Rotational inertia of 75 hp motor
Rotational inertia of 75 hp motor
(OP)
I'm looking for a quick and dirty number for the rotational inertia of a 75 hp, 460 V, 3 phase TEFC motor. Nothing super accurate, just a ballpark.
Thanks in advance for the help. :)
Thanks in advance for the help. :)





RE: Rotational inertia of 75 hp motor
NEMA 460 V [60 Hz] 8 poles 75 hp 59 lb-ft^2: 6 poles 75 hp 39 lb-ft^2; 4 poles 100 hp 23 lb-ft^2 ; 2 poles 100 hp 14.5 lb-ft^2
RE: Rotational inertia of 75 hp motor
RE: Rotational inertia of 75 hp motor
WK2 = 0.02*2^(poles/2)*hp^(1.35-0.05*poles/2)
where
HP is output power rating in HP.
WK^2 in ft^2-pounds
They don't distinguish ODP vs TEFC, so that tells you it's not tremendously exact.
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RE: Rotational inertia of 75 hp motor