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Discussion in 'General Electronics Discussion' started by dwreck, Nov 3, 2012.

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  1. dwreck


    Aug 19, 2012
    I have this dc motor which I've connected to 3 supercapacitors (2.7V and 80F each).

    Whenever I have the combined voltage of the supercapacitors more than 5.5V, I get something like this:

    I'm using a 5-volt dc relay to isolate the motor from the circuit. The switch of the relay is programmed to close for 900ms, and then open to stop the motor from moving.

    The resistance of the motor is roughly 1 ohm. When I have the voltage lower than 5.5V, the car moves fine.

    Anyone knows what causing this u-turn?

    Thanks in advance.
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    The first thing I'd be checking is that you're not overcharging any of the super caps.

    The other thing is that the video doesn't tell me anything about what might be happening that is not intended.

    Ah, last sentence. The U-Turn. I expect that you have rear wheel drive combined with excess power causing loss of control. Have you tried front wheel drive?
  3. dwreck


    Aug 19, 2012
    I managed to fix the problem. I removed one of the supercapacitors and I'm using just two now. It works perfectly.
    Possibly like you wrote, the motor was being overpowered.

    Thanks for your reply.
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