ABSTRACT Conventional wound‐field synchronous machines (WFSMs) suffer from reduced reliability due to inherent issues such as mechanical wear and contact sparking associated with their carbon brushes. To overcome this limitation, this paper proposes a novel grooved disk coupler (GDC) based on CPT. Compared with typical rotary couplers such as the disc plate, cylindrical plate, and concentric ring type, this structure can achieve a higher coupling capacitance at a larger air gap, which can significantly enhance the power transmission capacity. Through finite element analysis, the performance of the GDC and the electromagnetic characteristics of the main motor were comprehensively evaluated. Utilizing the GDC as the core component, a wireless excitation system was developed and integrated into a 15 kW power generation experimental platform with a rated speed of 750 rpm. The experimental results show that at a transmission distance of 5 mm, when the equivalent rotor excitation winding resistance is 3 Ω, the system can achieve an output of 333 W of excitation power and a DC‐DC transmission efficiency of 66.93%. Furthermore, the experiment verified the effective regulation effect of the excitation current on the generator's output voltage by adjusting the excitation current and conducted tests under different excitation currents, rotational speeds, and load conditions. The results confirm that the proposed capacitive wireless excitation system successfully meets the excitation requirements of a 15 kW generator.
Sun et al. (2026) studied this question.
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