Cooling of electric machines

Why is an effective cooling important?

The thermal behavior of an electric machine is an aspect often neglected in its design process. The machine is designed only using an electro-magnetic point of view. The design of the cooling system is often the last step and must adapt to all the electro-magnetic constraints.

Temperature levels have a direct impact on the lifespan of a machine insulation system. Each machine has an insulation class for its windings corresponding to an operating temperature. The lifespan of a machine is 20,000 hours at its operating temperature. A basic model to predict the lifespan of a machine is to divide it by 2 for each 10°C above the operating temperature