Thermal analysis and improvements of wireless power transfer coils by using thermoelectric materials and spin seebeck effect

Name: Farooq, Umar

keyword: Wireless power transfer

; Electric vehicle

; Thermal

; Spin seebeck effect

Abstract: A system that transmits conduction of electrical power from a source to a load without a physical connection is said to be one using wireless power transmission, or WPT. Wireless power transmission becomes more prevalent, there are growing demands associated with it. As the charging capacity rises, system losses also increase, posing significant risks to the system's components. This is particularly concerning when dealing with currents in the hundreds of amperes within the kHz frequency range, as both the electrical energy from induction currents and the thermal energy from induction heating can pose hazards in the surrounding area. Because of heat generated by the ferrite cores and windings, the high power transmission causes an insulating coating layer of Litz wires to melt on both the gearbox and receiver sides. For this reason, the transmission's coils necessitate a cooling structure as well as for receiver side, or to deposit materials having good thermal as well as conductive properties such as thermoelectric materials which convert thermal energy into electrical energy utilizing the Seebeck and Peltier effects can be utilized in highly efficient cooling and refrigeration, energy harvesting, sensing, and thermoelectric power systems. In this research work, the static WPT system is established and tested for thermal condition with the wafer of Silicon above cobalt attached with the copper wiring which shows reduction in the temperature of the magnetic coupler as well as shows that the thermal does not affect the efficiency of the system but it will eventually damage the other components of the system which disturbs the stability of the system.The results in a significant reduction in temperature 21-23% in this case, improving the overall efficiency and reliability of the wireless power transmission system. A multilayer structure of ferromagnetic materials is introduced which is expected to amplify Anomalous Nernst effect (ANE) and Spin Seebeck effect (SSE). The material fabrication of [YIG/Co]5 multilayers is done by the sputtering technique. The (2) Cobalt (Co) of 10nm in size is coated on Yttrium Iron Garnet (YIG) of 100nm and repeatedly stacked (n=1-5) on a Si substrate. Results show that the ANE+SSE in [YIG/Co]5 multilayers are enhanced by about 79.6% between one and five layers. An analysis is also being performed in which the samples of [YiG/Co]3 are placed above the coil and due to the SSE, a clear reduction in the temperature of the coil can be observed. This multilayer structure can be utilized for thermoelectric devices and to enhance the efficiency of wireless power transfer (WPT) coils. An analysis is performed by using a heat sink as well as a thermoelectric cooler on the backside of the coils and the results show an improved thermal performance from 63c to 54c and then with both the components i.e., Heat sink and thermoelectric cooler to 48c by dissipating heat from coils into the air so that the efficiency of the components in the system remain stable and work appropiately.

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Wanchai Pijitrojana

Role: advisor

Created: 2024

Modified: 2024-11-25

Issued: 2024-11-25

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2023.522

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Engineering

Grantor: Thammasat University

©copyrights Thammasat University

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