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    IPT design with optimal use of spiral rectangular coils for wireless charging of e-tricycle scooters
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2022) Yıldırız, Emin; Kemer, Salih Burak; Bayraktar, Murat
    One of the most important research topics in wireless charging is the development of optimal coil pads. In this paper, an optimal inductive power transfer (IPT) system that meets the wireless charging requirements of an e-tricycle scooter has been designed. For an effective IPT design, the parameters such as resistance and inductance of the coil that affect the power transfer efficiency must be calculated correctly. The resistance and inductance calculation per winding has been taken into account instead of using the average winding dimensions of the primary and secondary pads due to the small size of the coils. The resistance and self-inductances of air-core spiral rectangular coils, and mutual inductance between them for a distance of 100 mm have been calculated with high accuracy using this method. Critical magnetic coupling factor, primary and secondary quality factors and maximum operating frequency have been considered as system stability criteria. The optimal IPT system that meets the criteria and uses minimum copper has been experimentally performed. The performance of the optimal IPT has been investigated firstly at equivalent AC load, and then resistive load by connecting the active rectifier to the secondary-side. The efficiency of DC to DC has been achieved as 89.2% in approximate load conditions.(c) 2021 Karabuk University. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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    Novel semi-analytical method for mutual inductance calculation of the thin spiral disk coils
    (Inst Engineering Technology-Iet, 2019) Yıldırız, Emin; Kemer, Salih Burak
    Accurate and fast calculation of the self and mutual inductance of coils is an important factor in system design and optimization for many applications. The methods of calculation mutual inductance between two spiral disk coils include elliptic integral solutions and coefficients in literature. In this study, a new semi-analytical method is proposed to calculate the mutual inductance between two thin disk coils without any coefficient and complex integral solutions. For this purpose, the circular winding is treated as polygonal winding with multiple edges. Unlike Grover's average diameter approach, the gaps between the turns of the coils and the diameter of the wire are included in the calculation. To observe the reliability of the method developed here, the mutual inductance between identical disk coils with an inner diameter of 10 and 20 cm were calculated using both methods. To confirm the accuracy of the proposed method, the experimental results are compared with two methods using the same coils. It is observed that the new method gives acceptable results (maximum error of 2.83%) especially at the distances equals to the inner radius. Consequently; this method is useful for the design of loosely coupled systems, such as wireless power transfer and pressure sensors.