Clean and safe energy transmission with magnetic applications!
Manufacturing (Saitama University Research Seed Collection 2025-27 p.48)
Keywords: Wireless power transfer, contactless power supply, electric mobility, EV, welding robots, electrical equipment, power electronics, arc welding.
Electric devices and power electronics technology are one of the fields that Japan can be proud of. Among them, wireless power transfer, which is gaining attention with the spread of electric vehicles (EVs), is a technology that can safely transmit energy regardless of contact failure. The principle involves a transformer with a large air gap, where alternating current is passed through the primary coil to generate a magnetic flux, which is then transmitted to the secondary coil to induce electromotive force (electromagnetic induction). By using an alternating power source with a frequency of several tens of kHz or higher and connecting appropriate resonant capacitors to both the primary and secondary coils, energy transmission can be achieved with over 90% power efficiency. In our laboratory, we have published numerous papers on theoretical analysis of input-output characteristics and maximum efficiency conditions, as well as comparisons of power transfer characteristics with various coil shapes. We are particularly focused on developing wireless charging systems that are effective for electric mobility such as EVs. Additionally, we are conducting research on the advancement and intelligence of welding equipment, including high-performance arc welding robots that utilize external magnetic fields as a magnetic application.
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Yasuyoshi Kaneko, Professor Graduate School of Science and Technology, Department of Mathematical and Electronic Information, Field of Electrical and Electronic Physics 【Recent Research Themes】 ● Development of a wireless charging system for electric mobility during operation ● Research on methods to reduce leakage magnetic fields during high-power wireless power transmission ● Development of wireless power outlets and application of non-contact power supply technology to industrial robots ● Stabilization of arc welding through external magnetic field control (such as ceramic blowing and clean MIG welding) ● Development of a support system for welding technicians (AI management of work information and application to skill education)
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【Appeal Points to the Industry】 ● Theoretical analysis supporting various resonant capacitor methods useful for wireless power transfer system design ● Development achievements in high-efficiency and miniaturizable wireless power transfer through magnetic field analysis software and actual device production ● Research and development of power supply systems for electric vehicles (EVs) and electric assist bicycles during parking and while in motion ● Research and development utilizing external magnetic fields for arc welding ● Numerous patent applications filed 【Examples of Practical Application, Case Studies, and Utilization】 ● Practical development of wireless charging transformers for parked and in-motion EVs (NEDO grants, etc., 2009 - 2021) ● Bidirectional wireless power transfer system (NE Japan Wireless Technology Award 2013) ● Development of wireless power transfer transformers for electric assist bicycles used in bike-sharing systems (2014 - 2018)
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Various wireless power transfer transformers developed
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.