Browsing by Author "Cilingir, C"

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    Production and Characterization of Highly Conductive Aluminum Metal for Electric Motor Applications
    Yavas, A; Cilingir, C; Turk, A; Celik, E
    The aim of this research is to produce and develop high-conductive and non-magnetic Al-based materials used in industrial rotors to reduce rotor conductor losses and increase motor efficiency. To achieve this, ETIAL 7 Al metal was melted together with AlB2 and AlB12 inoculant materials at individually added proportions (ranging from approximately 0.025-0.300%) using an induction melting furnace. The removal of boron from Al metal was achieved by the interaction of boron with impurity elements at high temperatures and the formation of borides. Low-density metal borides precipitated into slag and high-density metal borides precipitated at the bottom of the molten metal in the induction furnace. As a result, the metal was rendered non-magnetic and its conductivity increased by removing impurity elements in the Al metal. After the casting process, the metal underwent heat treatment to obtain certain textures in the structure, which further enhanced its conductivity at desired directions. The elemental analysis, phase structure, chemical state, microstructural, electrical, and magnetic properties of the produced Al materials were characterized by using OEM, XRD, XPS, SEM-EDS, IA, and VSM. This study has successfully produced extra-high-conductivity and non-magnetic materials with an innovative approach, without changing the system, and in a cost-efficient manner compared to the current situation. These materials can be used to increase the efficiency of electric motors.
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    Influence of Inoculation and Texture on Enhancing Electrical Conductivity in Commercially Pure Aluminum for Squirrel-Cage Asynchronous Electrical Motors
    Cilingir, C; Turk, A; Yavas, A; Yigit, R; Celik, E
    This research focuses on manufacturing and applying highly conductive and non-magnetic aluminum-based materials in rotor construction to reduce conductor losses and increase motor efficiency. The process involves using an electric melting furnace to melt aluminum-boron (Al-B) master alloys at various rates along with 99.7% pure Al and impurities. During melting, the boron reacts with impurity elements in the Al, forming borides that are removed as slag. This interaction removes impurities, eliminating the magnetic properties of the Al and increasing its conductivity. The melted metal is then cast and subjected to heat treatment to achieve desired textures in their structure, further enhancing conductivity in specific directions. The outcome of this study is the production of extra-high-conductivity and non-magnetic materials through an innovative approach that does not require system changes or increase costs compared to current methods. The Al-3B master alloy and heat treatments significantly improve electrical conductivity in aluminum by enhancing metal orientation to (110) and eliminating structural defects. Heat treatments at 400 degrees C for 2 and 4 hours are most effective. These processes also reduce magnetic characteristics, resulting in improved rotor efficiencies in motor performance.