飞机供电系统CH3直流2—调压讲解.pdf

飞机直流供电系统 第二节 电压调节 本节内容 电压调节器 振动式电压调节器 炭片式电压调节器 晶体管式电压调节器 直流发电机外特性曲线 不带调压器 带调压器 80 UN 60 40 20 0 0 200 400 600 800 1000 电流I(A) 电流I(A) 电压调节器Voltage Regulator 功用：在一定条件下自动保持发电机端电压基本恒定。 转速变化 电压调节器简称调压器 负载电流变化 Point of regulation (POR) Point of regulation 感受电源电压，以便调节电源系统输出电压的点； 调压点应设在连续电源系统和负载汇流条的主接触器的输入端 振动式电压调节器 Vibrator-type Voltage Regulator Vibrating contact regulator 振动式调压器组成 检测 ：电磁铁线圈 基准 ：反作用力弹簧 比较 ：共同作用 放大和执行 ：触点和R g 振动式调压器原理 原理： 改变触点的相对闭合时间即可调节励磁电流平均值，使发电机电压在 转速和负载变化时保持在规定范围内。 特点： 励磁电流受到触点容量限制，只能用于小容量发电机，且触点易损坏， 目前已丌用。(额定容量 1500 W 以下。) Vibrating contact regulator The regulator contains a fixed resistance that is switched in or out of the field circuit by an electro-magnetically-controlled spring-loaded switch (the vibrating contact). Vibrating contact regulator The contact points are held closed by the spring until the current flow through the voltage coil creates sufficient electromagnetism to attract the ferritic contact armature and open the points against the force of the adjustable spring. Vibrating contact regulator When generator voltage is low, the current flow through the voltage coil is insufficient to open the contact points. Field current to the shunt field winding flows through the points, creating a strong generator magnetic field and causing output voltage to rise. Vibrating contact regulator When output vol