三相异步电动机是机床的动力设备,它的作用是拖动机床进行机械加工,根据机械加工的工艺要求,电动机经常处于静止、起动、运行和制动四种状态。在这一讲中我们主要向读者介绍起动与制动的基本工作原理及其控制线路。那么,什么是三相异步电动机的起动呢?简而言之就是,让静止的电机旋转起来,称为起动。由于三相异步电动机起动时的电流很大,约为额定电流的4～7倍,将给电网造成很大的波 The three-phase asynchronous motor is the power equipment of the machine tool. Its function is to drag the machine tool for machining. According to the machining requirements of the machine, the motor is often in four states of standstill, starting, running and braking. In this talk, we mainly introduce the reader to the basic working principle of starting and braking and its control circuit. So, what is the start of three-phase asynchronous motor? In short, let the stationary motor rotate, called the start. As the three-phase asynchronous motor starting current is large, about 4 to 7 times the rated current, will cause a great wave to the grid