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24v 120w dc motor estimated peak current

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by wimpo`, Aug 3, 2010.

  1. wimpo`

    wimpo` Member

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    Hello I have a question about these 2 motors.
    [​IMG]
    They are from an electric wheelchair.
    It says on the label that it will draw 9 amps, but what would be the estimated current when reversed.
    and would these be good enough for a 2dof platform.

    thanks in advance.
  2. Ads Master

    Ads Master

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  3. Frakk

    Frakk Active Member

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    If your question is: would these be good enough for a 2dof platform?

    The answer is: depends.
  4. wimpo`

    wimpo` Member

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    no the question was meant to determine the estimated amps these motors will draw in a 2dof simulator.
    the reason is that my power supply is 24v 25a.

    about being used for a 2dof well a joyrider simulator will be easy because of the fact these motors are a lot stronger than wiper motors.
    frex style is not really my interest.
    or platform
    [​IMG]
    which i think are a bit to much for these motors, that's why I am asking.
    sorry for the clarity of my message.
  5. Frakk

    Frakk Active Member

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    The easiest way to figure out the stall current is to measure the resistance between the (+) and (-) wires of the motor.
    You should measure a low resistance. Ohms law: Current = Voltage / Resistance.
    If you measure 10 ohms and you use 24V, your current will be 2.4A for each motor.

    A rough estimate from the specs 24V/120W, the current is 120/24 = 5A, but who knows how they determined the 120W power.

    Don't forget, this is only for STALL current. If the motor is rotating one way, then suddenly reversed, the current spike could be much higher than the stall current depending on the speed and load on the motor. A properly designed DC motor driver can eliminate reverse current spikes by braking the motor before reversing it.
  6. wimpo`

    wimpo` Member

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    yeah one of the motors still has his electric brake(the one on the left).
    if you put 24 volts on the two black wires the brake is of when voltage is <24v the brake is on.
    but it seems that the other brake is missing so that isn't an option any more.
    and about braking the motor that's done by putting 24v on - and + ?
  7. akina

    akina New Member

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  8. wimpo`

    wimpo` Member

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    thanks a lot I think I understand now