Modelling and precalculation of additional losses of inverter fed asynchronous induction machines of traction drives

The evaluation of additional losses of inverter fed asynchronous induction machines with design and operation is an important task for many years. On the other hand, asynchronous induction machines used with traction drives of rail transportation vehicles have different design strategies compared against commonly used standard machines. Since such machines have a very high utilization additionally, accurate modelling and precalculation of the additional losses caused by the inverter are an important task with both tender phase as well as electromagnetic and thermal initial design of these machines. Thus, the main components of these additional losses are discussed based on the spectrum of the non-sinusoidal voltages supplied by the inverter. An important viewpoint of modelling and precalculation presented herein is given to the comparison with detailed measurements from different already built machines.