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Question Power Rating on elec. Motors

Discussion in 'New users start here - FAQ' started by Kass55, Feb 28, 2017.

  1. Kass55

    Kass55 Member

    Joined:
    Aug 19, 2015
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    Occupation:
    PC support
    Location:
    UK
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    325Coins
    Ratings:
    +16 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, JRK
    Can someone clear up the power rating on electric motors....

    The original motors mentioned at the beginning of this thread, where 12V and 23A
    so to me as electric background that is 12V x 23A = 276 W (ignoring any heat loss / inefficientency)
    The motors from Australia, mentioned above, are only 200W so less powerful ?

    I asked a electric motor supply, who wants to sell 120W motor
    but he kept going on about the gearbox ratio.

    Surely I want the most powerful (highest W power) motor that the JRKs can take,
    then choose / fit the gearbox depending on: type of sim / weight / leverage used ?
    Kass55, Feb 28, 2017
    #1
  2. OZHEAT

    OZHEAT Active Member

    Joined:
    Oct 26, 2015
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    Australia
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    2,458Coins
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    My Motion Simulator:
    3DOF, DC motor
    Kass
    l'm not going to tell you what motor/gearbox to get.
    Power input to a brushed permanent magnet motor taking in to consideration friction,heat and other losses will be 80% at best and closer to 70%.
    276w power input @~72% =200w rated motor power output
    OZHEAT, Feb 28, 2017
    #2
  3. Kass55

    Kass55 Member

    Joined:
    Aug 19, 2015
    Messages:
    70
    Occupation:
    PC support
    Location:
    UK
    Balance:
    325Coins
    Ratings:
    +16 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, JRK
    That is okay - I just want a way to compare different motors.

    So I currently using front wiper motors from Ford Focus,
    I measured them, they draw up to 20A under load.
    so 12V x 20A - 70% so they are approx. max. = 168W motors
    So 120W are worse then I have, right ?
    Kass55, Feb 28, 2017
    #3
  4. Alexey

    Alexey Well-Known Member

    Joined:
    Sep 23, 2014
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    452
    Occupation:
    Electronics Technician
    Location:
    Adelaide, Australia
    Balance:
    8,060Coins
    Ratings:
    +620 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, Arduino
    Without a supplied graph stating the current/torque curve the power rating given to a motor is just a ballpark figure.
    My 200W motors were drawing well over 300W from the power supply.
    Alexey, Feb 28, 2017
    #4