Electric actuator reliability mean it under specified conditions, completion within timeframe required function ability. "The conditions stipulated in the" general can be summarized as: (1) : refers to the environmental conditions can influence electric actuators performance of environmental features, such as temperature, humidity, air pressure, magnetic field and mechanical shock, vibration, dust etc. (2) : refers to the dynamic conditions can influence electric actuators performance of dynamic characteristics. (3) : refers to the load conditions can influence electric actuators properties of the load characteristics, such as torque, controlled object types and characteristics, etc. (4) use and maintenance condition: electric actuator reliability only in use can be realized, and the maintenance of improved, and to use and maintenance condition is concerned, notice first is perfect usage and maintenance, Next is must ask operator to corresponding technical level.

"The conditions stipulated in the" is electric actuators definition of reliability in the most important and the most easily ignored part. Different conditions, its reliability is 180 degrees apart, leave of specific conditions about reliability is meaningless. While "prescribed function" is characterization of electric actuators to complete the task of various parameters, such as the torque, open/close and time, schedule, fixed time, dead zone, etc.

Electric actuators in life period the reliability change rule is to study the reliability of the foundation, depends on the early scrapping, random failure and spent failure. Theoretically common reliability (R) this amount index to represent the reliability of equipments, it is to point to equipment in prescribed conditions and finish required function of probability. For simple intuitive, officers-in-charge of electric actuators industry in practical use, simple to use MTBF (MTBF to characterize the reliability of the characteristic, and as a representative of electric actuators reliability of performance indicators.