Drive wheel systems combined with the in-wheel permanent magnet synchronous motor（I-PMSM） and the tire are highly electromechanical-coupled. However, the deformation dynamics of this system, which may influence the ...Drive wheel systems combined with the in-wheel permanent magnet synchronous motor（I-PMSM） and the tire are highly electromechanical-coupled. However, the deformation dynamics of this system, which may influence the system performance, is neglected in most existing literatures. For this reason, a deformable tire and a detailed I-PMSM are modeled using Matlab/Simulink. Furthermore, the influence of tire/road contact interface is accurately described by the non-linear relaxation length-based model and magic formula pragmatic model. The drive wheel model used in this paper is closer to that of a real tire in contrast to the rigid tire model which is widely used. Based on the near-precise model mentioned above, the sensitivity of the dynamic tire and I-PMSM parameters to the relative error of slip ratio estimation is analyzed. Additionally, the torsional and longitudinal vibrations of the drive wheel are presented both in time and frequency domains when a quarter vehicle is started under conditions of a specific torque curve, which includes an abrupt torque change from 30 N·m to 200 N·m. The parameters sensitivity on drive wheel vibrations is also studied, and the parameters include the mass distribution ratio of tire, the tire torsional stiffness, the tire damping coefficient, and the hysteresis band of the PMSM current control algorithm. Finally, different target torque curves are compared in the simulation, which shows that the estimation error of the slip ratio gets violent, and the longitudinal force includes more fluctuation components with the increasing change rate of the torque. This paper analyzes the influence of the drive wheel deformation on the vehicle dynamic control, and provides useful information regarding the electric vehicle traction control.展开更多
永磁同步电机具有较高的效率和功率密度,在电动汽车驱动系统中广泛应用。电机的d、q轴电感是设计控制系统的重要参数,但重载情况下受磁饱和及交叉饱和影响严重。传统控制技术忽略磁饱和效应,导致转矩控制的精确性不足。采用有限元法分...永磁同步电机具有较高的效率和功率密度,在电动汽车驱动系统中广泛应用。电机的d、q轴电感是设计控制系统的重要参数,但重载情况下受磁饱和及交叉饱和影响严重。传统控制技术忽略磁饱和效应,导致转矩控制的精确性不足。采用有限元法分析电机负载时的磁饱和情况,计算考虑磁饱和及交叉饱和的d、q轴电感参数。以此为基础,拟合d、q轴电感和电流关系。设计计及磁饱和的最大转矩电流比MTPA(maximum torque per ampere)控制,使d、q轴参考电流计算中使用的电感随电机电流变化。通过对比,证明计及磁饱和的MTPA控制能够实现输出转矩的精确控制,提高永磁同步电机的动态响应性能。展开更多
针对永磁同步电机普通开环I/f控制中存在的效率低下、负载突变时易失步、I/f曲线难以规划的问题,提出了一种改进的永磁同步电机(PMSM)无位置传感器高效I/f控制方法。通过对I/f控制下电机模型的分析,计算得到电流矢量与转子磁链的交轴之...针对永磁同步电机普通开环I/f控制中存在的效率低下、负载突变时易失步、I/f曲线难以规划的问题,提出了一种改进的永磁同步电机(PMSM)无位置传感器高效I/f控制方法。通过对I/f控制下电机模型的分析,计算得到电流矢量与转子磁链的交轴之间的夹角φ,利用夹角φ调节电流矢量的幅值,使电机运行在最大转矩电流比状态;通过电机的有功功率调节电流矢量的转速,以增大系统的阻尼转矩,加快系统的转速收敛过程。为了对所提出的控制方法进行验证,在MATLAB/Simulink仿真平台上进行了测试,并且在8.3 k W表贴式永磁同步电机上进行了试验,结果表明,提出的改进I/f方法能明显提高系统运行的效率和系统的抗扰动能力。展开更多
基金Supported by National Natural Science Foundation of China(Grant Nos.51275265,51175286)National Hi-tech Research and Development Program of China(863 Program,Grant No.2012DFA81190)
文摘Drive wheel systems combined with the in-wheel permanent magnet synchronous motor（I-PMSM） and the tire are highly electromechanical-coupled. However, the deformation dynamics of this system, which may influence the system performance, is neglected in most existing literatures. For this reason, a deformable tire and a detailed I-PMSM are modeled using Matlab/Simulink. Furthermore, the influence of tire/road contact interface is accurately described by the non-linear relaxation length-based model and magic formula pragmatic model. The drive wheel model used in this paper is closer to that of a real tire in contrast to the rigid tire model which is widely used. Based on the near-precise model mentioned above, the sensitivity of the dynamic tire and I-PMSM parameters to the relative error of slip ratio estimation is analyzed. Additionally, the torsional and longitudinal vibrations of the drive wheel are presented both in time and frequency domains when a quarter vehicle is started under conditions of a specific torque curve, which includes an abrupt torque change from 30 N·m to 200 N·m. The parameters sensitivity on drive wheel vibrations is also studied, and the parameters include the mass distribution ratio of tire, the tire torsional stiffness, the tire damping coefficient, and the hysteresis band of the PMSM current control algorithm. Finally, different target torque curves are compared in the simulation, which shows that the estimation error of the slip ratio gets violent, and the longitudinal force includes more fluctuation components with the increasing change rate of the torque. This paper analyzes the influence of the drive wheel deformation on the vehicle dynamic control, and provides useful information regarding the electric vehicle traction control.
文摘永磁同步电机具有较高的效率和功率密度,在电动汽车驱动系统中广泛应用。电机的d、q轴电感是设计控制系统的重要参数,但重载情况下受磁饱和及交叉饱和影响严重。传统控制技术忽略磁饱和效应,导致转矩控制的精确性不足。采用有限元法分析电机负载时的磁饱和情况,计算考虑磁饱和及交叉饱和的d、q轴电感参数。以此为基础,拟合d、q轴电感和电流关系。设计计及磁饱和的最大转矩电流比MTPA(maximum torque per ampere)控制,使d、q轴参考电流计算中使用的电感随电机电流变化。通过对比,证明计及磁饱和的MTPA控制能够实现输出转矩的精确控制,提高永磁同步电机的动态响应性能。
文摘针对永磁同步电机普通开环I/f控制中存在的效率低下、负载突变时易失步、I/f曲线难以规划的问题,提出了一种改进的永磁同步电机(PMSM)无位置传感器高效I/f控制方法。通过对I/f控制下电机模型的分析,计算得到电流矢量与转子磁链的交轴之间的夹角φ,利用夹角φ调节电流矢量的幅值,使电机运行在最大转矩电流比状态;通过电机的有功功率调节电流矢量的转速,以增大系统的阻尼转矩,加快系统的转速收敛过程。为了对所提出的控制方法进行验证,在MATLAB/Simulink仿真平台上进行了测试,并且在8.3 k W表贴式永磁同步电机上进行了试验,结果表明,提出的改进I/f方法能明显提高系统运行的效率和系统的抗扰动能力。
