Lexus Design Award 2014


E-Wheel by Phuoc Nguyen from vietnam

designer's own words:

E-Wheel is the new cutting edge of pedal electric cycle (pedelec). It is not only unique and eco-friendly but also very lightweight. E-Wheel is integrated ALL IN ONE: include 200W electric motor, 36V - 8.9Ah – 320Wh lithium-ion battery, electrics drive and so on. E-Wheel can run up to 60km on one full charged and the maximum speed is 25 km/h. E-Wheel has the wireless technology for remote control and battery charge. You can control E-wheel by your mobile phone (or control console).
E-Wheel are suited for a wide variety of people who are not able or not willing to ride a conventional bicycle or who simply need faster transportation, most efficient means of transport in town.
• Maximum range based on one battery full charge, using 150% assistance mode, according to use in ideal conditions.
• Distance will vary depending on road conditions, riding surface, cyclist’s weight and required assistance.
• System does not include disc brake rotor and freewheel (which available in single, 5 and up to 6 speed).
• All electric component (electric drive, hall sensor, torque sensor and wire cable) are neglected just for simplyfing all level of detail.
The battery pack shell material is one of the most importance parts in the E-Wheel. Because lithium-ion battery cell is very sensitive, it always becomes hotter during work and when they are charged. So, the material must have durable, high thermal conductivities, and absorb the shock when the wheel rotates. On the other hand, for more eco-friendly, the material is non-toxic and less carbon dioxide emission.

Figure 1 – E-Wheel complete assembly (Iso top left view) – Description: The commercial product include rim (700c or 26”) and 32 spoke (lacing cross 3)
Figure 2 – E-Wheel complete assembly (Iso top right view)
Figure 3 – Integrated hub (Iso top left view) – Description: IS 6-bolt disc brake, compatible with 180mm, 203 mm disc brake rotor
Figure 4 – Inside the integrated hub – Description: 3 battery packs are inside the stator of electric motor (include steel lamination and winding core. Each battery pack contains ten 18650 lithium-ion cell. My design is based on Panasonic NCR-18650A lithium-ion cell. It has the nominal capacity of 2950mAh and life charge cycle up to 1000
Figure 5 – Integrated hub skeleton structure – Description: The stability of the system is based on Y-spoke, battery mount ring and 3 lock bolts through the stator. It will fix the stator and 3 battery packs correctly
Figure 6 – E-Wheel with 5-speed freewheel

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