Abstract
To evaluate the rotor temperature field of a high speed permanent magnet synchronous generator (PMSG), an electromagnetic-eddy current-thermal coupled field model is constructed using 2D Time-stepping Finite-Element-Method (FEM). In the model, the electromagnetic field and the temperature field have the same meshed grids to make a node-to- node data transmission and are solved independently. The data transmission ensures the coupling of the fields and the solve order of these fields is controlled by an external program. Temperature-dependent parameters, for example conductivity, can be set in the model. Windage loss of the rotor calculated by empirical formulas is loaded to the temperature field. Distribution of the rotor temperature is obtained by a calculation example of a 100 kW, 45000 r/min microturbine generator. Experimental data are used to show the validity of the proposed model which is helpful to the thermal design of the high speed PM generator.
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