This master thesis is focused on analysis of motor heating problems occurring due to ohmic losses within different operation conditions. The main goal of the thesis is development of a two way coupled electromagnetic and thermal model, in which temperature dependent copper losses are taken into account.
In the first part of the thesis, numeric model of electrical motor with permanent magnets was built. Simulation results obtained with electromagnetic analysis were successfully verified with experimental measurements. The thermal analysis was performed based on the numerical modelling and analysis of the most critical thermal contacts in the machine. The electromagnetic and thermals models were than coupled in order to analyse the influence of the thermal properties on the electromagnetic properties of the motor. Within the final part of the thesis we modelled the machine slot by assigning uniform material properties in order to simplify the thermal calculations and to reduce computer memory usage.
The results presented in this master thesis represent an important step towards development of two-way coupled electromagnetic and thermal analysis. In addition, the acquired knowledge could be also used for analysis of other temperature dependent phenomena in the motor.
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