非簧载质量和轮毂电机偏心对轮毂电机驱动电动汽车平顺性的影响

Effect of Unsprung Mass and in-Wheel Motor Eccentricity on Rider Motor Driven Electric Vehicle Ride Comfort

以某电动汽车(EV)为研究对象,构建了8自由度车辆动力学模型,并通过频域及时域分析探究非簧载质量增加对车辆平顺性评价指标的影响。考虑到轮毂电机因制造安装误差等原因而产生不平衡磁拉力,为探究其对车辆平顺性的影响,在ANSYSMaxwell软件中分别建立外转子永磁无刷直流轮毂电机静态偏心和动态偏心的模型,研究轮毂电机偏心情况下不平衡磁拉力特性,并在时域内分析轮毂电机驱动电动汽车在路面及轮毂电机不平衡磁拉力耦合激励下的平顺性。分析结果表明:非簧载质量增加和不平衡磁拉力导致轮胎动载荷明显增加,但座椅垂向加速度没有明显变化。

Taking an electric vehicle(EV)as the research object,an 8-DOF vehicle dynamics model is constructed,and the influence of unsprung mass increase on vehicle ride comfort evaluation index is explored through frequency domain and time domain analysis.Considering the unbalanced magnetic pull of hub motor due to manufacturing and installation errors,etc,in order to explore its impact on vehicle ride comfort,the static eccentricity and dynamic eccentricity models of outer rotor permanent magnet brushless DC hub motor are established in ANSYS Maxwell software to study the unbalanced magnetic pull characteristics of hub motor with eccentricity,and the ride comfort of the electric vehicle driven by the hub motor under the coupling excitation of the unbalanced magnetic pull of the road and the hub motor is analyzed in the time domain.The results show that the increase of unsprung mass and unbalanced magnetic pull lead to the increase of tire dynamic load,but the vertical acceleration of the seat has no obvious change.