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/