Studied in this paper are the principles of direct torque control drive system in three_phase voltage IGBT inverter, the control system consisting of intel 8098 microprocessor, computer emulation and a series of tests. 本文研究了三相电压型IGBT逆变器组成的直接转矩调速系统的控制原理,以及由Intel8098单片机控制系统,并进行计算机仿真和实验研究。