Experimental and Theoretical Analysis of Horizontal Order Vibration Characteristics of Electric Wheel Under Torque Ripple

Abstract:

In order to study the new electric wheel vibration problems caused by torque ripple, the electric wheel vibrations under working conditions were measured in bench experiment, and order features and highfrequency characteristics of tire horizontal vibration were revealed. Based on analytical model of electromagnetic torque, and considering nonsinusoidal magnetic field distribution and current harmonics, torque ripple features were analyzed from the point of view of magnetic field interaction. Then, the order features of tire vibration were explained by source analysis of torque ripple. The 6th order vibration arises from nonsinusoidal magnetic field distribution while the first order vibration arises from current harmonics, and the 5.0th, 5.5th and 6.5th order vibrations arise from the interaction of nonsinusoidal magnetic field distribution and current harmonics. Based on the rigid ring tire assumption, the dynamics model of electric wheel system was established and modal analysis was conducted.

Key words:electric wheel; torque ripple; horizontal highfrequency vibration; order feature