Synchronous machine model considering dynamic losses and thermal behavior

For the development of an electrical drive system accurate modeling of the machine is essential. Usually, the motor losses caused by discrete switching of inverters are neglected during the design phase, because these losses can only be obtained by solving complex models by coupled finite element analysis (FEA). This paper presents an extended synchronous machine model including dynamic iron losses and their temperature dependency. The synchronous machine model with spatial harmonics is extended by an analytic flux linkage based approach to consider dynamic losses of the drive during the system design process. The on-line calculated losses are fed to a lumped parameter thermal network (LTPN) to track the thermal behavior of the machine. The combination of these models leads to a computationally fast electrical drive model that includes effects like switching harmonics and thermal behavior of the machine. The proposed structure reaches a good accuracy without the need of coupled FEA.