本文就调速系统的种类进行了简单介绍，着重分析了变频器的工作原理、控制方式、选型以及变频器在工程实际应用中使用经验，供工程人员借鉴。-Brief the type of speed control system, analyzed the working principle of the inverter control mode selection, as well as the inverter used in the practical application of engineering