The deep well pump is characterized by integrating the motor and pump into one unit. It is a pump designed for pumping and transferring water from groundwater wells and is widely used in agricultural irrigation and drainage, industrial and mining enterprises, urban water supply and drainage, and wastewater treatment. Since the motor is submerged in water simultaneously, its structural requirements for the motor are more special than those of a regular motor. The motor's structural forms are divided into four types: dry type, semi-dry type, oil-filled type, and wet type.