22vdc wheelchair motor

Discussion in 'General Electronics Chat' started by seesoe, May 31, 2009.

  1. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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    hello, i have a 22vdc wheelchair motor with gearbox.

    i simply need to control the motors speed with a pot. im not sure what type of controller or setup i would need for this. also this will run off 120vac instead of batteries. at 22v the motor runs really fast compared to what i need it to run at, I'm probably looking at a window of 0-12 or even 0-6 volts.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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    Why do you present it as a 22 volt motor? That is a very odd voltage. 6, 12, or 24 volts is much more standard. What kind of current does it draw? Do you have a transformer to step down the line voltage? If not, you will need to determine the correct voltage and current, and obtain one with those ratings. What is your application?
     
  3. Smoke_Maker

    Active Member

    Sep 24, 2007
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  4. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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    Because that's what the motor presented to me. Yes I know 22 is odd..
    This is going to be used for a conveyor belt.
    I do not have a transformer as I was hoping maybe I could have a 2 in 1 controller

    I'm not sure on the amps myself I'm trying to get the info for the motor, all it has on it is company, model and 22v
     
    Last edited: May 31, 2009
  5. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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    i contacted cim but this is the only info that comes on the motor

    cim
    pm805-001
    22vdc
    040306
     
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    If it is anything like Permobill's C300 CORPUS, the motor is250W, 22V DC, @ 11.5A. Operates on two 12V batteries. To opperate from 120AC you need a brute-force power supply and a PWM speed control. For a power supply I used a dead UPS transformer, microwave filament transformer, a big bridge rectifier, 10A 120V fuse, & 20A DC circuit-breaker., +500μF cap. If you are despeaite, carefully remove high V winding from microwave oven transformer, also the filament winding. Wind on about 5 turns of any kind of wire, measure V and compute number of turns to give 24V AC. Remove wire , insulate primary with high temp, transformer tape, wind on required number of turns of # 10, magnet wire, or equivalent in a number of strands of lighter gauge wire. Might be around 55 turns as est. My suggestion-DO NOT DO IT. Maybe a 50A arc welder??
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    Here's a supply to look at:
    http://www.mpja.com/prodinfo.asp?number=17429+PS
    24VDC @ 12.5A POWER SUPPLY, $24.95 + shipping.

    You'd be hard-pressed to find something that matched your requirements exactly at that price.

    Add a PWM circuit for speed control.
     
  8. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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    pretty interesting, after calling a handful of people, i found out that the motor came off of a Permobill c300, nice call bernard! however i don't feel like making the project messy and doing something like you explained, I'd rather go sgtWookie's route.

    24v for the conveyor is WAY to fast, i don't even want the motor to have 24v potential. like i said before im thinking 0-12 or even 0-6 volt rang.

    with that said, im not sure where to start anymore, wouldn't i buy a transformer according to the controller's needs? and lets say a good guess at the motors amps is about 14 (the company said at 24vdc its about 20vdc)

    so i guess i need to be looking for a 15 or so amp 12vdc PWM controller and a transformer that meets the controller's needs?
     
  9. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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  10. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    MY guess @ 12V current around 8A, should be easy to find & cheap.
     
  11. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Not so cheap, I'd stick with SgtWookie's power supply with PWM controller.
     
  12. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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  13. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    I do not see a problem with 24V when used in conjunction with a speed controller, speed 0-max
     
  14. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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    well yeah, however the issue is safety. this is for a cooling conveyor belt that is in a bakery and the speed needs to be adjusted up a few notches every once in a while, the oven does not maintain a constant temp, 24v will mess the belt up physically and mechanically, its not designed to operate that fast. so i wanted 12v as the potential max, even though i think 12v is to much, i can work with that.

    in the end i think it would be just fine to superglue some sort of stopper on the knob so it wont go any faster than i need...

    i ordered this for the controller
    http://www.electronickits.com/kit/complete/motor/CKMX066.htm

    and this for the power supply
    http://www.mpja.com/prodinfo.asp?number=17429+PS

    now till they come in:), thanks all i hope things work out, ill post back with some pictures.

    cheers
    seesoe
     
  15. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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    thank you everyone the system worked out great!, sorry for the late results:p
    i bought a metal project box from radio shack and mounted the controller in there with a lighted power switch, i then cut a circle in the bottom of the box to align up with the circle on the top of the power supply, as the power supply had a cooling fan on it, i used its screws to screw the controller box to it. the motor is spring loaded for tension.

    one thing im having issues with is the sensitivity, for my application the controller is very sensitive, besides gearing, would it be possible to change the 10k pot out for like a 20 or something? or it doesn't work like that?

    thanks again:)
     
  16. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Thanks for the pictures. To decrease sensitivity of pot ajjustment, might add a resistor to each end of pot , or if 10k is required use smaller pot [ 2 to 3k]with resistors on each end to make total 10k with desired speed about in center of pot. Any chance for a schematic??
     
  17. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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    sorry about that i meant to link the controllers page and the PDF
     
  18. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Sorry. I missed PDF. The comparator ,IC/2,probably would not mind if you increased value of R5 & R6 a bit to decrease setting sensitivity, might try doubling.Would you let us know how it works out.
     
  19. seesoe

    Thread Starter Active Member

    Dec 7, 2008
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    one of them is 4.6 kohm and the other is 5.6 kohm, would a 10kohm for both work?, or do i need to change the pot instead?
     
  20. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    If your desired speed is around center of pot, 10k for each should be allright, keep 10k pot.[for now ].
     
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