电动执行器可靠性“规定的条件”
electric actuator reliability prescribed conditions
天蝶阀门电动执行器重要的优点：
the important advantages of electric actuators:
在接近终点位置时可自动将转速降到低，从而避免对阀门的冲撞。
when approaching the end position, the speed can be automatically reduced to a minimum to avoid collision with the valve.
实际工作力矩永远不会超过设定的关断力矩。
the actual working torque never exceeds the set cut-off torque.
柔性启动功能和电磁制动功能可确保的控制质量-高控制精度。
the flexible start function and electromagnetic brake function ensure perfect control quality - high control accuracy.
而无需另配电机保护装置。
no additional motor protection device is required.
安装调试极为简便快捷。
installation and commissioning is extremely simple and quick.
启动电流小于电机的额定电流，从而节省布线成本。
the starting current is less than the rated current of the motor, thus saving wiring costs.
防出错接线方式
anti-error wiring
的电子式电机保护功能。
full range of electronic motor protection.
阀位控制优化 如阀位控制信号和阀位反馈信号偏差很大，则以快速 度运行，如偏差很小，则以低速运行
。optimal valve position control if the deviation of the valve position control signal and the valve position feedback signal is large, the operation is performed at the fastest speed. if the deviation is small, the operation is performed at a low speed.
电动执行器的内置位置控制器可根据偏差大小 自动采用合适的输出轴转速。
the built-in position controller of the electric actuator can automatically adopt the appropriate output shaft speed according to the size of the deviation.
在制定采购计划时，型号的不确定性 在制定采购计划时，因现场的工况很难*掌握，所以 希望选定的型号到达现场后能尽可能接近实际需要。
when developing a procurement plan, the uncertainty of the model when preparing a procurement plan, it is difficult to fully grasp the conditions of the site, so it is hoped that the selected model will be as close as possible to the actual needs after arriving at the site.
电动执行器的可靠性是指它在规定的条件下、规定时间内完成规定功能的能力。
the reliability of electric actuator refers to its ability to complete the specified function within the specified time and under the specified conditions.
“规定的条件”一般可概括为：
he conditions stipulated can generally be summarized as:
(1)环境条件：指能影响电动执行机构性能的环境特性，如温度、湿度、气压、磁场、机械冲击、振动、粉尘等。
(1) environmental conditions: refer to the environmental characteristics that can affect the performance of electric actuators, such as temperature, humidity, air pressure, magnetic field, mechanical impact, vibration, and dust.
(2)动力条件：指能影响电动执行机构性能的动力特性。
(2) dynamic conditions: refers to the dynamic characteristics that can affect the performance of electric actuators.
(3)负载条件：指能影响电动执行机构性能的负载特性，如力矩、被控对象的类型与特性等。
(3) load conditions: it refers to the load characteristics that can affect the performance of the electric actuator, such as torque, the type and characteristics of the controlled object.
(4)使用和维护条件：电动执行机构的可靠性只有在使用中得以实现，并在维护中得到提高，对于使用和维护条件而言，首先要注意的是完善的使用和维护保养；其次是必须要求操作者达到相应的技术水平。
(4) usage and maintenance conditions: the reliability of electric actuators can only be achieved during use and can be improved during maintenance. for use and maintenance conditions, the first thing to notice is the perfect use and maintenance; the second is the operator must be required to reach the corresponding technical level.
“规定的条件”是电动执行机构可靠性定义中重要而又容易忽略的部分。不同条件下，其可靠性是绝然不同的，离开具体条件谈可靠性将毫无意义。而“规定的功能”是表征电动执行器构完成任务的各参量，如力矩、开/关及时间、行程、不动时间、死区等。
the conditions stipulated is the most important and most easily overlooked part of the reliability definition of electric actuators. under different conditions, their reliability is absolutely different, and reliability will be meaningless without specific conditions. function is the parameter that characterizes the electric actuator's task, such as torque, on/off and time, stroke, immobility time, dead zone, etc.
电动执行器在寿命期内的可靠性变化规律是研究其可靠性的基础，取决于早期失效、随机失效及耗损失效。理论上常用可靠度(r)这一定量指标来表征设备的可靠性，它是指设备在规定条件和时间内完成规定功能的概率。为简便直观起见，电动执行机构行业在实际使用时，简单地用平均*时间(mtbf)来表征可靠性的特征量，并作为代表
the reliability change law of the electric actuator during its life is the basis for the study of its reliability, and it depends on the early failure, random failure and consumption loss. theoretically, the reliability index (r) is used as a quantitative indicator to characterize the reliability of a device. it refers to the probability that a device performs a specified function within a specified condition and time. for simplicity and intuition, the electric actuator industry simply uses the mean time between failures (mtbf) to characterize the reliability of the feature and represents it.
电动执行器可靠性的性能指标。
电动执行器的可靠性一般受下列主要因素的制约与影响：系统选择与设计、元件/组件适用性、动作参数、机械构造、制造技术、装配度、运行与维护人员能力、操作与维护程序、操作正确性、维护结果、现场装配与施工条件、备品性能的退化、运输及使用影响等。
electrical actuator reliability performance indicators.
the reliability of electric actuators is generally limited and influenced by the following major factors: system selection and design, component/component applicability, motion parameters, mechanical construction, manufacturing techniques, assembly accuracy, operation and maintenance personnel capabilities, and operation and maintenance procedures , operational correctness, maintenance results, on-site assembly and construction conditions, degradation of the performance of spare parts, transportation and use effects.