Step 7: the insulating layer is disposed in the immersion bench and the generator enters into the drying oven. This process is repeated a number of times.

Step 8: the generator is assembled again and installed on the test bench.

Step 9: After approval the quality controller releases the documents.