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Electric scooter speed contoller

Discussion in 'Electronic Basics' started by George Herold, Jun 6, 2013.

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  1. Hi guys, I scored an electric scooter on trash day. (A Schwinn zone
    Of course the SLA batteries were toast. (2 X 12V @10A-hr.) But I’ve
    got two old power wheels from when the kids were younger. (What, me
    throw something out?) 4 x 6V @12 A-hr. I charged up the old
    batteries but found one of those was dead also. (It refused to have
    any charge pushed into it.) So I figured with three I’d have 18V
    which should be enough. And it is, it runs fine. (maybe 10mph on a
    Now here’s the problem. There’s an electronic speed control (hidden
    somewhere.. I haven’t found it yet.) And there must be a low voltage
    cutout in the controller. So when the current draw drops the battery
    voltage below some point the controller cuts out.
    So I’d like to find out first where the speed control is hidden. And
    then I’m hoping I can hack it and drop the voltage cut-out.
    I’ve done a few web searches, but I mostly find sites where they want
    to sell me something... nothing useful. Any hints on finding
    schematics for something like this would be appreciated.

    As a side note: I took apart the thumb throttle control on the handle
    bar and discovered only a pot. The sad news is that it looked like a
    little trim pot... I guess those last a bit longer than their 200
    rotations spec.

    George H.
  2. Jamie

    Jamie Guest

    integrated controller in the motor?

  3. I think that's what it must be, several (three or more) wires head
    into the motor housing. It's says Currie Electro Drive on the
    aluminum cover but no numbers. There are four screws holding the
    alum. cover to the motor. Of course I can't take one of them off
    without taking the whole back end apart. :^(

    George H.
  4. Tom Biasi

    Tom Biasi Guest

    So, take it apart. Did you forget where you posted.
  5. Yeah yeah... A project for my son and I this weekend.

    George H.
  6. Tom Biasi

    Tom Biasi Guest

    Good luck. Help is here.

  7. Thanks Bill, Well we took the motor apart this weekend (only a few
    minutes of work) and indeed the electronincs is built in to the
    motor.. but it's all potted in the base, and buried underneath the
    rotor. I guess the 'easy' solution is to buy another battery.

    I was thinking that the voltage cut-out is really too low for 24
    volts. Since we could run the thing for a while with just 18
    Volts... If we get another battery I'll warn my not to drain it all
    the way down.

    George H.
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