Repair of submersible motors

Repair of asynchronous motors for submersible, drainage and sewage pumps

Ecoforce Ltd repairs special asynchronous motor driven pumps:

• installed in drilling wells with 6" to 14" diameter (submersible pumps);
• used for drainage of construction sites and undergroundwater (drainage pumps);
• used for transportation of waste, sewage and heavily polluted waters (sewage pumps);

Special feature of submersible asynchronous motors is that they normally work or are allowed to operate fully submerged in the pumped water.

Depending on the design, they are divided into two types:

• submersible motors - "wet stator - wet rotor" driving pumps designed for installation in drilling wells
• submersible motors - "dry stator" propeling drainage and sewage pumps.

"Wet stator - wet rotor" - for drilling wells

Stator coil of submersible motors "wet stator - wet rotor" is wound with waterproof wires and insulation materials.

The rotor bearing in these engines is executed with two radial and one axial bearing. The axial bearing carries the rotor weight of the motor and pump and hydraulic imbalance of the pump.

The bearings are sliding and lubricated by fluid that fills the stator space.

To preserve the liquid during the service period stator space is pressurized by static and radial and/or mechanical seals. Volume expansions of liquid at different temperature regimens of the engine are compensated by volume compensator.

"Dry stator" for drainage and sewage pumps

Stator coil of submersible "dry stator" motors is wound with enamelled wires. Stator space is secured against water penetration through static compactors, wheel, mechanical and/or radial seals. There are engines of this type, in which the stator space is filled with oil.

Most often the rotor bearing in these engines is executed with rolling bearings. The axial load in these engines is borne by radial bearings.

Overhaul

Overhaul of asynchronous motors for submersible, drainage and sewage pumps includes the following activities:

• Defining the status of stator and rotor windings pin cable;
• Defining the status of static radial and/or mechanical seals;
• Defining the status of bearings and mechanical units and components;
• Stator coil rewindings; see. prices
• Static and radial and/or mechanical seal replacements;
• Bearings replacements, bearing journals welding and machining if necessary (“dry stator” motors);
• Threaded hole restorations;
• Rotor dynamic balancing;
• Asynchronous motor assembling and leak testings;
• Asynchronous motor assembling and testing in idle mode

We repair submersible motors from almost all manufacturers:

• KSB
• PLEUGER
• EMU
• ODDESSE
• RITZ
• ATURIA
• CAPRARI
• PEDROLLO
• ROTOS
• SOFFEL
• KDFU
• FLYGT
• ABS
• LOWARA
• SIGMA
• ВИПОМ
• МОЛДАВГИДРОМАШ и др.