Abstract
The wheel-side direct-driven transmission system (WDTS) is a new intelligent transmission technology, which has significant advantages in high-efficiency and few malfunctions for the electric bus. Based on the Lagrange–Maxwell equation, the WDTS electromechanical coupling dynamic model, whose effectiveness is verified by the PMSM speed, is constructed for analyzing the system torsional vibration destabilization characteristics. Then, by determining the resonance curve equation for the torsional vibration response amplitude of the WDTS with the direct multi-scale method, the influences of the torque ripple amplitude of the PMSM and the transmission clearance on the system torsional vibration stability are analyzed. The results indicate that the WDTS torsional vibration response shows complex nonlinear characteristics especially under the effect of the system transmission clearance, which has an important impact on the system stable operation. The research results can lay a theoretical foundation for the design of the WDTS of the electric bus.
Highlights
Engineering Research and Training Center, Anhui Polytechnic University, Wuhu 241000, China; Abstract: The wheel-side direct-driven transmission system (WDTS) is a new intelligent transmission technology, which has significant advantages in high-efficiency and few malfunctions for the electric bus
In order to realize the effective application of the high-power permanent magnet synchronous motor (PMSM) in the wheel-side drive system of the electric bus, it is necessary to improve the load adaptability of the WDTS, and ensure the system torsional vibration is stable under the load disturbance and the electromechanical coupling excitation of the high-power PMSM
Equation (32) is the resonance curve equation of the torsional vibration response amplitude of the WDTS, which is the function of the tuning parameters, the PMSM torque disturbance excitation amplitude and the system transmission clearance
Summary
With the advantages of zero-emission, low noise, and simple operation, the electric bus has gradually become the main form of the city bus [1,2]. In order to realize the effective application of the high-power PMSM in the wheel-side drive system of the electric bus, it is necessary to improve the load adaptability of the WDTS, and ensure the system torsional vibration is stable under the load disturbance and the electromechanical coupling excitation of the high-power PMSM. The torsional vibration coupling excitations among the electromagnetic parameters of the PMSM, the dynamic parameters of the mechanical transmission system, and the load disturbance, affect the safe and stable operation of the system. A virtual simulation experiment platform is built to verify the accuracy of the dynamic model through the PMSM speed output; based on the direct multi-scale method, the resonance curve equation for the torsional vibration response amplitude of the WDTS is determined, and the influences of the motor torque disturbance and the transmission clearance on the system torsional vibration stability are analyzed.
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