human generated power for b9 better water maker
DESCRIPTION
Human Generated Power for B9 Better Water Maker. P13417. Introduction to the Team. Table of Contents. Project Overview Problem Statement Customer Needs Specifications Current Design Testing Preliminary Concepts Concept Selection Conclusions. Project Overview. B9 Plastics: - PowerPoint PPT PresentationTRANSCRIPT
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Human Generated Power for B9 Better Water MakerP13417
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Introduction to the Team
Team Members:
Kreag Bradley ISE
Diane Kang ISE
Emily Belonga ME
Nicholas Higgins ME
Jordan Lahanas EE
Trang Pham EE
Guides:
Vincent Burolla
Leo Farnand
Customer:
B9 Plastics
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Table of Contents• Project Overview• Problem Statement• Customer Needs• Specifications• Current Design• Testing• Preliminary Concepts• Concept Selection• Conclusions
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Project Overview• B9 Plastics:
A not for profit organization dedicated to social and environmental improvement through the use of certain materials (plastics).
• Better Water Maker (BWM):A water treatment device used in the developing world to kill water microbes by using ultraviolet light. The device uses a human powered crank to generate power for the device at 12v.
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Problem Statement• Our project, in conjunction with B9 plastics, is to redesign the
power generator to ease the use of this device for women and children. The current design seems to be too physically demanding to maintain the proper power output for the time required to cleanse a moderate amount of water (over 1 gallon).
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Customer Needs
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Specifications
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V02 Testing
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Current Design
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Current BOM
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Current BOM
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Preliminary Concepts
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Concept Selection• New Gear Box
• To obtain better gear ratio • Maintain/reuse all electrical work • Motors still experience same input rpms
• New Motors• To obtain better gear ratio• Ease cost• Reduce losses due to friction • Significant increase in total lifetime
Goal: Each proposal is to decrease input crank rpms
*Both proposals include using legs/feet to pedal generator
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Maximum allowable leg force required to power generator
• Current generator requires 50in*lbs of torque to maintain required rpms
• Equates to 9 lbf at crank arm handle which is 40% of maximum arm force of women (21 lbf)
• Maximum leg force of average woman is 63 lbf
• Allowable force = 40% of 63 lbf
• 25 lbf experienced at crank arm handle (pedal)
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New Gear Box Comparison
Current New Gear Box Design
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New Gear Box
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Torque Equations
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Basic Stress and Deflection Analysis of Crank Arm
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Current Design
Type: Apply normal forceValue: 4.11 lbf
Ultimate Strength of “Harbec plastic” is 10,700psi
• Large Gear with 9 lbf applied to crank handle
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Proposed Design• Large Gear with 25 lbf applied to crank handle
(pedal)
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Current Crank Arm• 9 lbf applied
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Current Crank Arm• 25 lbf applied
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Gear Small Radius• 25 lbf applied to crank arm pedal
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Proposed Gear Box
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Proposed Generator Cover
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Proposed Generator Cover DRW
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Proposed Motor Mount Box
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Proposed Motor Mount Box DRW
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Proposed New Gear (Small Radius) DRW
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Proposed New Gear (Large Radius) DRW
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Proposed Steel Axle DRW
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Proposed Crank Arm Pedal DRW
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New Gear Box
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Current Motor• Mabuchi RS-555PC• Short lifetime
• <6000 hours
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Mabuchi RS-555PC
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New Motor• CF Motor RS-390PH
• Brushed motor• Longer lifetime• More efficient
• 4 of these motors in a configuration with 2 parallel • Desired voltage/power of 12 V/17 W • Desired RPMs of ~1650
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Proposed Changes• Reverse diode across inductor
• Incentive: circuit integrity• Currently the circuit contains an inductor near the input that has
no alternative current path, should the transistor in series with it turn off
• Adding a reverse diode in parallel with this inductor ensures a discharge path for this current
• Replacement of potentiometer by low tolerance resistors • Incentive: cost• The current circuit uses an op-amp comparator and a 5V
reference to control powering of a power LED • This LED turns on when a sufficient voltage is generated (>12 V)
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Pump Circuit• Existing Pump Circuit
• Accepts a variable input voltage• 12 V/19 W required to power the ballast and pump • After 10 seconds, pump will activate, moves water through device
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Proposed Changes• Smoothing RC network (“electrical flywheel”)
• Incentive: efficiency, easiness of use• Add smoothing smoothing RC network for charge storage • The time allowed for not cranking the generator and keeping the
pump on was decided to be 1.0 seconds • Time constant
• This time constant can be achieved with a 100 µF effective capacitance and a 135 kΩ effective resistance.
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Motor Alternative BOM
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Motor Alternative BOM
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Seat Design Proposal• Preliminary concepts:
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Proposed Seating Position Assembly
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Proposed Seating Position Assembly (Hidden Lines View)
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Proposed Plywood Insert Geometry DRW
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Proposed Seat Back Rest DRW
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Proposed Bucket Seat DRW
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Entire proposed gearbox and seat modification
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Conclusion• New Gear box requires major tool changes
• Adds expense• New motors requires less tool changes
• Less expensive• Overall more efficient