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Calculating Motor curve

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  1. Aug 29, 2016 #1
    Hi there,

    I have a motor peak torque, peak power, peak speed, rated torque, rated power, rated speed, torque at max speed.

    I was able to produce the peak torque curve.
    But, i don't understand how to create this continuous torque curve here. I have attach a link here, and somehow the continuous torque starts curving before the rated speed?

    I thought, the torque for the "continuous torque curve" should remain constant up to the rated speed then only start curving? I seen a lot of motor does the same. What formula should i use to calculate this curve/

    Power = 2*3.142*torque * speed

    Electric-motor-performance-courtesy-McLaren-Electronic-Systems.jpg
    http://current-e.com/wp-content/upl...mance-courtesy-McLaren-Electronic-Systems.jpg

    AT
     
    Last edited by a moderator: Aug 30, 2016
  2. jcsd
  3. Aug 30, 2016 #2

    CWatters

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    Norton blocks my access to that page but..

    Not all motors are rated for continuous use. Many are rated for intermittent use. In other words they might be able to deliver the rated power at the rated speed intermittently but not continuously. If you try to use them at max load continuously they may overheat.
     
  4. Aug 30, 2016 #3
    yup, i understand the concept.
    I'm just wondering how to plot the continuous torque curve.
     
  5. Aug 30, 2016 #4

    CWatters

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    I'm not sure it can be calculated easily. If you were the motor manufacturer you would have access to its thermal properties. That would allow you to work out how much power the motor can be allowed to dissipate as heat. That and data on the efficiency of the motor would tell you how much power and torque the motor can be allowed to deliver continuously at any given speed.
     
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