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A Novel Foot Power Generator. EE4013 Presented by: Paul Lennox Martin Robichaud Supervised by: Dr. Sharaf. Presentation Layout. Summary History & Background Moving Platform Generator Charging Circuit & Source Future Recommendations Questions. Summary.

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a novel foot power generator

A Novel Foot Power Generator

EE4013 Presented by:

Paul Lennox

Martin Robichaud

Supervised by:

Dr. Sharaf

presentation layout
Presentation Layout
  • Summary
  • History & Background
  • Moving Platform
  • Generator
  • Charging Circuit & Source
  • Future Recommendations
  • Questions
summary
Summary
  • Purpose is to generate electrical energy from a foot step.

Courtesy: www.3dcharacter.com

history background
History & Background
  • Our project is based on a foot generator designed by a group of 2nd year mechanical engineering students.
  • Foot platform had already been assembled.
  • A DC generator was their method of producing electrical energy.
platform generator
Platform & Generator

Courtesy: Floor Generator manual, ME2332, Winter 2004

functional diagram
Functional Diagram
  • Generator
  • Charger circuit
  • Source
  • Utility circuit
moving platform
Moving Platform
  • Redesign or Reuse
  • Tested the prototype design with pre-established requirements
  • We decided to build our own
moving platform design
Goals: 15 mm displacement and sturdyMoving Platform Design

Red = Frame

Welding Design

Green = Moving Platform

moving platform construction
Moving Platform Construction
  • The frame was welded by Mr. Oscar Robichaud.
  • The main construction was performed by Paul and I.
generator
Generator
  • Three methods were suggested by our advisor.
  • Piezoelectric ceramics
  • DC generators
  • Variable reluctance coils
    • Secondary generator
dc generator design
DC Generator Design
  • Decision: DC Generator
  • Two main concerns:
    • Gear Ratio
    • Total Voltage Rating of 9V
  • Restrictions:
    • Small Linear Vertical Movement
    • Upward and Downward Motion
dc generator 1
DC Generator 1
  • Tamiya 72005 6-Speed Gearbox
  • Specifications:
    • RPM: 5040-6300
    • Rated: 3V
    • Amperage: 0.64A
dc generator 2
DC Generator 2
  • Tamiya 70097 Twin-Motor Gearbox
  • Specifications:
    • RPM: 6990-9100
    • Rated: 3V
    • Amperage: 0.66A
generator mechanisms
Generator Mechanisms
  • 3 Attempted Mechanisms
    • Air Pressure
    • Mechanical Arm
    • Mechanical Arm + One-Way Bearing
mechanical arm design
Mechanical Arm Design
  • Objectives:
    • Increase Linear Motion
    • Interact with Shaft
    • Easy to adjust

Red = Frame

Green = Moving Platform

mechanical arm
Mechanical Arm
  • Problems:
    • Quick change in direction, hard on gears
    • Change in direction of current, requires H-Bridge
    • Unusable voltage in the upward motion
    • Counterweights required due to motor torque
one way bearing
One-Way Bearing
  • Solution: Add a one-way bearing
  • Benefits:
    • Eliminate H-Bridge requirement
    • Decrease Plate Resistance
    • Easier on Gears
generator results
Generator Results
  • We do not have a digital photo of the output yet. The output current and maximum power will also be noted. Tuesday afternoon.
  • Currently between 7-8Vpeak per step
generator results21
Generator Results
  • Peak Voltage = 8.20 Volts
generator results22
Generator Results
  • Max Current = 1.20A
  • Max Power = 9.84W
  • Assumptions for plot:
    • Constant Velocity
    • No time delay from plate movement to generator output
charging circuit source
Charging Circuit & Source
  • Two methods were suggested by our advisor.
  • Sealed lead gel batteries
    • Not Expensive(5$)
    • Requires Charging Circuit
  • Super capacitor
    • Expensive(100$+)
    • No Charging Circuit Required
sealed lead gel battery
Sealed Lead Gel Battery
  • Specifications:
    • 6V, 4Amp-Hours
    • Charging Voltage
    • 6.7-7.3 Volts
charging circuit result
Charging Circuit Result
  • 1.10 Voltage drop across the regulator
charging circuit modification
Charging Circuit Modification
  • Voltage Regulator LM317T will be replaced
  • An LDO Voltage Regulator, LM1117 will be used in its place
  • Expected results:
    • 0.5 Volt drop across the Voltage Regulator, instead of the current 2.0 Volt drop
future recommendations
Future Recommendations
  • Generator:
    • Piezoelectric Ceramics
    • Variable reluctance coils
  • Source:
    • Super Capacitor
piezoelectric generator
Piezoelectric Generator
  • Benefits:
    • Implementation
    • Pressure Dependant
    • Reliability/Durability
conclusion
Conclusion
  • Our prototype demonstrates that a floor generator can be done
  • A DC generator can illustrate the concept, but the reliability and durability are questionable
  • Methods to increase output Power:
    • Increase Displacement
    • Increase Applied Force