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Wheel chair motor controller

Posted: Fri Apr 04, 2008 2:42 pm
by badtube
Does anyone know a site that I can go to and get technical info and a schematic on an INVACARE wheel chair controller?
It is MKIV GB Mod. 1109528

I did a web search and had lots of their company sites but no technical.
Any site that has info on these controllers would be of help.


Posted: Fri Apr 04, 2008 4:57 pm
by jwax
Can't help with technicals, but if it's in use, be cautious about repairing it. Liability issue. Let a bonded insured tech work on it.

Posted: Fri Apr 04, 2008 7:44 pm
by Dean Huster
You'll always have trouble finding manufacturer's information on medical products because of the liability issues. Their liability is tremendous. That's why Tektronix got out of the portable patient moniter business back around 1978 or so. 'Twas a shame because they had the best neonatal monitor on the market. Hospitals loved them.


Wheel chair motor controller

Posted: Sat Apr 05, 2008 8:09 am
by badtube
It is an old one out of a discarded chair. I wanted to try and use it for a soft start controller for an auto starter motor. I have a gyrocopter that uses a 24 foot , free spinning rotor blades. I presently use a starter motor to start it spinning, but you have to momentary press a button and that hits the starter with the full current. I was thinking that maybe with this controller I could soft start the rotor blades a little at a time until up to speed.
I have seen controllers advertized that you can use a 5k pot for speed control of a motor. But they are rather expensive to purchase for me to experiment with. I came across this old controller and wanted to experiment with it. But having a schematic on the unit would be good.
Thanks for the replies

Posted: Sat Apr 05, 2008 10:16 am
by dacflyer
i seen one guy use a large power resistor for his set up, his was actually home made, some really heavy gauge steel wire out of a old battery load tester, it was good for up to about 500 amps,
perhaps this might be an option ?

Re: Wheel chair motor controller

Posted: Sat Apr 05, 2008 11:57 am
by Bigglez
Greetings (No First Name Supplied),
badtube wrote:I wanted to try and use it for a soft start controller for an auto starter motor.
I would not expect a motor controller of this type to
operate an auto starter motor, which could draw
several hundred amps under load.

Why not find two six volt batteries and start with
one to get the motor moving, then swap to both
for full power?

Comments Welcome!

Posted: Sat Apr 05, 2008 5:37 pm
by jwax
It would help to know what the starting current actually is before trying to find a controller for it. Any idea?
That electric chair controller may be rated only 100 amps or so.

Posted: Sat Apr 05, 2008 7:37 pm
by dacflyer
Bigglez >> might not be a option if weight is a concern as it is with any light aircraft..

motor controller

Posted: Sun Apr 06, 2008 7:07 pm
by badtube
Hey guys,

Thanks for relpying. I will do some experimenting and let you know.