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This paper investigates the challenges of including saliency ratio as an objective function in the design optimization of interior permanent magnet (IPM) machines. The saliency ratio is the ratio between q- and d-axis inductances. Improvement of the reluctance torque component and self-sensing capabilities are directly related to the saliency ratio of the IPM machine. Thus, the maximization of the...
Concentrated non-overlapping windings (CNW) have recently gained popularity due to key attributes of reduced machine axial length and simplified manufacturing. These attributes make it relatively more suitable for traction applications where reduced size and cost plays a vital role. In traction applications, good field weakening performance is desired. In this paper, the field weakening performance...
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...
This paper presents a novel sensorless direct torque controlled IPM synchronous machine fed by a matrix converter. The input power factor is controlled by applying two active switching combinations in each control cycle. The FFT spectrum analysis shows the better input quality without any negative effect on the output as compared with the classical HDTC. A torque ripple minimization strategy is used...
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...
The implementation of concentrated windings in interior permanent magnet (IPM) machines has numerous advantages over distributed windings, with a major disadvantage being the decrease in saliency ratio. Theoretically, this would result in a lower field weakening range which is undesirable for traction applications. Although it is revealed in some studies that concentrated winding results in lower...
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