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The possibility of obtaining lower space harmonic content for the fractional-slot, tooth-concentrated windings by multiplying the number of coils, leading to bigger number of layers in the armature slots is presented. 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...
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...
Permanent Magnet machines have a high force density and high efficiency. These machines can be made cost effective by using fractional-pitch windings as the fabrication of such windings can be automated. However, one big challenge to design such machines is to analyze the eddy-current losses, specifically in solid back-iron of the rotor/translator and magnets. This paper compares analytical calculation...
The permanent magnet synchronous machine with an external rotor is the most important device for high performance electrical drive systems in particular for hybrid electric vehicles. The paper discusses finite element analyses of such a machine with concentrated tooth coils in terms of a comparison of both Y- and Δ-connected stator windings. As the evolved electromagnetic torque is one of the most...
Permanent magnet machines with windings concentrated around each tooth gain more and more importance. In this paper, the magnetomotive force of a three-phase winding with concentrated coils will be analysed. As an example, a machine with a two-coil zone width with opposing flux is regarded. It will be shown that there are two different winding alternatives with four different rotor pole numbers that...
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