Pumps of this type are perfect for open wells and tanks with fluctuating water levels. It is located at the bottom of the well and is designed to work under water. Water-cooled and rewindable prime movers power this machine. The winding wires in the stators are insulated with a synthetic film made of resin and are lubricated with water. This helps minimise wear on the stators. This type of assembly reduces energy loss by assembling and locking silicon steel laminates under pressure.