水文测验中,为了保证测深精度和准确地将流速仪放到测点,电动绞车的升降电动机往往需要制动。在目前采用的制动方式中,我们的经验证明,对电动绞车所使用的1.5千瓦左右小容量电动机而言,能耗制动既简单便宜,又行之有效。图1中虚线框内是我们应用的能耗制动主回路。根据计算,采用单相半波整流电路。其工作原理是大家所熟悉的,这里不再赘述。有一点须特别指出,即 Hydrographic test, in order to ensure the sounding accuracy and accuracy of the flow meter on the measuring point, electric winch lift motor often need to brake. Among the braking systems currently in use, our experience shows that energy-efficient braking is both simple, inexpensive and effective for small 1.5-kW motors used in electric winches. The dashed box in Figure 1 is the main circuit of energy-consuming brake that we apply. According to calculation, using single-phase half-wave rectifier circuit. The working principle is familiar to everyone, will not repeat them here. It is important to point out that