A novel relatively small wideband antenna is introduced for the mobile application of direction finding (DF) systems covering the frequency range from 150 MHz to 3 GHz. The proposed directional wideband antenna is a rounded‐edge directed bow‐tie antenna which is electrically small when considering at lower operating frequencies. A good agreement is obtained between the simulation and measurement results of the designed antenna. The performance of the antenna for DF applications is verified both in anechoic chamber measurements and in open field measurements. In addition, in open field DF measurements the proposed antenna is compared with a commercial antenna. During the tests, one of the angle of arrival estimation technique based on phase differences of the signal at the antenna elements, interferometer method, and combination of the phase differences and amplitude values of the captured signal were used. As well as, k‐means clustering used to reduce undesired error due to environmental effects.

ÖZETBu çalışmada, Anahtarlamalı Relüktans Motorlar'da (ARM) yüksek tork ve geleneksel sargı yapısına göre düşük kaçak akıya sahip yeni bir ARM yapısı önerilmektedir. Geleneksel ARM'lerin aksine yeni yapıda sargılar doğrudan kutuplar üzerine sarılmamıştır. Sargılar üç katmanlı olarak birbirinden yalıtılmış şekilde ve rotora daha yakın bir yere yerleştirilmiştir. Her faz sargısının iki yanında hareket edecek rotor kutupları oluşturulmuştur. Böylece faz sargılarında oluşacak akı eksenel olarak stator kutuplarından ve rotor kutuplarından devresini tamamlamaktadır. Bu özelliği ile geleneksel ARM'lerden ayrılmış ve eksenel akılı anahtarlamalı relüktans motor diye adlandırılmıştır (EA-ARM). Önerilen motor geometrisinin ANSYS Maxwell programında 3 boyutlu manyetik analizleri ve parametrik analizleri gerçekleştirilmiştir. Önerilen yapının prototipi geçekleştirilmiş ve deneysel sonuçlar ile simülasyon sonuçları karşılaştırılmıştır.Anahtar Kelimeler: Anahtarlamalı relüktans motor, eksenel akılı anahtarlamalı relüktans motor, manyetik analiz, parametrik analiz THE MAGNETIC ANALYSIS AND DESIGN OF NEW TYPE AXIAL FLUX SWITCHED RELUCTANCE MOTOR ABSTRACTIn this study, a new SRM structure with lower flux than high torque and conventional winding structure is proposed in Switched Reluctance Motors (SRM). Unlike conventional SRM motors, the winding are not directly rolled over poles in the new structure. Windings are placed to somewhere closer to rotor as three layered and isolated from one another. Rotor poles which will move on both sides of each phase winding have been created. Thus, the flux created in phase windings completes its circle from stator poles and rotor poles axially. With this feature, it is different from conventional SRMs and named as axial flux switched reluctance motor (AF-SRM). The 3D magnetic analysis and parametric analysis of the proposed motor geometry have been realized in ANSYS Maxwell program. The prototype of the proposed structure has been made and experimental results and simulation results have been compared.

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