天蝶閥門電動執行器的結構說明
Structure description of Tandy Valve's electric actuator

電動執行器是由電動機、減速器、力矩行程限制器、開關控制箱、手輪、機械限位裝置組成的。那么每個部位究竟有什么用呢，天蝶閥門小編帶您一起來看看吧。
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、電動機：電動機是特種單相或三相交流異步電動機，具有高啟動力矩、低啟動電流和較小的轉動慣量，因而有較好的伺服特性。在電動機定子內部裝有熱敏開關做過熱保護，當電動機出現異常過熱(內部溫度超過130℃)時該開關將控制電動機的電路斷開以保護電動執行機構，當電動機冷卻以后開關恢復接通，電路恢復工作。為了克服慣性惰走，電動執行機構的電動機控制電路均有電制動功能.

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、減速器：角行程執行機構采用行星減速加渦輪渦桿傳動機構，既有較高的機械效率，又具有機械自鎖特性。直行程執行機構的減速器由多轉執行機構減速器配接絲桿螺母傳動裝置組成。
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：它是一個設置在減速器內的標準單元，由過力矩保護機構、行程控制機構(電氣限位)、位置傳感器及接線端子等組成。
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、開關控制箱：在開關控制箱內裝有PM電子位置定位器。
4. Switch control box: In the switch control box is equipped with PM electronic position locator.

5、手輪：在故障狀態和調試過程中，可通過轉動手輪來實現手動就地操作。
5. Hand wheel: In the fault state and debugging process, manual operation can be achieved by turning the hand wheel.

6、機械限位裝置：主要用于故障時以及防止手動操作時超過極限位置保護。電動執行器的機械限位采用內置扇形渦輪限位結構，外形體積小，限位可靠;電動執行機構的機械限位采用內置擋塊型限位結構，可十分有效地保護閥座、閥桿、閥芯。
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.