Power Analysis of Toroidal Core Electromagnetic Energy Harvesters for Transmission Lines

Introduction. As the need for energy increases, energy harvesting methods have also been intensively researched. Energy harvesting techniques which are a way of converting low amounts of energy from the environment into electrical energy can be used to meet the energy needs of low-power electronic devices and sensors. The increase in such sensors and devices with low power consumption also makes energy harvesting techniques more important. One of these harvesting techniques is energy harvesting from electromagnetic fields, which is obtained from transmission lines. Aim of the Article. The article is aimed at developing an effective electromagnetic energy harvester from energy transmission lines for unmanned aerial vehicles. Materials and Methods. The method of harvesting energy from transmission lines through magnetic field energy harvesting is reviewed. Theoretical analyses, Finite Element Analyses (FEA), and experimental studies are conducted on toroidal core structures designed in different sizes and with different materials. Results. Among the selected materials and under the specified line conditions, current of 0‒30 A and a frequency of 50 Hz, the highest power of 695.516 mW was harvested by the 60x30x20 sized ferrite core harvester at a line current of 30 A. Discussion and Conclusion. Detailed experiments were conducted based on the 60x30x20 mm ferrite core, which demonstrated the highest induced voltage. Different load resistances were used to find the resistance value for the highest power at each current value. The optimal load resistance for maximum power transmission was determined for each core using the curve fitting method at all current values

GEOMETRY BASED FLUX BARRIER OPTIMIZATION OF INTERIOR PM MOTORS

Son yıllarda, sahip oldukları üstün özellikleri nedeniyle gömülü mıknatıslı senkron motorlar elektrikli araçlar gibi çekiş (cer) uygulamalarında sıklıkla tercih edilmektedirler. Bu motorlara ait rotor geometrisi diğer bir ifadeyle mıknatıs ve akı bariyeri geometrileri senkron motor performansını önemli ölçüde etkilemektedir. Gömülü mıknatıslı senkron motorların verimi, tork dalgalanması ve akım başına üretilen maksimum tork değeri (ABMT) gibi önemli elektromanyetik performans parametrelerinin iyileştirilebilmesi için rotor ve buna bağlı akı bariyeri geometrisinin optimize edilmesi gerekmektedir. Manyetik doyum ile sınırlandırılan bu karmaşık geometrinin optimizasyonu ile birlikte motorun performansı arttırılabilmekte, bazı uygulamalarda ise mıknatıs kullanımı azaltılarak motorun toplam maliyeti düşürülebilmektedir. İfade edilen sebepler dikkate alındığında bu çalışma, rotor geometrisini oluşturan ve motor performansı üzerinde önemli etkilere sahip olan geometrik büyüklüklerin parametrik olarak değiştirilerek akı bariyerlerine ait geometrinin optimizasyonu amaçlamaktadır. Geometrik değişimlere bağlı olarak motor performansı ve elektromanyetik parametreler, 2 boyutlu (2B) sonlu eleman analizleri (SEA) gerçekleştirilerek bilgisayar destekli olarak doğrulanmıştır. Başlangıç tasarımı ve optimize edilen tasarım için kullanılan büyüklüklerinin karşılaştırmalı olarak sunulduğu bu çalışmada tasarlanan motorlar 4 kutuplu, 48V, 500W ve 3000d/d anma değerlerine sahiptir.In recent years, due to their superior features, interior permanent magnet (IPM) motors are often preferred in traction applications such as electric vehicles. The rotor geometry of an IPM motor significantly affects motor performance. To improve the electromagnetic performance of the IPM motor such as maximum torque per ampere (MTPA), efficiency, and the torque pulsations, rotor and its flux barriers geometry have to be optimized due to the difficult modeling dominated by magnetic saturation. Thus, this study is focused on the optimization of flux barriers by varying the rotor geometric parameters which have significant influences. Performance and the electromagnetic parameters of the motor are verified by using 3D-Finite Element Method. The proposed motor has the following parameters; 4-pole, 48V, 500W and 3000rpm. Keywords: electric vehicles, finite element method, flux barrier, synchronous motor

FARKLI MIKNATIS MALZEMELERİNİN YÜZEY MIKNATISLI DOĞRUDAN TAHRİKLİ SABİT MIKNATISLI SENKRON MOTOR PERFORMANSINA ETKİSİ

In the present study, a 5.5 kW, 22 pole direct drive surface mounted PM synchronous motor (PMSM) has been designed, analyzed and optimized. After an initial design stage, a 3D model of the motor has been created for the finite element analysis. Cogging torque, output power, efficiency and maximum output power parameters have been analyzed for various material of PM magnets (Alnico, Ceramic, SmCo, NdFeB), which can be produced easily by rare-earth elements. In the performed analyzes, the best efficiency and the maximum output power value has been obtained on the N50m type magnet material. Furthermore, the lowest cogging torque has been obtained with an Alnico5 type magnet material.Bu çalışmada, 5,5 kW gücünde 22 kutuplu doğrudan tahrikli yüzey yerleştirmeli sabit mıknatıslı senkron motorun (SMSM) tasarımı, analizi ve optimizasyonu gerçekleştirilmiştir. Analitik tasarım aşamasını geçen motorun sonlu elemanlar analizleri için 3 boyutlu modeli oluşturulmuştur. Nadir toprak elementleri tarafından kolayca üretilebilen farklı sabit mıknatıs malzemeleri (Alnico, Seramik, SmCo, NdFeB) kullanılarak motorun vuruntu torku, çıkış gücü, verim ve maksimum çıkış gücü parametreleri incelenmiştir. Yapılan analizlerde, N50m tipi mıknatıs malzemesinde en iyi verim ve maksimum çıkış gücü değeri elde edilmiştir. Ayrıca, en düşük vuruntu torku Alnico5 tipi mıknatıs malzeme ile elde edilmiştir

Investigation Effects of Narrowing Rotor Pole Embrace to Efficiency and Cogging Torque at PM BLDC Motor

Engineers think that pole embrace size of a PM BLDC motor affects directly the efficiency and the torque. Dealing with theexperimental research, in the studywe have investigated the effects of narrowing rotor pole embrace step by step by changing sizes parametrically. By doing so, high efficiency and low cogging torque would have been obtained for a 20 W PM BLDC motor. In order to do this,pole arc to pole pitch ratio of magnets at the rotor poles has been changed parametrically (0.5 to 1) by genetic algorithm methodfirst. Then the electromagnetic field dispersions, output parameters of the motor, new rotor constructions have been obtained; and new pole embrace has been derived from the variation of pole arc to pole pitch ratio. We have also calculatedthe magnetic flux distribution, output power, torque, cogging torque and efficiency values analytically and the effects of new pole embrace to motor efficiency and torque have been simulated. The developed 18 slots, 6 poles, surface mounted inner runner configuration rotor machine is proposed as to be used insmall dentistry apparatus