Re: [CAD_CAM_EDM_DRO] help in selection of servo motor

the motor is AC servo.
 
can i use simple 4KW AC drive?
 
our application is not very precise.
 
the motor was running on concrete plant at Cubar. 

--- On Sat, 10/18/08, Jon Elson <elson@...> wrote:

From: Jon Elson <elson@...>
Subject: Re: [CAD_CAM_EDM_DRO] help in selection of servo motor
To: CAD_CAM_EDM_DRO@yahoogroups.com
Date: Saturday, October 18, 2008, 11:26 PM






Shumaim Shaheer wrote:
> Dear All,
>
> I have following data of servo motor. could you please help me in selecting the drive.
>
> Also please tell me how to calculate the voltage , current, frequency & Kilo watt from the following data.
>
> Mo/Mn 26.0 /18.0 Nm
>
> Io/In 20.0/ 15.7 A
>
> n 3000 min
>
> Iomax 83.6 A
>
> R= 0.45 ohm
>
> Jr 86.96 kgcm3
>
> KV 47.36 V/1000 min
>
Well, 47.36 x 3 = 142 V maximum back-EMF. At continuous rated current,
add 20.0 * 0.45 = 9 V, for 151 V.
Or, if you can find a servo amp that can do 83.6 A, then it would be 142
+ (83.6 * 0.45) = 180 V.
Peak power in is 180 * 83.6 = 15048 W, or 20.2 Hp. Continuous power in
is 151 * 20 = 3020 W or 4 Hp.
3000 RPM maximum. Looks like maybe 26 or 18 Nm continuous torque. Not
clear on the two ratings (Mo/Mn and Io/In) these may be at stall vs. at
rated speed. What kind of machine are these on, and do you really need
the full performance of these motors?

Jon














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