Abstract: Different from the mechanical noise and the combustion noise of low-frequency order ignition in internal combustion engine, the noise of electric drive assembly in electric vehicles is mainly the high-frequency whistling generated by electromagnetic force and gear meshing. Noise below 2000-2500 Hz of electric drive assembly propagates into vehicle cabin mainly through structural paths. In view of the high torque of the driving motor of electric vehicles, the vibration isolation performance of electric drive assembly mounts should be as high as possible while ensuring their torsion resistant performance. In this paper, the powertrain vibration characteristics of electric vehicle and traditional fuel vehicle as well as the angular displacement around transverse axis and forces of mounts in different mount layout schemes are compared, and the main factors affecting the vibration isolation rates of electric drive assembly are analyzed. Finally, the general design principles for the drive assembly mounts of electric vehicle are summarized.

Key words: electric vehicle, electric drive assembly, mount, isolation, design principle