关键词: 感应电机, 直接转矩控制, 启动电流

Abstract:

In order to solve the problem of high starting current of direct torque control (DTC) systems for induction motors,this paper proposes applying the DC preexcitation technology to DTC,which means a switch between a zero voltage vector and a fixed active vector.When the current exceeds the set value the system will be switched to the zero voltage vector.Simulation and experimental results show that the new DTC strategy effectively reduces the startup current,increases the startup torque,and improves the performance of the DTC.