挖 掘机Ｆ－Ｄ电控系统的发电机电压是利用可控硅单相 半控桥励磁电流建立的，可控硅的触发器由磁放大器所组成，它综合控制信号方便，采用双闭环（电压负反馈，电流负反馈）环节．保证了Ｆ－Ｄ电控系统的整个起动过程加快，调速性能、生产效率大大提高。 １Ｆ－Ｄ电控系统存在 Excavator F-D electronic control system of the generator voltage is the use of silicon controlled rectifier single-phase half-bridge current excitation established, the SCR trigger by the magnetic amplifier, which combines the convenience of the control signal, the use of double closed-loop (voltage Negative feedback, negative feedback current) link. To ensure that the F-D electronic control system to speed up the entire starting process, speed performance, greatly improve production efficiency. 1F-D electronic control system exists