RMS Load Calculator

RMS Load Calculation
Load Time
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Total Time RMS Load







AC Motor Speed
rpm Hertz No. poles % slip




BTU per Hour Loss at continuous full hp rating
BTU/hr hp % efficiency




Time to Accelerate to contract speed
seconds fpm rate, fps2 jerk, fps3




Time or Torque to Accelerate
Accel. time Total motor accel. torq. Load torq. at motor shaft Load WK2 at motor shaft Rotor or armature WK2 Change in speed
seconds ft-lb ft-lb ft-lb2 ft-lb2 rpm

Note: If power is started at the motor shaft, enter 100 for % efficiency. If stated elsewhere, enter the overall efficiency back to the motor shaft.




Power
hp kw




Force
lb kg Newtons




Speed, Linear
fpm m/m m/s




Torque
ft-lb Nm Kgm




Inertia, WK2
lb-ft2 kgm2 Nm2

Note: GD2 = WR2 or WK2 x 4




Horsepower, Rotating
hp ft-lb rpm % efficiency




Horsepower, Linear
hp lb fpm % efficiency




Kilowatt, Rotating
kW kgm r/m % efficiency




Kilowatt, Linear
kW kg m/s % efficiency



Last Updated September 1, 1998


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