Permanent magnet synchronous machines (PMSM) gain more and more importance for
special drive applications. Up to recent years, PMSM were known for small drives, e.g. for
servo applications. In the last years, PMSM are increasingly applied in several areas such
as traction, automobiles, etc. Therefore, development of different machine types requires
attention to the thermal aspects since, at the end; it is always the thermal constraints
that will determine the power rating of the machine. To insure a successful design of the
electrical machines, it is necessary to be able to predict an accurate temperature distribution
in the most sensitive parts of the machine to prevent the damages that can occur either