The maximum temperature that can be supported by the insulation-based components found in the electric motor is usually calculated to ensure effective operation in an environment with an average temperature of approximately 40 ° C.
It is therefore extremely important that the technician responsible for the maintenance process properly checks and controls the ambient temperature to ensure that it does not exceed the values for which the engine was originally produced.
There are care with the voltage variations that need to be rigorously taken. The thermal balance of an engine may vary depending on the change in the supply voltage. A voltage drop makes it possible to limit the flow of the magnetic circuit, thereby reducing the losses in the iron and the no-load current. However, the motor torque will need to overcome the resistant torque, so as to prevent a high increase in slip.
As the motor conjugate results from the process between the flow and the intensity of the absorbed current, if the flux reduces, the current intensity increases. With the load current significantly increased by the voltage drop, the motor can heat up, causing losses.