在地铁同一转向架下单逆变器控制两并联异步电机的结构中，轮径差或电机参数不同等因素会导致电机间转矩差和转矩脉动较大。针对这一问题，建立了地铁同一转向架下双异步电机并联时速度耦合的负载模型，采用基于空间矢量调制(SVM)的直接转矩控制(DTC)策略，引入实时计算的加权系数，使DTC权重偏向于转矩较小的电机。该控制方案具有转矩波动更小、逆变器开关频率恒定和电机间的转矩差较小的特点。仿真结果表明，相对于平均DTC，所提出的加权DTC方法有效减小了电机转矩差和降低了转矩脉动。

In the structure of two parallel-connected asynchronous motors controlled by a single inverter under the same bogie of metro, factors such as wheel diameter difference or different motor parameters will lead to the large torque difference between the motors and torque ripple. In order to solve this problem, a speed coupling load model of double asynchronous motors in parallel under the same bogie of metro is established. The direct torque control strategy based on space vector modulation is adopted, and the weighting coefficient of real-time calculation is introduced, so that the weight of direct torque control tends to the motor with smaller torque. The control scheme has the characteristics of smaller torque ripple, constant switching frequency of inverter, and smaller torque difference between motors. The simulation results show that compared with the average direct torque control, the weighted direct torque control method can effectively reduce the torque difference between the motors and decrease the torque ripple.