Noise-reduction measures in the powertrain enhance the fuel cell vehicle’s already outstanding quietness

Powered by an electric motor, the fuel cell vehicle offers outstanding quietness, with none of the vibration or exhaust noise associated with the engine of a gasoline-engine car. In addition, the new FCX further reduces intake noise and noise and vibration in the air pump, to achieve even quieter, more comfortable driving than the previous model.
Powertrain noise-reduction measures
New technologies
· Solid construction in the air pump rotor
  By switching from a hollow to a solid construction in the air pump rotor, air column resonance is suppressed, resulting in decreased intake noise. Passenger compartment noise is reduced by 10dB over the previous model.
· Resin molding in the traction motor stator
  Resin molding is used for the wound portion of the motor stator to improve the stator’s overall rigidity, reducing resonance vibration in the motor. Passenger compartment noise is reduced by 6dB over the previous model.
Technologies from the previous model
· Muffled resonator chamber and unitized intake module
  A compact, modular resonator chamber suppresses intake noise radiation over a broad frequency band.
· Double floating mounts
  The air pump and the air pump motor are secured to the motor and transmission with rubber mounts, which in turn are secured to the sub-frame with rubber mounts, resulting in a two-stage reduction of air pump rotational vibration to the body.
Comparison of traction motor stator construction
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