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How to find voltage of electric motor?

Discussion in 'Sensors and Actuators' started by liomry, May 7, 2012.

  1. liomry

    liomry

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    0
    May 7, 2012
    Hi all,

    I've just started into robotics and electronics and I picked up a broken R/C car and salvaged the motors out of it, how can I check what voltage / current they take? I've checked but nothing written or engraved on them , just + terminal on the drive motor and nothing at all on the other motor(guessing a servo since it was for the steering?)

    The car took 4 x 1.5v AA batteries and had two motors, a few leds and a 27MHz receiver. The steering motor is smaller than the drive motor and is flattened on top and bottom
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,689
    Jan 21, 2010
    I would suggest the motors run from 6V
     
  3. liomry

    liomry

    16
    0
    May 7, 2012
    Thanks Steve,

    Is there a safe way to test the minimum voltage for these motors or the current that they draw? I know V=IR but I'm struggling to bring this into the real world
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,689
    Jan 21, 2010
    The motor won't follow V=IR, just use various voltages (under 6V) and measure the current. The current will change under load too.
     
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