Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Zöe Drivetrain & Wheels Life in the Atacama Design Review December 19, 2003 Stuart.

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Presentation transcript:

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Zöe Drivetrain & Wheels Life in the Atacama Design Review December 19, 2003 Stuart Heys & Dan Villa

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Description and Motivation Improve upon existing Hyperion drivetrain Less backlash (no chains) Higher efficiency (w.r.t. packaging as well as power) Higher torque capacity Higher top speed Smaller part count (improved reliability) More appropriate wheel selection Optimized interface to drivetrain Wider contact patch for soft soils

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Current Design Match motor/drive as closely as possible to speed and voltage requirements Custom wound motor Efficient, high torque capacity harmonic drive gearing Compact, lightweight thin section output bearings with reliable seals Entire drive assembly environmentally isolated

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Drivetrain Packaging Complete drive system contained within axle Concealed wiring Sealed motor and gearing

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Single Wheel Testbed Single wheel testbed created to qualify drivetrain and wheel options Power data used to confirm new motor selection 3 Wheels tested Existing Hyperion bicycle wheel (26x1.75”) Motorcycle wheel (28x3”) Large diameter bicycle wheel (27.5x3”) Drivetrain to be prototyped and endurance tested early 2004

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Initial Wheel Tests

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Closing in on Zoe Wheel…

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Recommendations 24” bicycle rim with 3” wide tire combined with custom machined hub Slightly smaller in diameter than Hyperion wheel Custom hub allows for optimized wheel mounting Low weight Short integration time Simple, reliable solution Further testing to be done with mock-up of new drive system on single wheel testbed (new wheel, motor, gearing, amp) 100km endurance test to insure reliability Custom wheel designs may be considered if time allows