FACT BOOK
FCX 2002.12.2


Energy loss reduction technology and a heat-management design,
for high efficiency over a wide range and an expanded power band
The drive motor for the FCX is a further development and refinement of the highperformance technology Honda developed for the EV-Plus electric vehicle. First, reluctance torque combined with a low-loss magnetic circuit and full-range, fulldigital vector control were applied to secure high efficiency over a broad output range, along with an expanded power band. Then heat generation in the rotor was also controlled to expand the power band in the high-rev range.
Comparison of drive motor performance
To respond to increased magnetic flux variations in the rotor due to reluctance torque, magnetic partitioning was employed to greatly suppress the occurrence of eddy currents. Newly developed high heat-resistant magnets and a magnetic circuit configuration appropriate for high output further achieved a high demagnetization suppression effect. The result is an expanded high-output range at high revs, and the securing of continuous rated output at maximum output.
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 noises associated with the engine of a gasoline-powered car. In addition, the FCX further reduces intake noise and noise and vibration in the air pump, to achieve even quieter, more comfortable driving.

Powertrain noise-reduction measures
· Muffled resonator chamber and unitized intake module
A compact, module-type 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 as well, resulting in a two-stage reduction of air pump rotational vibration to the body.
A lightweight, compact motor and transmission with unitized constructionsingle-speed,
fixed reduction ratio utilizes the motor's output characteristics to maximum effect
The simple, high-efficiency transmission transmits power to the differential through a two-stage reduction from main (primary) to counter (secondary) to final. Built for high revs and high output, the unit has also been made more lightweight and compact. This allows the FCX to offer distinctively smooth, powerful performance, while at the same time offering the packaging merit of permitting a large radiator to be installed, contributing to improved cooling performance.
Main improvements over the EV-Plus
· Reduced distance between motor and differential shafts (208mm175mm)
· Reduced length front-to-rear (353mm301mm)
· Increased motor output (49kW60kW)
· High-rev compatible (maximum engine speed: 8,750rpm11,000rpm)
Comparison of transmission dimensions (units: mm) Positioning of motor, transmission and
radiator
(Values based on Honda in-house testing)



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