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长期以来,电机车是采用鼓形控制器改变串接在电枢中电阻值的大小而实现调速的,不但浪费电能,而且由于动作频繁,触头严重烧毁,维修工作量大,又因鼓形控制器体积大,司机工作条件也差,近年来已出现多种形式的可控硅脉冲调速装置,其主电路均采用“定频调宽反振式”,触发电路有单稳及双稳态触发器两大类,有的还对防止失控采取了一定措施,但失控现象依然存在。有些情况下的失控不可避免,如起动后过快调速,往往出现由于换流
For a long time, the electric locomotive adopts the drum controller to change the resistance value in series in the armature to realize the speed regulation, which not only wastes the electric energy but also burns severely because of frequent movements and heavy maintenance work, Shape controller is bulky, the driver working conditions are poor, in recent years there have been many forms of SCR pulse speed control device, the main circuit are used “fixed frequency widening anti-vibration”, the trigger circuit has a single and double Steady state trigger two categories, and some also to prevent loss of control to take some measures, but out of control phenomenon still exists. In some cases, the loss of control is inevitable, such as speeding too fast after starting, often due to commutation