Torque Calculation

Just how it works out....

"The nominal torque of the motor T_N' is the torque developed by the motor at rated speed n, while delivering the rated power P. The relationship between these three parameters is

T_N' = 9550 x [P/n] (Nm)

where P = Power (kW)
n = motor speed (rpm)

Alternatively, torque T_N' in kgm can be given as
T_N' = 974 x [P/n] (kgm)

http://www.steelofab.net/high_efficiency_motors.html

Thank you. F.O.S is Factor of Safety.

Good thing you said that, because sometimes it means something else....

FOS - Definition by AcronymFinder

Here's the link to Konecranes, http://www.konecranesusa.com/

In other words contact Konecranes, replacing the motor(s) with something other than OEM that the equipment designed for could lead to a real can of worms.

Am I missing something? How did cranes and replacing motors get into it? I thought OP asked a simple question and got simple answers!

If you look at Wahsoo's pass questions, #1 and #2, you'll see he has an overhead crane that has some major issues with traveling. Breaking drive axle, wheel collar rubbing, and rail sides are worn out. Which all leads me to believe that he's wanting to re-size the drive motor to over come the excess drag caused by everything being askew.

Good observation. But this question, I asked out if curiosity!

The Horse Power or KW is calculated on the basis of work done in a given time.

In FPS system the H.P is ( 2 X (phi or 3.14) x N x T )/33,000 where N is speed in RPM and T is Torque in Lb.Ft.

In Metric System the H.P is ( 2 X (phi or 3.14) x N x T )/4500 where N is speed in RPM and T is Torque in Kg.M.

If you derive the above equation from fundamentals, you will get the constant 33,000 for FPS system and 4500 in Metric System.

Now the Torque in IS system (International Standards system) is reckoned as NEWTON-METRE or Kilo Newton-Metre.

If you derive from the fundamental you will have the constant of 9550.

DHAYANANDHAN.S