CATALOGUE

Given ω v the fast revolution speed and α v the angular acceleration of the fast shaft, the inertia torque which
is necessary to counteract is equal to J•α v and the respective inertia power P j is equal to J•ω v • α v . In case
the time curve of the fast shaft speed ω v can be traced back to one of the four schemes below, linear or
sinusoidal, where A is the maximum speed in [rpm] and B is the cycle frequency in [Hz], the calculation of
the inertia power in [kW] can be simplified, by taking A and B parameters and by calculating:
2•J•A 2 •B
P J =
91188
The power P j must be added to the equivalent power P e and a verification of the correctness of the size
chosen on the descriptive tables must be carried out. If not correct it will be necessary to change the size and
effect new verifications.
Rotation speed [rpm]
Time [s]
Rotation speed [rpm]
Time [s]
Rotation speed [rpm]
Time [s]
Rotation speed [rpm]
Time [s]
A
Rotation speed [rpm]
0 1/(2B) Time [s]
1/B
182