目前,国产电梯大都采用切换电阻来实现开门电机的调速。这种开门电机控制系统故障率很高,开关门噪声不易控制。这里介绍一种国外引进的采用脉宽调制的开门机控制系统。该系统由方波发生器、速度给定器、重开门控制器、夹紧力控制器、开关电路等部分组成,采用30V、72W直流永磁电动机。系统原理方框图如图1。 At present, most domestic elevators use switching resistors to achieve speed control of open-door motors. This kind of door opening motor control system has a high failure rate and it is difficult to control the door and door noise. This introduces a foreign introduction of the pulse width modulation open door control system. The system consists of square wave generator, speed setter, re-opening door controller, clamping force controller, switch circuit and other parts, using 30V, 72W DC permanent magnet motor. System block diagram shown in Figure 1.