In the past 10 years, due to the general adoption and absorption of new skills, new effects and mature experience of computer control, micro-mechanics, etc., electric actuators have lost their agility and development. Microcomputer-based electric machines with the "microcomputer + servo system" structure have been widely used. The implementation mechanism, the micro processor completes the signal transmission, conditioning parameter switching, status guidance, and input of mastery quantity, in order to improve the dexterity of conditioning function, operation and maintenance, etc. In fact, the quantitative purpose of reliability (R) is often used To characterize the reliability of the device, it refers to the probability that the device performs the rule function within the rule conditions and time. The "conditions of the rule" can generally be summarized as:
(1) Dynamic condition: refers to the dynamic characteristics that can affect the function of electric actuators ,
(3) Load condition: Refers to the load characteristics that can affect the function of the electric actuator. Control engineering network copyright, such as torque, type and characteristics of the controlled object, etc., the reliability is absolutely different under different conditions, separate detailed conditions Talking about reliability will have no meaning. For the sake of simplicity and intuitiveness, in the practical application of the electric actuator industry, the mean free time (MTBF) is used to characterize the feature of reliability, and it is used as a function to represent the reliability of electric actuators. purpose,
(4) Conditions of operation and maintenance: As long as the reliability of the electric actuator is completed in operation and lost during maintenance, the first thing to pay attention to in terms of the conditions of operation and maintenance is perfect operation and maintenance. Secondly, The operator must be required to reach the corresponding technical level. In order for the electric actuator to have many functions and excellent function control, it is often necessary to add the complexity of the system structure. In order to ensure that these functions and functions are put into practice during use, the reliability effect is achieved. More prominent,
The "conditions of the rule" are the most important and most overlooked part of the definition of the reliability of electric actuators.
The change law of the reliability of electric actuators during their life cycle is the basis for studying their reliability, which depends on early failure, random failure, and loss of effectiveness. The "rules of function" are parameters that characterize the fulfillment of obligations of electric actuators, such as torque , On / off and time, travel, immobility time, dead zone, etc.,
The reliability of electric actuators is generally restricted and affected by the following main factors: system selection and design, component / assembly applicability, measures parameters, mechanical structure, manufacturing technology, assembly accuracy, operation and maintenance personnel competence, operation and maintenance sequence , Operation correctness, maintenance results, on-site assembly and construction conditions, regression of the function of spare parts, transportation and application impact, etc.
(2) Environmental conditions: Refers to the environmental characteristics that can affect the function of electric actuators, such as temperature, magnetic field, humidity, air pressure, mechanical shock, vibration, dust, etc.
The reliability of the electric actuator refers to its ability to perform regular functions under regular conditions and within a regular time.
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