Presents the ‘Easy-Bike’ Trevor Hennigar Hector MacQuarrie Paul Thompson David Smith (Absent) Supervisor: Peter Allen

Background Information

Problem to Be Solved Difficult to traverse steep hills in Halifax on a bicycle Inability to store energy while stopped temporarily in city traffic or on a ferry Lack of storage space for a bicycle and an exercise bike in small dwellings 3 Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Design Requirements

1.Combination of motors, generators and batteries 2.Capable of regenerative braking 3.Ability to be pedaled while at a standstill in order to further charge batteries 4.Ability to be charged using a standard household power supply 5.Minimum range of 10km 6.Maximum weight of 90 lbs 7.Maximum cost of $ Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Calculations

7 Power Requirment Maximum Power Calculation: θ = 8.5° (Prince Street) V = 1.67 m/s (6km/h) (Minimum speed can travel with stability) n = 5% (Chain + Bearings + Safety Factor) P = Watts (Power required for motor to deliver) Background Information Design Requirements Calculations DesignBudgetFutureConclusion

8 Energy Storage P Hill = W, t = 4.0 min P flat = 64.5 W, t = 28.9 min η=25% (Motor + Battery + Controller + I 2 R Losses) E = 71.5 Wh Electric Charge = Energy/Voltage [Ah] = [Wh]/[V] Electric Charge = 71.5Wh/36V = 2.0 Ah Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Design

Number of Wheels 10 Criteria3 Wheeled2 Wheeled Ease of OperationX Simplicity of DesignX CostX WeightX ManeuverabilityX Adaptability to Existing Bicycles X Equipment MountingX Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Drive System All Electric Drive Uses a Battery, Brushless DC Generator, and Brushless DC Motor No mechanical connection to the rear wheel 11 Generator Battery Brushless DC Motor Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Drive System Electric/Chain Drive Uses a standard bicycle drive train and a second chain drive for the generator Generator chain will be attached to the non- drive side of the bottom bracket 12 Generator Background Information Design Requirements Calculations DesignBudgetFutureConclusion Battery Brushless DC Motor

Drive System Neutral Gear Allows user to switch the easy bike into generation mode Nylon material with low coefficient of friction Replaces top two sprockets on rear cassette Dimensions must be optimized for gear shifting performance 13 Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Drive System 14 CriteriaElectric Drive Electric/ Mechanical Drive Ease of Operation X Simplicity of Design X Cost X WeightX EfficiencyX Adaptability to Existing Bicycles X ReliabilityX Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Battery 3 Types Lithium-Ion, Lead Acid, Ni-CAD 15 Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Kickstand Center Mounted Motorcycle style center stand Rear Mounted Can be retracted into a latch mechanism on the rack Out of the way while in the latched position Mock-Up tested for stability 16 Background Information Design Requirements Calculations DesignBudgetFutureConclusion

KickStand 17 INSERT sOLID WORKS MODEL CriteriaCenter Mounted Rear Mounted StabilityX Ease of OperationX Simplicity of DesignX CostX WeightX StrengthX AdaptabilityX Interference with Pedals and Steering X Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Other Items 18 Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Budget

ItemDetailsItem Cost Number of ItemTotal Cost Bicycle Frame, Gearset, and Wheels (Kijiji) $ RackNorco Axiom (JensonUSA) $ Motor Electric Hub Motor & ThrottleCrystalyte 406, 26" 36V Front Wheel (ebikes) $ Controller100A - 36V Brushless w/ Regen (Kelly) $ Battery36V 12Ah Nexcell NiMH (ebikes) $ Generator 180W 24V BLDC (AnaheimAutomation) $ ControllerDC 20-50V (AnaheimAutomation) $ Sprocket, Crankset & Chain GuardShimano Alivio (JensonUSA) $ Free Spinning DiscNylon (K-Mac-Plastics) $ Kickstand Rachet & Pawl(McMaster Carr) $ $ Pulley & Cable(McMaster Carr) $ Axle, Bearings & Spacer(JensonUSA) $ Brake Lever(JensonUSA) $ Materials Aluminum Sheet2'x1'x3/8" (Metals Depot) $ Aluminum Block1.75"x1.75"x6" (Metals Depot) $ Square Aluminum Tube3/4"x3/4"x6' (Metals Depot) $ Nuts & Bolts9/16" (Various) $ $ 5.00 Miscellaneous Battery Charger36V 3A NiMH Battery Charger (ebikes) $ Total w/10% Contingency = $ Budget Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Future Work

Gantt Chart FIX TIMELINE!!!!!!! Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Conclusions

Work Completed Design achieved which satisfies all design requirements Chassis Design/Layout Energy Calculations completed Generator Sizing Motor Sizing Battery Sizing Mock-Up Kickstand completed SolidWorks model completed 81% of proposed budget was approved Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Work Left to Do Budget Cut costs by: $ to meet design requirements $ to meet funding allotment Mechanical Finalize profile of nylon cog through trial testing Complete detailed stress calculations to confirm initial stress estimates Electrical Finalize the specifications for the generator Finalize parameters needed to program the controller Determine the possibility of using the one controller for the motor and generator Background Information Design Requirements Calculations DesignBudgetFutureConclusion

Acknowledgements Peter Allen – Supervisor Shell – Sponsor Mechanical Engineering Faculty - Support