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1000 kilo newton meter (K/Nm) torque 
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#1
Apr1614, 07:14 AM

P: 2

i want to produce 1000 K/nm of torque using motors and gear , output rpm needed is 30 and 1000 k/ nm of torque
1) motor kva? and rpm ? 2) gear ratio and size ? 3) does it also require flywheel ? 


#2
Apr1614, 10:47 AM

Thanks
P: 1,948

You mean you want to produce 1000 kNm and a frequency of 30 RPM. The way you wrote it makes no sense.



#3
Apr1614, 10:48 AM

Thanks
P: 1,948

I also have no idea what a motor's kva is. No doubt another botched unit usage?



#4
Apr1614, 11:01 AM

Sci Advisor
PF Gold
P: 2,250

1000 kilo newton meter (K/Nm) torque



#5
Apr1614, 12:40 PM

Sci Advisor
Thanks
P: 3,732

Whether you need a flywheel or not will depend on how variable the load is. 


#6
Apr1614, 01:18 PM

P: 2

150 kva motor 3 phase 960 rpm using double stage gear 1st stage 78 inch dia Reducing rpm 10:1 2nd stage gear 36 inch dia reducing 3:1 ,how much the output torque 


#7
Apr1614, 01:26 PM

Sci Advisor
Thanks
P: 3,732

If your motor delivers that power while turning whatever revs are needed to get 30 RPM after going through the gearing, it's generating the necessary torque. (Although wise engineers will choose a motor that provides some excess capacity). 


#8
Apr1714, 01:53 AM

Sci Advisor
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P: 1,910

The practical implementation of such a system will be limited by the mass of the gear wheels and the box that holds them together. The gear box will weigh less if you use an extra stage with a final bull gear ratio closer to 3:1 than 10:1.
You might consider using an internal gear which has more tooth contact. An epicyclic with multiple planets could also help reduce total weight. An obvious alternative to such a heavy gearbox would be to use a hydraulic motor. A hydraulic “gear motor” for example exerts the hydraulic force on many teeth. The gear ratio is determined by the relative fluid volume per revolution of the motor and the pump. It is self lubricating and the hydraulic fluid can be cooled if necessary. 


#9
Apr1714, 07:26 PM

Sci Advisor
Thanks
P: 1,910

Here is some data on big planetary gearboxes.
http://www.boschrexroth.com/mobileh...73&Language=EN 


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