Question

200分高分求英语短文翻译，要专业，机器翻译勿来哦！！！

下面是文章：
龙门刨床是一种工作台做往复运动和固定的刨刀做相对运动的大型刨削机器，主要用于刨削大型工件，也可以在工作台上同时加工多个零件，是工业的母机。
按照龙门刨床的工作特点，要求电动机既能正传、也能反转，而且也能快速的启动和制动，这就要求电动机的电力拖动系统能够拥有四象限运行的特性，也就是可逆调速系统。
可逆直流调速系统采用晶闸管-电动机系统。采用两组晶闸管整流装置反并联方法从而实现系统的可逆运行。但是，如果两组装置的整流电压同时出现，便会产生不流过负载而直接在两组晶闸管之间流通的短路电流，称为环流，会加重晶闸管和变压器的负担，严重时甚至会损坏晶闸管，这就需采用α=β控制消除直流环流，使整流装置处于整流状态，同时加入环流电抗器来抑制瞬时脉动环流，从而形成自然环流系统。

Answer 1

Gantry planer is a table reciprocating and stationary planing machine planing to do a large relative motion, mainly for planing large workpieces to be processed multiple parts on the table at the same time, the machine tools industry.
Planer work according to the characteristics of the motor is required both to Story, also be reversed, but also can quickly start and braking, which requires motor electric drive system can have a characteristic four-quadrant operation, which is reversible transfer speed systems.
Reversible DC speed control system using thyristor - motor system. Two sets of anti-parallel thyristor rectifier in order to achieve a reversible method of operation of the system. However, if the two devices appear rectified voltage simultaneously, there will be no flow through the load and circulating directly between two thyristor short-circuit current, called the circulation, will increase the burden thyristors and transformers, serious and even cause damage to the thyristor , which requires the use of α = β control eliminates DC circulation, the rectification means is rectified state, while adding circulation reactor to suppress ripple instantaneous circulation, thereby forming a natural circulation system.