wheelchair power assist
Post on 22-Feb-2016
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Wheelchair Power Assist
Michael BowmanTeam 28
OverviewIntroductionProject ObjectivesFunctional DiagramSimilar Products including Market AnalysisProject SpecificationsSystem Block DiagramGantt ChartCost Analysis
Henry W. Owen SchoolChelsea, Massachusetts
Consultants:Client: James
Disorder: Degenerative Muscle disease
Contact: Bob Wierzbicki
Client Request
Due to muscle weakness caused by the
client’s disease, he needs a way to add extra
force when moving his wheelchair, allowing
him to move around on his own.
Project Objectives Power Assist add-on to retro-fit existing
wheelchair
Easy-to-use controller for assist adjustments or total control
Easy removal of Power Assist device
Functional Diagram
(diagram courtesy of Yamaha JXW-1)
Similar Products Quickie Xtender Power Assist Sunrise Medical List Price: $6,295
Similar Products e-motion M15 Frank Mobility Systems List Price: $7,675
Market Analysis 2002 US Census Data :
2.8 million US citizens required a wheelchair*
93% of wheelchair users used manual wheelchairs*
Electric wheelchairs can range from $4000 to $15,000+, while manual wheelchairs cost in the hundreds of dollars
* Americans with Disabilities: 2002 Current Population Report P70-107
Project Specifications
Two 12V 12A batteries
Two 24V 120W motors
Purchased/Designed Motor Controller
Designed attachment at wheel hub
Designed User Controller
System Block Diagram
Gantt Chart
Gantt ChartTasks and Subtasks
Cost Analysis – Component Cost
Amstron AP-12120F2 12V/12A battery (2) - $35 each
Sabertooth Dual 12A 6V-24V R / C Regenerative Motor Driver - $65
24V brush motor kit (2)- $200 each
PICkit Microcontroller - $50
Various materials needed for controller- $100
Cost Analysis – Total CostComponent Cost:
(determined from previous page)-- $685
Direct Labor:(determined using the formula $30.28/hr x 15 hrs/week x 20 weeks)-- $9,084
Overhead:(determined by 51% of direct labor)-- $4,632.84
Total Cost:Direct Labor =
$9,084.00 +
Overhead = $4,634.84
+Component Cost = $685_____________________________
Total Cost = $14,401.84
Questions?
Sources http://www.rehabmart.sg/Wheelchairs/Motorized%20Wheelchairs/Yamaha%20JWX-1.pdf http://www.newdisability.com/wheelchairstatistics.htm http://www.census.gov/hhes/www/disability/sipp/disab02/awd02.html http://search.atbatt.com/search?asug=&w=12V&x=0&y=0 http://www.atbatt.com/product/20766/sla/amstron/12v-12ah/battery http://www.thesuperkids.com/scmococoki.html http://
www.allegromedical.com/mobility-scooters-c533/quickie-xtender-power-assist-p189918.html?engine=froogle&utm_source=froogle&utm_medium=feed&CS_003=9164468&CS_010=8ab281020bb66dff010bb679f2d02029&gdftrk=gdfV21244_a_7c477_a_7c4637_a_7c189918
http://www.frankmobility.com/
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