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THE ELECTRIC BICYCLE PROJECT INCLUDING AN INVESTIGATION OF HUMAN CYCLING PERFORMANCE. S. I. Brand, N. Ertugrul and W.L. Soong University of Adelaide School of Electrical and Electronic Engineering Adelaide, Australia. INTRODUCTION. BENEFITS OF ELECTRIC BICYCLES CLEAN QUIET EFFICIENT
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THE ELECTRIC BICYCLE PROJECT INCLUDING AN INVESTIGATION OF HUMAN CYCLING PERFORMANCE S. I. Brand, N. Ertugrul and W.L. Soong University of Adelaide School of Electrical and Electronic Engineering Adelaide, Australia
INTRODUCTION • BENEFITS OF ELECTRIC BICYCLES • CLEAN • QUIET • EFFICIENT • ECONOMICAL • REDUCED TRAFFIC CONGESTION PROJECT SCOPE • DETERMINE HUMAN POWER FROM • Stationary Tests and Mobile Tests • DESIGN AND BUILD CUSTOM HUB • INVESTIGATE BATTERY OPTIONS • DEVELOP CONTROL SYSTEM
HOW MUCH POWER? A Horsepower = 746 Watts How much is a “Human Power”? CYCLING POWER DATA • ATHLETE TIME TRIALS (A.I.S.) • STATIONARY DYNAMOMETER TESTS • MOBILE CYCLING TESTS
MEASURED PARAMETERS • DYNAMOMETER • WHEEL SPEED • PEDALLING TORQUE • OUTPUT CURRENT • OUTPUT VOLTAGE • MOBILE DATA LOGGING SYSTEM • WHEEL SPEED • PEDALLING TORQUE • GEAR RATIO
DATA LOGGING SYSTEMS • STATIONARY TESTING • LABVIEW SOFTWARE • DESKTOP COMPUTER • DAQ CARD • MOBILE TESTING • VISUAL DESIGNER SOFTWARE • DATA SAMPLING HARDWARE • LAPTOP COMPUTER
PEAK CYCLIST POWER SUSTAINED CYCLING POWER
MOBILE DATA RESULTS MOTOR POWER
HORSE AND HUMAN POWER COMPARISON BICYCLE POWER REQUIREMENTS • 450 WATTS PEAK • 200 WATTS CONTINUOUS
160 WATT-HOURS WILL PROVIDE • 25 MINUTE POWERED RANGE • 50 MINUTE PEDAL ASSIST RANGE BATTERY ENERGY DENSITY
WASHING MACHINE MOTOR WOODEN MOCK-UP MACHINING ALUMINIUM FRONT WHEEL MOTOR DEVELOPMENT
MOTOR EFFICIENCY BRUSHLESS MOTOR - DC MOTOR DYNAMOMETER
CONTROL SYSTEM 3-PHASE BRIDGE INVERTER BOARD
MICROCONTROLLER and PROGRAMMING • MICROCHIP PIC16F877 • 14 BIT CORE • 20MHz • 33 INPUT/OUTPUT PINS • 8 ANALOG INPUTS • MICROCHIP RESOURCES • PIC MICROCONTROLLERS • MPLAB SOFTWARE • PRODUCT DATA SHEETS • APPLICATION NOTES • C – COMPILER • CHIP PROGRAMMER
MOTOR WAVEFORMS • 100% PWM 40% PWM
CONCLUSIONS and FUTURE WORK • DIRECT DRIVE HUB MOTOR • EFFICIENT (84%) AND LOW MAINTENANCE • BICYCLE POWER REQUIREMENTS • 200 WATT CONTINUOUS, 450 WATT PEAK • BATTERY CAPACITY • 160 WATT-HOUR • USER INTERFACE • LCD DISPLAY and KEYPAD • INPUT - CUSTOMISED RIDER SETTINGS • OUTPUT - SPEED, DISTANCE AND BATTERY STATE • CUSTOM BUILT MOTOR • RARE EARTH MAGNET ROTOR • INCREASE EFFICIENCY • REDUCED WIEGHT