Electric Motorcycle Proposal John J. Romano Carleton B. Simpson Advisor: Dr. Allen Drake 28 September 2011

Overview Problem Definition Specific Design Objectives Implementation & Goals Diagram of Design Scheme Budget Estimate Schedule / Timeline

Problem Definition Convert a gasoline powered motorcycle to electric propulsion Install 36V DC electric motor salvaged from a golf cart Power it using three 12V deep-cycle batteries Pulse-width modulation throttle control DC-to-DC converter (36V  6V)

Specific Design Objectives Convert gas-powered motorcycle to electric propulsion Safety Considerations UNH as an electric motorcycle-friendly campus Gasoline vs. Electric motorcycle performance

Convert Gas-Powered Motorcycle to Electric Propulsion Remove engine, transmission, exhaust Mount DC motor to frame, connect to rear wheel via chain drive PWM for throttle control Fabricate a steel structure to mount the batteries

Safety Considerations Maintain functionality of existing 6V electrical components o Headlight o Direction signals o Horn Perform basic maintenance to chassis o Lubricate cables o Check brakes, steering, axles, tires, etc.

UNH as an Electric Motorcycle-Friendly Campus Analyze the possibility of UNH as an electric motorcycle campus Locate possible campus electric motorcycle parking / charging stations Determine the fiscal cost to implement

Gasoline vs. Electric Motorcycle Performance Original Motorcycle Specifications: ModelHonda CB125Electric Motorcycle Year1975 Motor Type125cc Single, four-strokeEZ-GO 36V DC Power12 HP, RPM 3 HP, RPM Weight133 kg, 293 lbs (Inc. oil & gas) ~350 lbs total (~200 lbs for motor/batteries) Top Speed~65 MPH~30 MPH (Goal)

Gasoline vs. Electric Motorcycle Performance Cont. Test the performance of the completed electric motorcycle o Acceleration o Braking o Handling o Weight o Operation Range o Usability Compare results to contemporary road tests of the 1975 Honda CB125

Implementation & Goals 36V DC motor salvaged from a 1979 EZ-GO electric golf cart Remove unnecessary components (engine, transmission, exhaust, air box, fuel tank, tachometer, battery) – Approximately 150 lbs removed Strengthen frame to maintain adequate structural rigidity

Implementation & Goals Cont. Use rear wheel sprocket and a new sprocket attached to the motor for chain drive Perform maintenance Fabricate /weld a steel support structure Mount motor and batteries with accessibility in mind Install PWM and voltage regulator

Implementation & Goals Cont. 36V, 3 HP= RPM 18” rear wheel, 4.75” sprocket  3.78 ratio 2.5” motor sprocket  sprocket ratio of 0.53 Ratio of travel from motor sprocket to tire  3.78 * 0.53 = 2.00 Circumference of motor sprocket  2.5” * π = 7.85” For each motor rotation, the wheel travels  2.00 * 7.85” = 15.71” (horizontally)

Implementation & Goals Cont. Ideal Top Speed Estimation: 41.7 MPH Calculation is IDEAL, actual top speed will be less due to: – Friction / Air Resistance – Weight Speed / Acceleration Goal: 0 – 30mph in 10 sec.

Implementation & Goals Cont. Deep-Cycle Batteries (12V): 105 ah * 3 = 315 ah Total Energy of Batteries = 12V * 315 ah = 3780 watt-hours = 3.78 kW-h Motor consumes 2.24 kW At full throttle, motor could run 1.69 hours Assuming we are travelling at ideal top speed: 1.69 hours * 41.7 MPH = 70.4 miles Ideal maximum range estimation is 70.4 miles

Implementation & Goals Cont. Deep-Cycle Batteries (12V): 105 ah * 3 = 315 ah Total Energy of Batteries = 12V * 315 ah = 3780 watt-hours = 3.78 kW-h Motor consumes 2.24 kW At full throttle, motor could run 1.69 hours Assuming we are travelling at ideal top speed: 1.69 hours * 41.7 MPH = 70.4 miles Ideal maximum range estimation is 70.4 miles

Diagram of Design Scheme

Budget Estimate Part:Cost:Note: 1975 Honda CB125$0*Donated by Carleton 36V DC Motor$0*Donated by Carleton 12V Deep-Cycle Batteries (x3)$200*Possibly use those from Electric Snowmobile Pulse-Width Modulator$100 Throttle$50 DC-to-DC Converter (36V-6V)$30Ex. Ti TPS54140 Buck Converter Miscellaneous Parts$100 Total:$480

Schedule / Timeline

Schedule / Timeline Cont.

Questions, Concerns, or Advice?