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Team 8 : Batteries Not Included
Dave Dickinsheets
Matt Scholten
David Qu
Knoa Knapper
Presentation Outline
Project Re-introduction
Design Process
Major Obstacles
Major Accomplishments
Next Steps
Battery-free Tire Pressure Monitoring System
Project Re-Introduction
Design Process
Utilized feasibility calculations/physics resources Number of wraps on coil Coil diameter Magnet Orientation
Tested theories on test apparatus Adjusted design accordingly
Major Obstacles Magnet Orientation
Proper orientation gives higher voltage Proper orientation reduces the number of
magnets necessary Coil Design/Manufacturing
Compact coils Working coils
Mounting
Major Accomplishments
Working test apparatus
Major Accomplishments
Magnet Mounting Bracket Design
Caliper
Magnet
ThreadedHeightAdjustment
Caliper Mounting Holes
Major Accomplishments
Voltage Generation3 Volts at ~25 mph
6 Volts at ~60 mph
4.5 Volts at ~42 mph
7.5 Volts at ~75 mph
All voltages are half wave heights
All speeds are simulated on test apparatus without a tire mounted
Readings taken at 5 V/division on Y-axis 5 ms/division on X-axis
Major Accomplishments
Circuit Design Tested Half Wave Rectifier Requires Voltage Regulator
Magnet Orientation Coil Design Improved Purchased TPMS System Budget Under Control
Next Steps
Refine magnet and coil size Refine circuit design Mounting design for coil and circuit Magnet bracket construction Develop TPMS testing method
Questions?