Post on 14-Dec-2015
transcript
Electric Motorcycle Design Project
SR. Design Project Fall 2008-Spring 2009
Justin ColeChad Dickman
Todd SandersonKris Williams
Outline• The project• Components• Where we stand• Budget• Sample Calculations• Data Tables• Graphs• Timeline• What’s Next?• Conclusion
The project
• Convert gasoline motorcycle to electric– Emissions – Energy crisis– Ideal for short
commutes.
• Create publicity for the school.– Outreach– Open house
Components
• Batteries– 4-12VDC sealed lead
acid– Designed for electric
vehicles.– electricmotorsport.com
• Charger– Soneil 48 V 5 amp – thunderstruck-ev.com
Components (continued)
• Motor– Briggs and Stratton Etek-R
• 8 hp continuous• 15 hp peak
• Controller– Sevcon Milipack– Regenerative– 48VDC
• Wiring, fuses, throttle• electricmotorsport.com
Where we stand
• Motor kit & Batteries Purchased and received – electricmotorsport.com
• Purchased motorcycle– Lemon and Barrett’s
• Still need parts– Chain– Sprockets– Charger– Miscellaneous
Budget48 volt System Budget Breakdown
Item Price SupplierBike $250.00 Lemon and Barrett’sKit(which includes the following): $1,075.00 electricmotorsport.com
motorcontroller
throttlecontactor
fuseswiring
Charger $175.00 thunderstruck-ev.com4 Batteries @ $70 $280.00 electricmotorsport.comChain $100.00 electricmotorsport.comGears $200.00 electricmotorsport.comGeneral Costs $300.00 subtotal $2,380.00 Taxes $142.80 Total $2,522.80
Table of budget breakdown
Sample CalculationsAerodynamic Drag Force (Fd):
Cd= Coefficient of drag of the vehicle
A= Frontal area of the vehicle in square feetV= The vehicle’s speed in mph
Rolling Resistance (Fr):
Cr= Rolling resistance factor
W= Vehicle weight in lbs
Force due to Acceleration (Fa):Ci= Unit conversion factorW= Vehicle weight in lbsa= Acceleration in mph/second
Force due to Climbing Hills (Fh):
W= Vehicle weight in lbsΦ= Angle of incline
Fd
Cd A V2
391
Fr Cr W
Fa Ci W a
Fh W sin ( )
Sample Calculation (continued)Total Force on the Vehicle (FT):
All four forces added together
The Horsepower needed (hp):FT= Total Force in lbs
V= Speed expressed in mph
Torque needed from the Motor (T):hp= HorsepowerRPM= Revolutions per minute
FT Fd Fr Fa Fh
hpFT V
375
T5252hp
RPM
Conversion from hp to Watts (W):
Whp 1000
1.34
Current needed to Power in Amps(A):V= Volts from the batteryW= Power need to run in Watts
AW
V
Sample Calculations (continued)Time in hours the Vehicle can run (Time):
Ah= Amp-hours from the batteryA= Current
Total Distance in Miles Vehicle can Drive (D):mph= Speed in mphTime= Time in hours vehicle can run
Battery Charging Time (Tc):
Ah= Amp-hours from the batteryAmp= Amps from the battery charger
TimeAh
A
Dmph
Time
TcAh
Amp
Data TablesSpeed Force
mph AerodynamicRolling
ResistanceWind
ResistanceAcceleration Resistance
Hill Climb Total
5 0.128 7.320 0 69.365 14.63 91.446
10 0.512 7.320 0 69.365 14.63 91.830
15 1.151 7.320 0 69.365 14.63 92.469
20 2.046 7.320 0 69.365 14.63 93.364
25 3.197 7.320 0 69.365 14.63 94.515
30 4.604 7.320 0 69.365 14.63 95.922
35 6.266 7.320 0 69.365 14.63 97.584
40 8.184 7.320 0 69.365 14.63 99.502
Table of various resistive forces with a constant acceleration of 3 mph/sec and a 3% grade.
Data Table (continued)Speed Acceleration Force Total Power Torque Current Time Distance
RPM mph mph/sec lbs HP W ft*lbs Amps Hrs min Miles
2830.6 40 1 30.57 3.26 2433.40 6.05 50.70 0.69 41.42 27.62
2830.6 40 2 53.69 5.73 4273.93 10.63 89.04 0.39 23.58 15.72
2830.6 40 3 76.81 8.19 6114.46 15.20 127.38 0.27 16.49 10.99
2830.6 40 4 99.93 10.66 7954.99 19.78 165.73 0.21 12.67 8.45
2830.6 40 5 123.06 13.13 9795.52 24.35 204.07 0.17 10.29 6.86
Table of Distance and other parameters with varying accelerations
Data Tables (continued)Speed
Grade of Incline
Force Total Power Torque Current Distance
MPH % lbs HP W ft*lbs Amps Miles
40 1 20.38 2.17 1622.59 4.03 33.80 41.42
40 2 25.26 2.69 2010.91 5.00 41.89 33.42
40 3 30.14 3.21 2399.00 5.96 49.98 28.01
40 4 35.01 3.73 2786.74 6.93 58.06 24.11
40 5 39.87 4.25 3174.01 7.89 66.13 21.17
40 6 44.73 4.77 3560.71 8.85 74.18 18.87
40 7 49.58 5.29 3946.72 9.81 82.22 17.03
Table of Distance and other parameters with varying inclines
Data Tables (continued)
Table of distance with a period of acceleration followed by a period of constant speed.
Accelerating at 4 mph/sec
Accelerating to 40 mph
Total KWh from the batteries
KW needed for
accelerating at 4mph/sec
Accelerating Time in Hours (30 stop and
go's)
KWh used when accelerating at 4
mph/sec for a total of 5 min worth of
accelerating
Distance traveled
accelerating
0 to 5
1.00674668
0.599 0.01 0.01 0.05
5 to 10 1.801 0.01 0.02 0.10
10 to 15 3.014 0.01 0.03 0.16
15 to 20 4.246 0.01 0.04 0.21
20 to 25 5.505 0.01 0.06 0.26
25 to 30 6.798 0.01 0.07 0.31
30 to 35 8.134 0.01 0.08 0.36
35 to 40 9.518 0.01 0.10 0.42
Total KWh used
accelerating
Remaining KWh
Hours of constant
speed
Distance traveled in miles
after Accelerating at
40 mph
Distance traveled accelerating
(miles)
Total Distance
traveled in miles
0.41 0.59 0.44 17.56 1.88 19.43
Graphs
Graphs (continued)
Previous Designs
• Very similar – Motor– Batteries– Type of bike
• Verified project calculations
• Made in home garage.• Proves feasibility• Total project costs less
than $3000Picture of bike that uses the same motor and
type of batteries as this project.
Current Timeline Electric Bike Conversion Gantt Chart Timeline
October November January February March April May
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1
Research
Budget
Calculations
Design of
Bike Specs
Design of Bike Layout
Writing Sponsorship Proposal
Presenting to Companies
Purchasing the Bike
Buy Batteries
Build Batt. Trays
Buy Electric Motor Kit
Drive train Assembly
Motor Mount
Electric Assembly
Testing
Demo
What’s Next?
• Bike preparations• Layout of components• Bike Design• Assembly • Wiring• Testing• Demonstrations
Conclusions
• The design is feasible• Some minor funding is still needed• The project is coming along pretty well
according to the plan.• The preliminary research and calculations are
complete.• The bike is ready to begin laying out the
components.