Friction-Drive Power-Assist for Manual Wheelchairs
At a glance
Role: Mechanical lead—motor and transmission sizing; CAD + FEA; DFM/DFMA; safety interlock (e-stop)
Scope: Team of five • eight weeks • budget-limited prototype
Outcome: Functional assist on flat and mild inclines; smooth manual handover; tool-less install/removal
Three proof points
Architecture: Friction-drive roller with modular printed/aluminum brackets (no frame modifications)
Rigor: Torque/speed sizing and contact-pressure targets; bracket FEA for stiffness and chatter avoidance
Integration: Enclosed electronics; safety interlock (e-stop); simple state logic for safe engagement
Walking-speed power-assist that preserves manual control—no frame modifications, serviceable design.
Prototype in use