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It is well known that concentrated windings results in an increase of airgap flux harmonics, which leads to additional losses. In the wider field weakening regions, the machine yields a non-linear increase in losses due to the frequency-squared dependence of eddy current loss. This paper compares the higher frequency losses in the stator core, rotor core and magnets with different rotor magnet configurations...
This paper presents a design process of a 1kW interior permanent magnet machine with concentrated non-overlapping windings. The main focus of this design is to achieve a very wide constant power speed range and optimal efficiency throughout the entire speed range. The authors will explain how the increase in airgap harmonic components caused by concentrated windings affects core and magnet losses;...
The use of permanent magnet machines for traction applications is rapidly gaining popularity as magnets with higher energy densities are emerging. For traction applications, good field weakening characteristics are essential. In wider field weakening regions, higher frequencies drastically increases rotor eddy current losses. This is especially so for machines with higher MMF leakage harmonic content...
Distributed windings produce MMF waveforms which are almost sinusoidal whereas concentrated windings produce MMF waveforms which are high in leakage harmonic content. The increase in leakage harmonic content is beneficial in meeting the characteristic current equilibrium conditions for optimization of the field weakening range. On the other hand, these additional harmonic contents also lead to an...
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