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Axial Flux Permanent Magnets (AFPM) machines are a new kind of permanent magnet machines receiving more attention in the two recent decades. Many different structure of this machine was made. Axial flux machine has better "power to weight ratio", "efficiency", "smaller size" and "adjustable air gap" in compare whit radial flux machine. This article tries to...
Interior permanent magnet-synchronous machines (IPMSM) feature many favourable properties for e-mobility application as high power density and good efficiency. However, they require careful modelling because of strong anisotropies of the rotor, as they are also known from salient-pole synchronous machines. These anisotropies are often accounted for by different values for the d-axis and q-axis inductances...
The paper presents a new possibility of obtaining lower space harmonic content for the fractional-slot, tooth-concentrated windings by interspersing the phase windings. By using multiple layer windings it is possible to reduce or even to cancel some space sub-harmonics having as final result lower eddy current losses induced by the armature reaction in the iron structure of the rotor. The general...
This paper deals with some design criteria of axial flux permanent magnet synchronous machines, wound with concentrated coils: in particular, the application to direct drive wind power generation is considered. The structure and the features of these machines are illustrated, the main sizing equations are deduced, and some guidelines for the design are presented, also by means of a sensitivity analysis,...
This paper presents different methods to model permanent magnet materials within the 2D finite element simulation of electrical machines and discuss them. The modeling deals with both the material magnetic properties and the circuit equations related to different parts of the machine. The emphasis is on modeling permanent magnets as part of the rotor electrical circuit. The methods presented are compared...
The paper deals with a classification for bearingless motors with separated 3-phase concentrated drive and bearing windings. Based on fundamental equations of the electrodynamics specific force equations are deduced, in order to develop lateral force properties in rotating machines. Furthermore, a new classification for 3-phase concentrated windings is proposed and adapted to bearingless motor theory...
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...
The paper deals with the mathematical modelling of electrical drives employing polyphase permanent magnet synchronous machines. One focus is the prediction of model parameters like flux linkages, inductances etc. by means of two- dimensional analytical field analysis. Thus the complex model is based exclusively on geometrical and material data of the PMSM. Another focus is the transparent validation...
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