These types of pumps are ideal for open wells or tanks with wide fluctuations in water levels. Located at the bottom of the well, this is designed to work under water. A rewindable and water-cooled prime mover is used. To withstand the axial thrust loads with minimum wear and tear, specially designed water lubricated bearings are used, and the winding wires in the stators are coated with a special synthetic film insulation. Silicon steel laminations with low energy loss are assembled under pressure and rigidly locked together.