The purpose of the stator winding RTD is to mainly detect and prevent overheating of motors. It is inserted between a stator and a slot to measure a temperature. Stator winding RTD uses the phenomenon of changing electric resistance to measure a temperature. Since it has high stability and sensitivity, it is used to measure a temperature precisely. Furthermore, it is made of a nonmetallic material, and, therefore, it has a structure of protecting element. It is designed well enough to get flexibility and to endure vibration and high pressure.