一种基于开关次数最小的含零电压矢量永磁同步电机直接转矩控制开关表

摘要

介绍了永磁同步电机(PMSM)直接转矩控制(DTC)理论,研究了零电压矢量的作用.基于开关次数最小提出了选择零电压矢量的策略,给出了一种新型含零电压矢量开关表.仿真结果表明使用新型开关表PMSM DTC系统能正常驱动.与传统开关表相比,使用新型开关表DTC系统开关次数降低了近56％,进而降低了开关损耗.%The theory of direct torque control (DTC) in permanent magnet synchronous motor (PMSM) was investigated.The effect of zero voltage vectors for the PMSM DTC drives was analyzed.The strategy of selecting zero voltage vector was proposed based on the minimum switching times,and a new switching table with zero voltage vectors was given.Simulation results showed that the PMSM DTC system could work properly using the new table.Switching times of the DTC system using new switching table were decreased by direct torque control nearly 56％ compared to conventional switching table,therefore,switching loss was decreased.