We have several factors to consider that affect the life of electric motors, such as thermal, mechanical, electrical, environmental and poor maintenance. These factors change the temperature of the engine relative to the ambient temperature, because of internal losses.
The storage of the engine is also very important and should be suitable for preserving the quality of the engine that is still in stock, unused.
There are many indications of adjustments for the enormous diversity of thermal models, because of the different factors that damage the temperature variation of an engine.
To determine the final temperature of the electric motor, the simplified thermal model will be applied, where the motor is considered a homogeneous body, and the absorbed energy is evenly supplied to the environment. At the beginning, the driven motor will have a temperature increase until reaching the thermal equilibrium, it is when it will initiate the process of heat exchange with the environment.
When developing the conjugate to drive a mechanical load coupled to its axis, the electric motor will have an increase in temperature. This temperature must not exceed the value defined by the insulation class. To determine this elevation will require the development of a thermal model.