变频调速是通过变频器改变电动机供电电源频率进行调速的一种方法。由于变频器能适应生产工艺的多方面要求,具有调速性能好、调速范围宽、运行效率高、使用操作方便、宜于同其他设备接口等一系列优点。因此,应用越来越广泛。现在通用的变频器,大多使 Frequency control is a method of speed control by changing the frequency of the motor’s power supply. As the frequency converter can adapt to many aspects of the production process requirements, with a good speed performance, speed range, high operating efficiency, easy to use, suitable for interface with other devices and a series of advantages. Therefore, the application is more and more widely. Now common inverter, mostly used