Dimensioning using load torque
The load torque ML results from the counter-torque of the driven machine plus
the efficiency η with which all mechanical losses are recorded.
According to the load characteristics the load torque during acceleration can
- gradually build up (for example, fan)
- reach the rated value at the start (for example, hoists)
- be present only after acceleration (for example, wood-working machines)
- be present constantly or intermittently
For a constant load torque ML = const. and rated speed n, the calculation is done
using the following relation: