Electric motors, as found in hybrid and electric vehicles, lack an idle state or engine start-stop. They weigh less and show considerably higher excitation frequencies while enduring high torques and rapid torque changes during acceleration and recuperation.
E-motor mounting systems often consist of 3 or 4 bushings. A proper system layout and component level innovations are needed to handle the e-motor’s high frequency excitations. Vibracoustic, as a leading global supplier of automotive NVH solutions, can offer several such technologies.
QuietType® bushings, flap bushings and double isolation are presented to elevate motor mounting system isolation in different, though partly overlapping, frequency ranges.
QuietType bushings use the specific design of a continuum-mechanical effect to achieve a significantly reduced dynamic stiffness across a broad and configurable frequency range.
Flap bushings on the other hand use additional surface features on the rubber to create a tailored mass absorber effect, thus improving the higher frequency isolation without impacting the bushing’s baseline properties. A virtual development process is applied to design and predict such mounts rapidly and accurately.
Double isolation, on mount or system level, can be combined with the aforementioned solutions.
All these solutions contribute to a better acoustic comfort in the vehicle cabin.