It is of extreme relevance that the load considered appropriate is carried out according to the workload that must be carried out, a factor that in most cases is simple and easy to determine. In the event that the work required of the driven machine has temporary overloads, the power of the motor must be subtly higher than the required power. It is important to stress the importance of limiting the increase in losses, by properly maintaining the machines and mechanical components of the drive, such as adjusting the gaps, proper lubrication and verification of the alignments, for example.
Thus, any type of electric machine is suitably dimensioned so that it is capable of supplying a nominal torque Cn, at a nominal speed Nn. That is, for a nominal power Pn, the calculation that must be performed is Pn = Cn x Nn. The electrical losses, also called thermal losses, can vary according to the square of the resistant conjugate, which is charge. On a properly sized motor, the rugged torque must be less than the rated torque. If it is equal to or greater, the resulting heating will be considerable. However, an underloaded motor may exhibit a subtle reduction in throughput.