Axial flux switched reluctance machines (AFSRMs) exhibit unique characteristics that specify their superiority over other topologies in specific applications. A number of researchers have studied the efficient design and constructed structures in different types of AFSRMs. Each of such studies seeks to produce a motor with improved characteristics. Here, a comprehensive study is performed in AFSRMs, including their design considerations, sizing equations and the structural changes. The sensitivity of parameters for efficient operation is investigated. Also, the comparisons among topologies are provided for each of the identified metrics. This study ends with a comparison summary, which shows the performance indices evaluation of different topologies to utilise in various applications.
Axial flux permanent magnet machines (AFPMs) are potential candidates for direct‐drive wind turbines (DDWTs) due to offering high value of torque density. In slotless AFPM topologies, the cogging torque is absent which makes them more suitable for DDWTs, which provides an easier turbine start‐up. In this research, a robust design and optimisation procedure of a slotless double‐sided AFPM is discussed. The non‐linear magnetic equivalent circuit is established and the optimisation is performed by the response surface methodology to achieve a cost‐effective generator with high power density value. The generator is prototyped and the test results are presented comparing them with the numerical study and non‐optimised design results. To minimise the AFPM torque ripple which is necessary for DDWT application, a cost‐effective solution is proposed leading to a dramatic improvement in the AFPM torque ripple without reducing the average torque.
Electrical machines are widely used in home appliances, the performance of which is mostly related to the quality function of the electrical machines. What has been used so far in home appliances brought with themselves a wide assortment of advantages and disadvantages. With the aim to overcome the drawbacks of the previously implemented electrical motors in washing machines, a new configuration of flux switching permanent magnet motor (FSPM) with the segmented outer rotor (SOR-FSPM) is proposed benefitting from a direct driven drum. To reduce the cogging torque as well as torque ripple and to improve the total harmonic distortion, cutting the stator in a way to lower overlapping between the rotor and stator pole, inserting notches into the poles of the rotor to modify the air gap between the stator teeth and the rotor segments are proposed. The Taguchi method and sensitivity analysis are further applied to find the best combination set of changes in such a way to smoothen the chart showing reluctance between stator and rotor and fix the zero-point crossing of the flux linkages in different rotor positions. Finally, the proposed SOR-FSPM is prototyped, and experimental results along with the finite element method results are discussed and compared in order to verify the design process.
K E Y W O R D SAC motors, brushless machines, design of experiments, finite element analysis, optimisation, permanent magnet machines, Taguchi methodsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
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