在机床的电力拖动中,经常要用到能耗制动。过去,能耗制动通常采用如(图1)的控制线路。这种方案存在着如下缺点:一、需要一台专门的制动用降压变压器。这不但使配电箱的体积增大,而且笨重,成本也高;二、通用性差;三、设计和制造变压器周期长。最近,我厂在一些专用设备中,应用可控硅半波整流进行能耗制动,效 Power drag in the machine, often to use energy braking. In the past, energy-consuming braking usually used (Figure 1) control circuit. This program has the following disadvantages: First, the need for a dedicated brake with step-down transformer. This will not only increase the size of the distribution box, but also bulky, high cost; Second, poor universality; Third, the design and manufacture of long transformer cycle. Recently, I plant in some special equipment, the application of SCR half-wave rectifier energy braking, the effect