近年来，间接磁场定向控制（IFOC）的异步电机驱动由于其效率高、稳定性能强及功率因数高，被广泛应用在高性能驱动系统中。本文采用IFOC技术来控制异步电机的速度大小，并使用Z源逆变器，即在逆变器主电路前加上一对阻抗（LC）网络，通过控制直通占空比，可以实现升/降压功能、提高异步电机的效率。

In recent years，the asynchronous motor drive of indirect field- oriented control （IFOC）is widely used in high performance drive systems because of its high efficiency，high stable performance and power factor. In this paper，the IFOC technology is used to control the size of the speed of asynchronous motor，and the Z- source inverter is used，namely putting a pair of LC network in front of the inverter main circuit，to achieve the function of boost or buck the voltage and improve the efficiency of asynchronous motor by controlling the direct duty ratio.