天蝶阀门电动执行器的结构说明
Structure description of Tandy Valve's electric actuator

电动执行器是由电动机、减速器、力矩行程限制器、开关控制箱、手轮、机械限位装置组成的。那么每个部位究竟有什么用呢，天蝶阀门小编带您一起来看看吧。
The electric actuator is composed of motor speed reducer, torque stroke limiter, switch control box, hand wheel, and mechanical limiter. So what's the use each part? Let's take a look.

1、电动机：电动机是特种单相或三相交流异步电动机，具有高启动力矩、低启动电流和较小的转动惯量，因而有较好的伺服特性。在电动机定子内部装有热敏开关做过热保护，当电动机出现异常过热(内部温度超过130℃)时该开关将控制电动机的电路断开以保护电动执行机构，当电动机冷却以后开关恢复接通，电路恢复工作。为了克服惯性惰走，电动执行机构的电动机控制电路均有电制动功能.

1. Motor: The motor is a special single-phase or three-phase AC asynchronous motor, with high starting torque, low starting current and small moment of inertia, and therefore has better servo characteristics. The motor stator is equipped with a thermal switch for overheat protection. When the motor is abnormally overheated (internal temperature exceeds 130°C), the switch will control the motor circuit to protect the electric actuator. When the motor is cooled, the switch is turned back on. The circuit resumes work. In order to overcome inertial idleness, the motor control circuit of the electric actuator has an electric brake function.

2、减速器：角行程执行机构采用行星减速加涡轮涡杆传动机构，既有较高的机械效率，又具有机械自锁特性。直行程执行机构的减速器由多转执行机构减速器配接丝杆螺母传动装置组成。
2. Reducer: The rotary actuator adopts planetary reduction and turbo-worm transmission mechanism, which has high mechanical efficiency and mechanical self-locking characteristics. The reducer of the linear travel actuator is composed of a multi-turn actuator reducer and a screw nut transmission.

3、力矩行程限制器：它是一个设置在减速器内的标准单元，由过力矩保护机构、行程控制机构(电气限位)、位置传感器及接线端子等组成。
3. Torque travel limiter: It is a standard unit set in the reducer, by the over-torque protection mechanism, travel control mechanism (electric limit), position sensor and wiring terminals and other components.

4、开关控制箱：在开关控制箱内装有PM电子位置定位器。
4. Switch control box: In the switch control box is equipped with PM electronic position locator.

5、手轮：在故障状态和调试过程中，可通过转动手轮来实现手动就地操作。
5. Hand wheel: In the fault state and debugging process, manual operation can be achieved by turning the hand wheel.

6、机械限位装置：主要用于故障时以及防止手动操作时超过极限位置保护。电动执行器的机械限位采用内置扇形涡轮限位结构，外形体积小，限位可靠;电动执行机构的机械限位采用内置挡块型限位结构，可十分有效地保护阀座、阀杆、阀芯。
6. Mechanical limit device: mainly used for failure and to prevent over-limit position protection during manual operation. The mechanical limit of the angular stroke electric actuator adopts a built-in fan turbine limit structure, small size, reliable limit; the mechanical limit of the electric actuator adopts a built-in stopper type limit structure, which can effectively protect the valve seat and valve Rod, spool.