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RC car steering current

Discussion in 'Robotics & Mechatronics' started by zhaniko93, Apr 28, 2013.

  1. zhaniko93

    zhaniko93 New Member

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    Hello. I'm creating a simple RC car and I have faced a problem:
    the main and steering motors are fed from the same battery. when I turn left, for example, huge current is drawn to steering motor, as it doesn't rotate, and so if I want to steer while going, it slows a lot, in most cases it even stops. what shall I do?
     
  2. Norator

    Norator New Member

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    Install a slip clutch between the motor and the steering mechanism?

    Power the steering motor from a current source rather than a voltage source?

    BTW, you know the difference between justice & revenge? IIRC Ms. Vos Savant said the first becomes the second when it starts being fun.
     
    Last edited: Apr 28, 2013
  3. Joe G

    Joe G Member

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    My guess would be that the steering mechanism is binding real badly when turning left, that is if turning right is pulling a decent currant and/or the battery is just barely sufficient :(
     
  4. dave

    Dave New Member

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  5. Norator

    Norator New Member

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    You may be able to find a resistor that can be placed in series with the motor of such value that the motor supplies enough torque to turn but the stall current is not too high.
     
  6. alec_t

    alec_t Well-Known Member Most Helpful Member

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    I would suggest using a smaller geared-down steering motor to give the same torque at lower current.
     
  7. BioniC187

    BioniC187 Member

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    Yeah, do what alec_t suggested. I had the same problem with my old RC. I used gears to increase the torque output from the steering motor, and it worked great
     
    Last edited: Apr 29, 2013
  8. zhaniko93

    zhaniko93 New Member

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    I can't change motor, I bought a RC car, took whole PCB out but left motors in, so it HAS to work with those motors under some configuration. any help?
     
  9. Joe G

    Joe G Member

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    On my autonomous/RC car, when it turned full right/left, the linkage would stop, but the motor was still "ON" and sucking alot of current, causing the micro-controllers to reset. I thought it was a 'bug' :( after countless hours(days),
    I realized what was going on :) I added two steering limit micro switches. They cut the power to the motor when at full lock, but allows the opposite steering to reverse the motor. Hope this may help you.
     

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