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Scooter Presentation

Date post: 18-Jul-2015
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The Minnow
Transcript
Page 1: Scooter Presentation

The Minnow

Page 2: Scooter Presentation

HOW IT’S USED

Page 3: Scooter Presentation

HOW IT’S USED

Page 4: Scooter Presentation

FOLDING HANDLEBARS

Page 5: Scooter Presentation

FOLDING HANDLEBARS

Page 6: Scooter Presentation

FOLDING HANDLEBARS

Tabs for correct handlebar orientation

Page 7: Scooter Presentation

FOLDING HANDLEBAR STEM

Thumbscrew

Wedge shape to avoid over rotating

Page 8: Scooter Presentation

FOLDING REAR WHEEL

Pivot lock

Pull both pivot locks outward to disengage pins

Page 9: Scooter Presentation

FOLDING REAR WHEEL

Split electronics housing to allow wheel collapse

Page 10: Scooter Presentation

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

Page 11: Scooter Presentation

INTERNAL WIRING

Page 12: Scooter Presentation

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

Page 13: Scooter Presentation

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

Page 14: Scooter Presentation

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

Page 15: Scooter Presentation

ASSEMBLY COST

Page 16: Scooter Presentation

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.

Page 17: Scooter Presentation

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

Page 18: Scooter Presentation

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.

Page 19: Scooter Presentation

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.

Page 20: Scooter Presentation

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

Page 21: Scooter Presentation

ELECTRICAL SYSTEMS

Page 22: Scooter Presentation

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


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