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Team 3: Achieving Mobility

Team 3: Achieving Mobility. Matt Last, Rob VanderVennen , Matt Rozema , Dan Evans. Outline. Project Definition Design Final Product Conclusions Questions. Introduction. Isaac Postma Spinal Muscular Atrophy Physical Limitations Current Transportation . Project Definition.

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Team 3: Achieving Mobility

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  1. Team 3: Achieving Mobility Matt Last, Rob VanderVennen, Matt Rozema, Dan Evans

  2. Outline • Project Definition • Design • Final Product • Conclusions • Questions

  3. Introduction • Isaac Postma • Spinal Muscular Atrophy • Physical Limitations • Current Transportation

  4. Project Definition • Design an electric wheelchair that the individual can control while lying down • Two operational modes: • Manual (attendant-controlled) • Electric (user-controlled) • Touchpad controlled driving system • LED system indicating possible directions • One camera and monitor for user vision

  5. Major Design Decisions • Motor control hardware topology • Feedback type • User interface • Power regulation safety • Structure affected by other component designs • Customer requests

  6. Component Design • Power regulation • Fuse • Overvoltage protection • Cooling fan • Heat sinks

  7. Component Design • Motor Control • 2 separate motor controllers • 1 electronic control unit (ECU)

  8. Component Design • Software • User Interface controlled by ECU • Directional state machine • Closed loop voltage control of motors • CAN, UART, GPIO, Timer, and Watchdog peripheral drivers provided by Stellaris

  9. Component Design • Motors • Provide necessary torque to move the wheelchair and user • Required to handle: • 450 lb maximum weight (user + stroller) • ± 5° incline/decline • 3.5 mph max speed • Minimum motor specifications to meet requirements above: • Power: 0.243 hp • Torque: 3.22 ft-lb

  10. Component Design • Brakes • Electric brakes • Controlled by software • Triggered by releasing the touch button • Mechanical brakes • Controlled by attendant pushing wheelchair • Consist of hand lever and rim brake (bicycle brake) • Parking Brakes • Lock each wheel in place • Manual lever system • Emergency Brake • Provide immediate motor stoppage during emergencies • Triggered by a simple on-off switch

  11. Component Design • Mounting • LCD • Touch Button • Camera • Brakes • Motors

  12. Component Design • Structure • Adjustable length • Storage • Material: Aluminum 6063-T6

  13. Final Design

  14. Final Design

  15. Final Product

  16. Final Product

  17. Significant Issues • Funds • Schedule • Limited manufacturing capabilities

  18. Conclusion • Interacting with an actual customer • Working with outside companies • Scheduling and budgeting • Documentation and testing • Finalist in RESNA competition

  19. Acknowledgements • Professor VanderLeest • Professor Brouwer • Carole Pettijohn (Ivanrest Church) • Russel Ramsay (Texas Instruments) • Tim Theriault (Industrial Consultant) • Greg Bush (Gentex) • Jim Nammensma (Ebling & Son)

  20. Questions?

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