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In this paper, we propose a novel machine that transfers electrical energy between the stator and the rotor via magnetic resonance coupling (MRC). As the energy conversion in an MRC does not require any magnetic core, its mechanism realizes an ultra-lightweight motor for potential use in an energy-efficient electric aircraft. The MRC-based motor, its design, operating principles, starting characteristics, and resonance conditions are discussed in detail herein. Through magnetic analysis, we clarify the essential characteristics of the proposed MRC motor and verify the resonance conditions calculated from the equivalent circuit. Our results confirm that the proposed MRC motor transfers electrical energy between the stator and the rotor, thereby generating torque. We further verify that the resonance conditions derived from the equivalent circuit achieve a resonant state. Kenta Takishima (Student Member) received a B.Eng. degree from Toyo University, Japan. He is enrolled in the course of Electricity, Electronics and Communications at the Graduate School of Science and Engineering, Toyo University as of 2017. His technical efforts include the research of high-performance machines for electric aircraft and vehicles, and energy conversion systems. Kazuto Sakai (Senior Member) received a Dr. Eng. degree from Yamaguchi University, Japan. He worked at Toshiba Corporation, Power and Industrial Systems Research and Development Center from 1983 to 2010, where he developed an AC motor drive technology for servomotors, railroad, and hybrid vehicles, and superhigh-speed generators for cogeneration. He joined Toyo University in 2010 as a professor in the department of Electrical, Electronic and Communication Engineering. His technical efforts include the research of energy conversion and power electronics, high-performance PM motors and induction motor drives for electric vehicles and railways, and wireless power transfer using electromagnetic resonant coupling.

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