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This paper presents calculations and measurements for a permanent magnet synchronous machine (PMSM) with buried magnets. Due to wide field weakening capability and high utilisation of this external rotor machine, it can be especially used for traction applications. The steady-state torque is about 346 Nm and overload torque at three times nominal current is about 580 Nm. Fractional-slot concentrated...
This paper presents a two-dimensional analytical calculation method for the eddy-current problem in the rotors of permanent magnet synchronous machines. The method takes into account the reaction field of the induced eddy-currents and is, therefore, not restricted to cases where the skin depth is large compared to the geometrical dimensions of the magnets and the rotor yoke. We apply the method to...
When a non-magnetic, high-strength metallic retaining sleeve offers advantages over a non-metallic (e.g. carbon fiber) one, it is possible to consider the application of a high conductivity shield "coating" on this sleeve to reduce the surface eddy current losses due to non-synchronous fields. One can start by using a Maxwell's equations based analytical model to "screen" for the...
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