scooter presentation
TRANSCRIPT
The Minnow
HOW IT’S USED
HOW IT’S USED
FOLDING HANDLEBARS
FOLDING HANDLEBARS
FOLDING HANDLEBARS
Tabs for correct handlebar orientation
FOLDING HANDLEBAR STEM
Thumbscrew
Wedge shape to avoid over rotating
FOLDING REAR WHEEL
Pivot lock
Pull both pivot locks outward to disengage pins
FOLDING REAR WHEEL
Split electronics housing to allow wheel collapse
SPRING LOADED DECK PLATE
Spring
• Spring keeps deck plate secure while the scooter is being carried
• Hinge is wedge shaped to prevent deck plate from being over rotated
INTERNAL WIRING
Materials and fabrication • Frame
Chassis
Materials: 6061-T6 Aluminum
Fabrication: Abrasive Water Jetting, Bending, Welding
Neck & Collar
Material: 356 & 6061-T6 Aluminum
Fabrication: Cutting, Grooving, Casting, Welding
• Handlebar fork
Material: 6061-T6 Aluminum
Fabrication: Cutting, Bending, Milling, Drilling, Turning, Welding
Materials and fabrication • Upper Connector
Material: 356 Aluminum
Fabrication: Casting
• Pivot Joint
Material: 356 Aluminum
Fabrication: Casting, Drilling
• Deck Plate
Material: 6061-T6 Aluminum
Fabrication: Abrasive Water Jetting
Materials and fabrication
• Wheel Guard
Material: ABS Plastic
Fabrication: Plastic Injection Molding
• Rear Pivot Locks
Material: ASTM A36 Cast Carbon Steel
Fabrication: Casting
• Electronics Housing
Material: ABS Plastic
Fabrication: Plastic Injection Molding
ASSEMBLY COST
Performance
Performance Metric Value
Stall Force (per motor)
33 lbf
Operation Force (per motor)
14.7 lbf
Acceleration 3.89 ft/s^2
Acceleration Time 5.65 seconds
Runtime 56.3 min
• All calculations done using a
• Scooter mass of 23 𝑙𝑏𝑚
• Rider mass of 220 𝑙𝑏𝑚
• Motor specifications were from the manufacturer.
• Two brushless hub motors were used in the design of the Minnow.
Maximum Grade
• Raz0r e-300 (on-the-market competitor) can handle:
• Incline of 2.88 degrees
• Grade of 3.2%
• The Minnow can handle:
• Incline of 14.32 degrees
• Grade of 15.9%
𝐹 = 0
𝑠𝑖𝑛 𝜃 + 𝜇𝑐𝑜𝑠 𝜃 =2𝐹
𝑚𝑔
Brake Performance
Performance Metric Value
Brake Force 325.9 lbf
Brake Time 0.51 seconds
Brake Acceleration -43.12 ft/s^2
Braking Distance 5.61 ft
• The Minnow uses a 3.15 inch band brake
• Actuation force calculated from 60% of the average max grip strength of a 18-29 year old.
Finite Element Analysis • All parts underwent Finite Element
Analysis (FEA) in SolidWorks as they were designed.
• Each part is designed to have a minimum factor of safety of 3.
Thermal Analysis
• Motor Analysis
• Temperature increase of 0.6 °𝐹 in the motor during acceleration from zero to max speed of 22 𝑓𝑡
𝑠
• Brake Analysis
• Temperature increase of 47.5 °𝐹
• Assumes worst cases:
• No heat is transferred while braking
• Force applied instantaneously
ELECTRICAL SYSTEMS
COST
Cost Category Cost
Direct Costs -
Manufactured Parts $102.50
Commercial (off the shelf) $315.03
Assembly (direct labor) $9.16
Total Direct Costs $426.69
Indirect Costs $213.35
Total $640.04
Sales Price $1,299.00