nominal speed definition
Nominal speed. Nominal speed (nN) is a suitable, rounded speed value for classifying the speed range (see Nominal value). Nominal speed is no longer the speed previously agreed on in the supply contract, but typically a deviating, rounded, and generally applicable speed such as 2,900, 1,450, or 980 minâ1 (rpm) for a mains frequency of 50 Hz or 3,500, 1,750, 1,180 minâ1 (rpm) at 60 Hz.