The life of the modified stator and rotor of motor is directly related to the design of stator and rotor, material composition, drilling fluid and motor speed. It is no problem to use 10 years in normal environment.

The fixed part of the motor is called the stator. The stator is equipped with pairs of stationary main poles, which are excited by DC. The rotating part is called the rotor, and the rotor is equipped with armature windings.