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Eddy current losses in rotor permanent magnets (PM) of synchronous machines with concentrated windings are calculated for sinusoidal stator currents. Three different calculation methods are compared in the FiniteElement environment: 1) analytical post processing of FE magneto-static data with multi-move and eddy currents calculated from vector potential, 2) direct FE magneto-static method, 3) time stepping with a FE program. From thermal measurements performed on existing prototype motors the losses in magnets are compared based on the temperature rises in the magnets at adiabatic heating.Index Terms--Concentrated windings, eddy current losses, finite-element calculations, permanent magnets.

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The thermal calculation of a 500 kW permanent magnet (PM) motor with surface mounted rotor magnets used for gearless traction in railway applications is discussed. The motor features a water jacket cooling. A 3D time-stepping Finite Element Method (FEM) thermal model in ANSYS is used. The model is parameterized for optimization of the motor thermal utilization. Fault situations are also investigated using a transient calculation. Thermal measurements with a 500 kW prototype motor, performed on a test-rig, are in good concordance with the numerical results.

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