The first electric actuators basicelement that has an influence on the performance of electric actuator is drive power. There are two kinds of commonly used drive power, power supply and fluid power supply. The power supply should be matched up with three-phase supply to drive valves with large dimension. However, as for valves with small dimension, it is possible to use single-step supply. Generally speaking, there are different kinds of electric actuators to meet the demand of users. Sometimes, when using direct current supply, it is probable to use supply mistakes security operation by installing power supply. As for liquid power supply, it requires different media like compressed air, ordinary air as well as hydraulic pressure liquid. And in order to provide output force moment, the electric actuators possess multiple classifications and specifications to satisfy the demand of customers.

Another electric actuators basicelement that decides the performance of electric actuators is the classification of valve. It is better to understand the classifications of the valves and then make clear the performance of electric actuators according to different valve classifications. Some valves are equipped with multiple rotations drive, some valves are equipped with single rotation drive and others need circulation rotation drive, so it is necessary to match up with different drives according to the classification of electric actuators. Generally, the electric actuator with multiple rotations of pneumatic actuator is dearer than that of electric actuators.

The next electric actuators basicelement that influences the performance of electric actuators is moment magnitude. The electric actuators are equipped with many small valves like ball valve, butterfly valve as well as plug valve which are able to rotate for 90 degrees. It is possible to get moment from electric actuators manufacturers. Qualified electric actuators manufacturers would like to measure the moment under rated pressure before selling it. And when you purchase the electric actuators, they will introduce this to you.

Apart from the classification of pneumatic actuators, the classification of electric actuator is also one electric actuators basicelement that has an influence on the performance of electric actuator. Only the classification of electric actuators have been done can the valves and valve moment be set. And then the electric actuator manufacturers would like to help with choosing the type of electric actuators. Sometimes, it is necessary to consider other factors like running speed as well as quantity of valves.

In conclusion, all these are important electric actuators basicelements that are able to decide the performance of electric actuators.

Actuator online fault diagnosis is realized by using the method of fuzzy information fusion, and then the actuator chooses the preset malfunction self-protection measures according to the output of the fault self-diagnosis. Actuator online fault diagnosis is based on a large amount of prior knowledge. According to the fault characteristic information and actuator preset operation parameters, the real-time accurate judgment of network anomalies in the working process of the electric actuator will be made by using fuzzy information fusion technology to provide decision-making basis for the real-time protection of networked electric actuator’s fault.Since most of the work environment of pneumatic actuators is very bad, the actuator generally is in seal installation, therefore it is not easy to add new fault characteristic information acquisition unit.

The fault characteristic information of pneumatic actuators mainly comes from all kinds of equipment information and status signal contained by the actuator online itself during the operation of equipment, such as the motor temperature, working current, rotor speed and position sensor output value, semaphore, runtime, letters between data package, etc.The cause of the problem reflected by each kind of fault characteristic information of actuator online is different, and the correlation degree between each other is also different. Since the networked electric actuator may occur more failures with large scale of knowledge, but on the other hand, network fault characteristics of the electric actuator after dealing with the information fusion can directly be inferred, so this article applies the rules of the expert system for fault diagnosis, considering the network real-time electric actuator fault diagnosis and protection. Rule-based expert system reasoning machine compares the facts (fault feature information of melting results) with the precondition of rule in the knowledge base (the default) and activates relative rules to obtain evaluation results from expert system.

To improve the real-time network pneumatic actuators fault self-diagnosis, knowledge base of expert system needs to be combed, simplified to get clear rules so that the program of micro processing unit of networked electric actuator can be realized. The combination of networked electric actuator fault characteristic information fusion and rule-based expert system greatly simplifies the number of rules in the knowledge base of expert system, providing guarantee for the realization of the real-time fault diagnosis.