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七十年代中期在国外开始出现的电动铲运机,使无轨采矿进入了一个新的阶段。由于它具有许多显著优点,如能消除废气污染,降低通风成本,减少了动力源的发热量和噪声等等,因而得到广泛应用。 由于电动铲运机的动力源是交流电动机,其速度特性较硬,即电机起动后很快就达到额定转速,而遇到突变负荷时,速度的跌落亦非常明显。因此,若不采取调速措施而直接将传动部件与电动机连接,则会造成起动时难以操作,车辆行驶或转向时难以根据路面和外界情况进行速度控制等。故电动
The electric scraper, which started to emerge abroad in the mid-1970s, brought trackless mining to a new stage. Because of its many significant advantages, such as the elimination of exhaust pollution, reduce ventilation costs, reducing the power source of heat and noise, and so has been widely used. As the power source of electric scraper is AC motor, the speed characteristic is hard, that is, the motor speed reaches the rated speed soon after starting, and in sudden load, the speed drop is also very obvious. Therefore, if speed control measures are not taken and the transmission part is directly connected with the electric motor, it may be difficult to operate the vehicle at the time of starting and difficult to control the speed according to the road surface and the outside world when the vehicle runs or turns. It is electric