电动汽车永磁无刷轮毂电机控制策略建模

Control Tactics Modeling of Electric Vehicle Permanent Magnet Brushless Wheel Motors

针对轮毂电机的独立控制问题进行研究,分析轮毂电机的基本结构和类型,建立了无减速机构的轮毂电机动力学计算模型,探讨轮毂电机电磁转矩的控制方法。在理论分析的基础上,建立了轮毂电机的直接转矩控制方法模型、车辆控制模型和地面负载输入模型,研究不同路面情况和控制转矩输入下,轮毂电机的滑移率和轮速的差异性关系以及制动过程中定转子间隙变形情况,选择了合适的轮毂电机制动控制方法。仿真和试验结果表明,轮毂电机的转矩控制方法具有控制精度高、响应迅速的特点,搭载轮毂电机的电动汽车具有良好的操纵稳定性。

According to the independent control problems of wheel motor,the wheel motor basic structures and styles were analyzed,and dynamics model without reduction mechanisms was built and the electromagnetic torque control methods of wheel motor were discussed.The electromagnetic torque control tactics,wheel motor direct torque control model,vehicle simulation model and ground input model were set up based on theoretic analyses.Wheel motor slip rates and wheel speed differences were researched under different loads and objective torque inputs,and a favorable breaking method was chosen by compare motor stator and rotor gap deformations.The simulation and tests indicate that torque control method have high control precision,rapid response characteristics,and electric vehicle has good handling and stability.