In this paper, a fully HTS salient-pole electrical machine with a ferromagnetic core is considered. Analytical expressions for main parameters of the machine are obtained based on the solution of the Puasson's equation for vector magnetic potential. Obtained solution takes into account dimensions of active zone, HTS tape's properties, especially relative permeability
Słowa kluczowe: superconducting motor, HTS, high volumetric power electrical machines, electrical machines
W artykule analizowano maszynę elektryczną z rdzeniem ferromagnetycznym wykonanym z nadprzewodniak HTS. Równanie analityczne bazuje na rozwiązaniu róa)nania Poissona dla wektora potencjału magnetycznego. W analizie uwzględniono wymiary części aktywnej i właściwości taśmy HTS.
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High performance and specific power of HTS electrical machines make them the most promising in the way of develop of future electrical aircraft, high speed transport systems, wind turbines and etc [8, 9]. Design of HTS machine with HTS windings is the most interesting in case of high specific output parameters. In this paper fully HTS electrical machine with silent-pole rotor is described. Analytical expressions for the distribution of magnetic fields in the active zone of a fully HTS electrical machine. The design scheme of a multipolar salient-pole synchronous electrical machine with HTS windings on a magnetically soft rotor core is shown in Figure 1. In general, the stator winding can have different configurations and vary in the number of phases, slots, shortening, distribution, etc. To determine the analytical solution for the problem, the armature winding can be replaced by an equivalent current layer at the bore diameter. In particular, this approach was used in the studies of electrical machines with bulk HTS elements [1,2] and HTS windings [3, 4, 7]. Fig. 1. Design scheme of an electrical machine with a ferromagnetic rotor and HTS windings It is possible to use the superposition of the fields created by the currents in excitation and armature windings with the assumption of the constancy of relative magnetic permeability in ferromagnetic sections. The parameters of the machine under consideration are determined on the basis of approaches described earlier in [1, 4]. Therefore, in this paper obtained expressions take into account the relative magnetic permeability of HTS windings which can differ from , the magnetic properties of the salient-pole rotor can be taken into account only without saturation. The distribution of magnetic fields is described on the basis of Maxwell's equations with the following conditions on the boundaries of areas with different magnetic permeabilities . To set the problem of cal [...]
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