Oil filled type deep well pump using this cooling method. Oil filled motor internal filled withinsulation oil, its stator core, stator winding, rotor iron core and rotor winding (rotor and rotor end ring) and other components are immersed in oil. Part of the resistance loss resistance loss and end winding of motor stator iron stator slot winding loss, the heat generated directly through the stator core, the casing to pass through the surface of the casing wells away. The rotor winding and the rotor iron loss resistance loss of heat generated by the oil gap in part by directly transmitted to the stator, the outer casing to the motor wells the other part passed away; the rotor cavity filling Bo liquid, the end winding of this part of the heat and the stator to another part of the oil cavity heat resistance loss and mechanical loss of heat generated by the inner together. The cavity is filled with oil, which is passed to the stator core, the casing and the bearing seat. Finally, the well water is taken away from the surface of the motor casing and the bearing seat and other parts.
