I need to calculate power requirement of each portion of tower crane (TC) since spec values are for general purpose.

In doing so,most are given in Kilowatt, but some in Newton-meter. So, I changed Newton-meter to Kilowatt by using:

Power (kilowatt) = Torque (Newton-meter) * rotational speed (radian/sec)

The resulting kilowatt is so small in compare with other models of same tonnage. e.g, slewing power of 8 ton:

TC = 2*65 Nm = 2*0.004 KW,

when other model of 8 ton TCs slewing power is given by 2*4KW.

Can anyone check whether my calculation is right or wrong?

 

Win...

Torque (in mN) is Power (in Watts) divided by Angular Speed (Omega in Radians per Sec)

Regards, Phil Corso