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Unread 10-10-2017, 12:07 AM
RBY1577 RBY1577 is offline
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Electric Wheelchair Kit - FRC Team Steampunk 1577

Typical electric wheelchairs usually cost around 2,500$, and while it could turn around the life of whoever needs it, not everyone can justify spending such a grand amount of money, and are left stuck with rented wheelchairs. Our kit connects to standard rented wheelchairs without damaging them at that slightest and makes them mobile in a simplistic manner, for a fraction of the price, around 500$.

While every part of our kit can be bought separately, and be assembled using the tools in your disposal and a 3D printer, this kit has the added bonus of being comprised of parts which are abundant with every FRC team worldwide, meaning your local FRC team would be able to assemble your newly fashioned wheelchair.

Video Link:
https://www.youtube.com/watch?v=bUUqksXlocs
Or
https://vimeo.com/237568756
PDF Assembly Link: https://drive.google.com/file/d/0BwP...ew?usp=sharing
Pastebin Code: https://pastebin.com/X6vgVXNe
CAD Files: https://drive.google.com/open?id=0Bz...0phWTk4ZXBOOGc

Check us out at:
Our website: www.steampunk1577.org
Facebook: www.facebook.com/Steampunk1577
Instagram: www.instagram.com/steampunk1577
Email us at: avivrobotics@gmail.com

Last edited by RBY1577 : 10-10-2017 at 04:10 PM.
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Unread 10-10-2017, 06:31 AM
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Re: Electric Wheelchair Kit - FRC Team Steampunk 1577

Very interesting project! It looks like with some further testing and development, you could actually make a start-up company out of this idea. If you can injection mold the parts to be stronger and easier to produce than 3D printing, it looks like something you could sell as a DIY kit.

Have you thought about talking to Yad Sarah or a similar company that deals with wheelchairs to see if they have any suggestions for improvements or if they think this could be useful for the general public? I imagine they could be very informative if you talk to the right people.


P.S. - also I will add for any American team that might be looking to replicate this design, 4mm screws are equivalent to #8-36, 5mm with #10-32, and 6mm with 1/4-20
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Unread 10-10-2017, 03:09 PM
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Re: Electric Wheelchair Kit - FRC Team Steampunk 1577

Thank you for this generous contribution to the world community.

In addition to the obvious intended use, I can see many possible applications for the window-motor-to-4"-wheel printed hub.
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Unread 10-11-2017, 06:48 PM
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Re: Electric Wheelchair Kit - FRC Team Steampunk 1577

As one who saw you worked on this project days&nights, I'm proud of you all! Well done.
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Last edited by Lidor51 : 10-11-2017 at 06:52 PM.
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Unread 10-11-2017, 07:56 PM
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Re: Electric Wheelchair Kit - FRC Team Steampunk 1577

Very neat project! An easy bolt-on power unit could certainly make powered wheelchairs more accessible.

I am, however, a little curious about the motor selection. Those window motors have a peak power of about 20 watts each, which isn't very much for any sort of motorized vehicle. Is this capable of climbing an access ramp? Also, window motors are only designed to raise a car window up and down every few minutes. Do you have any concerns about them heating up quickly under high duty cycle loading?
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Unread 10-11-2017, 08:09 PM
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Re: Electric Wheelchair Kit - FRC Team Steampunk 1577

A great idea that is cost effective! I agree with earlier posts on the fact that more time and research could benefit. I am concerned about how easily it could climb slopes and if the friction between the two wheels is enough to withstand greater loads. I would highly recommend a new choice in motor. Look at how they work internally and design something with more output.
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Unread 10-11-2017, 08:18 PM
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Re: Electric Wheelchair Kit - FRC Team Steampunk 1577

Quote:
Originally Posted by BobbyVanNess View Post
Also, window motors are only designed to raise a car window up and down every few minutes. Do you have any concerns about them heating up quickly under high duty cycle loading?
I have done quite a lot of work with the similiar Denso Throttle Motors( the KOP motors everyone gets 4-8 of). Unlike say a Starter Motor which draws huge current for a short period of time and can't really be run continously, the smaller automotive motors are very durable and can be stalled for long amounts of time without any performance damage or smoke etc.( I tested locked rotor stall a few years back and it was still alive after 20+ minutes albeit very hot).

If your wanting to speed up the chair you could potentially wire two batteries in series for 24v operation.

I've heard that some of the KOP window motors have auto-resetting thermal fuses wired between the connector on the gearbox casing and the motor input terminals, so you may want to check that if your going to be placing them under continous load.
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Unread 10-12-2017, 12:05 AM
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Re: Electric Wheelchair Kit - FRC Team Steampunk 1577

This is a really cool idea and a very worthwhile pursuit.

Related to thedude's concern about it's ability to go up an incline is the concern that it can cross a street in the time allowed by typical traffic lights and it's ability to carry a sufficiently wide range of passengers, weight wise.
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