MOTOVARIO
10
6
METHOD OF SELECTION
LEGEND
i
N
= nominal transmission ratio
i= effective transmission ratio
n
1
= input speed [rpm]
n
2
= output speed [rpm]
fs= service factor required by the application
fa= service factor according to classification of load and daily working hours
fb= service factor according to number of starts per hour
fc= service factor according to motor installed type
Pth= nominal thermal power (kW)
ta= thermal factor according to ambient temperature and intermittent duty
tb= thermal factor according , depending on cooling system
Tamb= ambient temperature [°C]
P
N1
= nominal power at high speed shaft[kW]
M
N2
= nominal output torque at low speed shaft [Nm]
P
1
= input power [kW]
M
2
= output torque at low speed shaft [Nm]
M
2max
= overload torque at low speed shaft [Nm]