Abstract:In this study, an EI core linear actuator is proposed for horizontal movement systems. It is a transverse flux linear switched reluctance motor designed with an EI core structure geometrically. The actuator is configured into three phases and at a 6/4 pole ratio, and it has a stationary active stator along with a sliding passive translator. The stator consists of E cores and the translator consists of I cores. The actuator has a yokeless design because the stator and translator have no back iron. The E and I cores are separated from each other to provide a fault-tolerant design and decrease the weight. The proposed model is analyzed by 3D finite element method. Phase inductance, flux linkage, and axial forces are examined by magnetostatic finite element analysis and verified by analytical approximations and experimental results. Under DC 8 A phase excitation, propulsion force is 72.57 N and corresponding power consumption is 115.5 W. This has advantages for horizontal movement systems.
Elevator traction motors are critical components of elevator systems. After the structural analysis of the traction motor, it is necessary to proceed to the production processes for the comfortable and safe use of elevator systems. In this study, the static load values for bearing lifetime calculation, belt selection, and finite element analyses (FEA) were determined. According to calculated loads; materials, bearings, belt, pulley, brake, and encoder were selected. In order to obtain a design in accordance with elevator standards, motor parts were examined for structural analysis. Finite element analyses were carried out according to the determined maximum static load values, and a new belt elevator traction motor design that provides the safety coefficients has emerged. When the FEA analysis results of bending moments are examined; the maximum Von Mises stress acting on the motor frame and shaft was obtained 17.1 MPa and 27.62 MPa respectively. The maximum Von Mises stress was obtained under the torsional moment as 71.4 MPa and the shaft is 6.1 times safe against a torsional moment. This value is the minimum safety factor of the designed system and safety factors of bending moments are higher than this value. The designed elevator machine has got 12.9 kW rated power, 1.6 m/s cabin speed, and 1175 kg carrying capacity. The advantage of the proposed design is to eliminate the casting process with modular structure via double side belt system. The prototype of the designed motor was produced and it was observed that the motor provided the desired constraints as a result of the loading experiments.
Fotovoltaik (FV) sistemlerin ilk kurulum maliyeti yüksek iken genel sistem verimliliği düşüktür. Bundan dolayı kurulan sistemin maksimum verimlilik ile çalışması hedeflenmektedir. Verimliliği etkileyen unsurlardan biri de panel yüzeyinin toz/kar/kirlenme gibi çeşitli nedenlerle kaplanmasıdır. FV panele gelen ışınların geçmesine engel olan bu durumlarının giderilmesi için bir süpürücü mekanizma tasarlanmış ve tahrik elmanı olarak kullanmak üzere Doğrusal Fırcasız Dogru Akım Motoru (FDAM) tasarımı yapılmıştır. Doğrusal FDAM'nin Sonlu Elamanlar Yöntemi (SEY) ile magnetostatik ve statik stres analizleri yapılmış ve tasarıma ait sonuçlar elde edilmiştir. Sonuçlar tasarlanan Doğrusal FDAM sistem için gerekli kuvveti üretebildiğini göstermiştir. Ayrıca sistem için öngörülen enerji tüketim hesabı yapılmıştır. Doğrusal FDAM'nin süpürücü mekanizması ile yapacacağı enerji tüketiminin, sistem verimliliğine etkisinin yanında çok düşük kaldığı sonucuna ulaşılmıştır.
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