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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;...
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...
Due to limited space availability in vehicular applications, machines with high torque density are required. One of the ways to maximize space is by reducing machine end winding length and increasing its effective stack length. This paper illustrates a general design process used for implementing non-overlapping concentrated windings an interior permanent magnet (IPM) machine for field weakening applications...
The application of concentrated windings in permanent magnet machines significantly reduces overall machine length, due to the elimination of end winding overlap making it more suitable for areas with space limitations. Efficiency is also increased due to the reduction of copper loss. In order to take full advantage of these benefits, optimization strategies have been implemented and its effects are...
The interior permanent-magnet (IPM) machine is used in many industrial drives. In order to analyze performance and to design efficient and fast controllers, accurate knowledge of machine parameters such as d- and q-axes inductances is essential. Although there are a number of methods available to calculate these inductances, none of them is considered standard. Accuracy levels of all these methods...
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