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  • Users: esvhv
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  1. esvhv

    Acceleration time

    I think Jbartos was correct This thread would have been unnecessary if WR^2 (GD^2) were known. The integration of 1/MT - LT has been completed and all I need is a means of obtaining the WR^2 value, or a totally different means of finding the acceleration time without using the inertia values
  2. esvhv

    Acceleration time

    O.k. let me phrase it this way. I know the motor rating from the name plate value, and I have the curves from an analysis completed by some one else. If I obtain the max inertia value from the NEMA tables listed above, I would have to scale it down to a reasonable value. Would the amount of...
  3. esvhv

    Acceleration time

    Indeed the NEMA database is unavailable to me, and I would appreciate any help in obtaining it Secondly how do I convert WR^2 values to GD^2,
  4. esvhv

    Acceleration time

    I like Shortstub idea of using sets of performance data to find the inertia value, But using this idea yields only the motor inertia, I require the load as well Any suggestions??? In addition you quote the 3 second figure for a random motor but that is the range I am looking at do you have...
  5. esvhv

    Acceleration time

    Thanks to UKpete and electricpete your help was much appreciated
  6. esvhv

    Acceleration time

    Thanks very much electricpete and Ukpete both your suggestions are very helpful, Couple of questions on electricpete suggestion: 1.In the load estimation equation what is the +A? 2. Do the inertia estimation equations still work if I convert to SI units ie rad/sec and watts, instead of RPM...
  7. esvhv

    Acceleration time

    Is there a “fudge” or approximation to find the total inertia J that uses the KW rating or the various torque values??????
  8. esvhv

    Acceleration time

    Yes thanks for that, Unfortunately I do not have the j value for the motor or the load, all I have is the KW rating the various torque values. Why integrate between 0 and 2*pi*final speed ,and not just the 0 – final speed
  9. esvhv

    Acceleration time

    Hello All I have bit of a problem I have two torque speed curves, one showing the motor torque the other load torque. But I need to find the Acceleration time; I have the true torque values along each line in n-m and the speed in rad/s. In addition I have the kW rating of the motor. But I do...

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