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电铲在一个挖掘周期内回转约占2/3左右的时间,WK—4电铲在磁放大器控制发电机励磁的系统中采取了电压负反馈和电流截止负反馈环节,大大地缩短了回转机构的起制动时间,提高了生产率。但是回转机构有很大的惯量,过快的起动制动将引起机构冲击较大和发电机电动机主回路有大的电流冲击。 WK—4电铲规定的控制强迫系数(磁放大器实际控制安匝和额定控制安匝之比)为3～3.5。这样的强迫系数对于WK—4电铲还是感到冲击稍大。如果为了获得较为平稳的起制动而降低此强迫系数,又会减弱压低发电
Shovel in a digging cycle about 2/3 of the turn around time, WK-4 shovel in the magnetic amplifier control generator excitation system has taken the negative voltage feedback and current cut-off negative feedback, greatly reducing the slewing mechanism Of the braking time, improve productivity. However, the slewing mechanism has a large inertia. Too fast starting braking will cause a large impact on the mechanism and a large current impact on the main circuit of the generator motor. WK-4 shovel regulation of the control force coefficient (magnetic amplifier actual control ampere turns and rated control ampere turns ratio) is 3 ~ 3.5. Such a coercion factor for the WK-4 shovel still feel slightly larger. Reducing this forcing factor in order to obtain a smoother start-up will reduce the generation of electricity