一种新型电动汽车宽调速驱动系统设计

A Novel Wide Speed-Range Driving System Design for Electric Vehicle

针对混合励磁同步电机(Hybrid Excitation Synchronous Motor,HESM)低速大转矩和宽调速特点,本文提出了一种新型的基于HESM的宽调速系统。根据HESM的结构特点,该调速系统结合空间电压矢量脉宽调制技术,采用速度分区控制方法,将整个调速范围划分为二个速度区间,分别应用不同的电流控制策略:中低速区实施增磁或无励磁调速;高速区保持q轴反电动势基本不变,实施励磁电流与d轴电流分段联合弱磁调速。所提出的控制方法有效地提高了电机低速负载能力和最高运行转速;通过有无励磁电流调速的对比实验,验证了HESM调速系统及其控制方法的有效性。

This paper proposes a novel wide speed-range driving system based on hybrid excitation synchronous motor（HESM） due to its properties of wide speed range operation and low speed high torque. According to the structural characteristics of HESM, a stage space vector pulse width modulation（SVPWM） control method, which distributes the whole speed range into two sub-regions and employs different current regulating strategies in different sub-regions, has been adopted. In the low-middle speed range the electromagnetic torque can be improved by increasing the exciting current for flux strengthening; in the high speed range, speed is regulated by adjusting both the exciting current and the d-axis current for flux weakening while keeping the q-axis component of the back EMF invariable. With the proposed control methods, the load capability in the low speed region is improved effectively and operation speed range becomes much wider. By comparing the experimental results with and without the exciting current, the effectiveness of the proposed HESM driving system and its control methods are verified.