Abstract
For an in-wheel motor driving system with rubber bushings, the driving motor is integrated into the wheel. A magnet gap deformation of the motor will be inevitably caused by the road excitation, which will produce an unbalanced electromagnetic force and influence the power-train vibration. Furthermore, the rim is flexibly connected to the motor rotor by rubber bushings, and a strong coupling and nonlinear vibration of the power-train in all directions can be demonstrated under the electromagnetic excitations. Thus, a 14-degree-of-freedom coupling vibration model of the power-train is first developed for the in-wheel motor driving system with rubber bushings, including the bushing and bearing models. Then, the mathematical model is deduced using a Lagrangian approach. Finally, based on the model, a coupling vibration analysis is conducted under different electromagnetic force excitations. The results indicate that there are coupling vibration components in the torsional direction, except the one-time rotating frequency; however, in the bending direction, the vibration response includes a one-time rotating frequency component and an excitation frequency component of the electromagnetic force. Furthermore, the results indicate that the bushing plays an important role in reducing the power-train vibration, which has a positive effect on the improving vehicle dynamics.
Highlights
Torsional and bending vibrations are the primary forms of vibration in a vehicle power-train
Based on the coupling vibration model, further analysis on the effects of the electromagnetic force (EMF) on the vibration response of the power-train is performed under a single harmonic excitation condition
A few conclusions can be obtained as follows: 1. the power-train of the inwheel motor (IWM) driving system with rubber bushings is relatively short, the IWM EMF caused by the road excitation will have an effect on the vibration characteristics of the power-train
Summary
Torsional and bending vibrations are the primary forms of vibration in a vehicle power-train. A 14-degree-of-freedom coupling vibration model of the power-train for an IWM driving system with rubber bushings is initially developed using a Lagrangian approach.
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