电动汽车内嵌式永磁同步电机全速弱磁控制方法研究

The Rsearch on Full-speed Field Weakening Control Method of Electric Vehicle Interior Permanent Magnet Synchronous Motor

本文对内嵌式永磁同步电机的弱磁策略进行研究,提出了永磁同步电机全速范围内的弱磁控制策略。通过对内嵌式永磁同步电机的数学模型和常规矢量控制方法的研究,对内嵌式永磁同步电机全速范围内的运行工况进行了分析,将内嵌式永磁同步电机的运行工况划分为分为恒转矩运行I区、恒转矩运行II区、弱磁运行的恒功率区和弱磁运行的高速区四个区域,确定了各个区域内的控制策略算法以及区域间的过渡条件,提出了根据给定转矩和反馈转速确定内嵌式永磁同步电机交直轴电流的参考值的电流控制策略。在Matlab/Simulink下,对各个运行区域的控制策略进行建模,并针对稳态负载和动态负载两种情况进行了仿真,仿真结果验证了各个区域内弱磁控制策略的可行性。运用Matlab/Simulink下的控制模型、多体动力学软件Recur Dyn下的虚拟样机和实时仿真平台RT-LAB进行联合仿真,验证弱磁控制策略的可行性。运用实时仿真平台RT-LAB、Matlab/Simulink和Labview构建矢量控制系统半实物仿真平台,对带弱磁控制的矢量控制系统进行特性分析。

Motor drive system is a key technology for the development of electrical vehicles, permanent magnet synchronous motor has become the mainstream of the new energy vehicle drive motor because its high power density,low speed high torque density,high efficiency,high reliability. The flux-weakening control strategy for the interior permanent magnet synchronous motor（IPMSM） is study and the flux-weakening control strategy of the total speed range for IPMSM is proposed. Based on the mathematical model of IPMSM and the methods of conventional vector control, the operating condition of the IPMSM at the total speed range is analyze and divided into four regions which are the first region of constant torque operation,the second region of constant torque operation, the constant power region of flux-weakening operation and the high-speed region of flux-weakening,while the control strategy algorithm in each region and the transition conditions between regions are confirmed,the current control strategy is proposed that the d-axis current and q- axis current are confirmed by the reference torque and the feedback speed. The models of fluxweakening control strategies in each region are built by the MATLAB/Simulink, the simulations of the operating conditions with steady-state load and dynamic load are done, the results verify that the flux-weakening control strategy in each region is feasible. the flux-weakening control model for IPMSM built in Matlab/Simulink and the model car built in the dynamics software called Recur Dyn are combined to simulink on the real- time simulation platform RT- LAB, the feasibility of the flux- weakening control strategy is verified.The semi-physical simulation platform based on real-time simulation platform RT-LAB, Matlab/ Simulink and Labview is built, which is used to analysis the character of the vector control system with flux-weakening control.