基于直接转矩控制的电动助力转向系统建模与仿真

Modeling and Simulation of Electric Power Steering System Based on Direct Torque Control

直接转矩控制(DTC)理论已经从异步电机拓展到永磁同步电机(PMSM)。现今大多数汽车电动助力转向(EPS)系统使用的都是永磁同步电机。本文从永磁同步电机的电机模型出发,对直接转矩控制方法进行了分析与推导,并搭建了EPS系统在Carsim与Simulink下的联合仿真模型,并进行了仿真试验。仿真结果证明了EPS系统采用直接转矩控制方法时,可以有效地提高汽车的转向轻便性,且具有启动速度快的特点。

The theory of direct torque control system has been extended to permanent magnet synchronous motor （PMSM）. Most of Electric Power Steering（EPS） system adopts a permanent magnet synchronous motor （PMSM）. In this paper, the direct torque control strategy is analyzed and deduced which is based on the model of permanent magnet synchronous motor, and co- simulation of Carsim and Simulink is established. The result shows that EPS system which adopts DTC control strategy has the characteristics of fast dynamic response.