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    This study introduces a novel ferrite core for power receiving coils (PRCs) in wireless power transfer (WPT) for capsule robots (CRs). The new design significantly improves power transfer efficiency (PTE) and reduces volume compared to traditional cores.

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    Area of Science:

    • Engineering
    • Materials Science
    • Robotics

    Background:

    • Wireless power transfer (WPT) systems for capsule robots (CRs) commonly use power receiving coils (PRCs) with ferrite cores to boost power transfer efficiency (PTE).
    • Traditional 1D hollow cylindrical ferrite cores face limitations in volume and performance enhancement due to high demagnetizing factors.

    Purpose of the Study:

    • To propose and validate a novel, lightweight, and more efficient ferrite core structure for PRCs in CR WPT systems.
    • To minimize the negative impact of demagnetization on PTE and enhance magnetic flux concentration.

    Main Methods:

    • Designed a novel PRC ferrite core structure using distributed cores and end covers.
    • Analyzed the influence of the new core on PTE and mutual inductance in WPT systems.
    • Simulated the relationship between ferrite core structure, demagnetizing factors, and effective permeability.
    • Fabricated and tested prototypes of PRCs with different core configurations.

    Main Results:

    • The proposed PRC design achieved a 24.4% volume reduction compared to traditional hollow cylindrical cores.
    • Demonstrated a 36% enhancement in performance, specifically in power delivered to the load (PDL) and PTE.
    • Structure-based optimization of demagnetizing factors was key to performance improvement.

    Conclusions:

    • The novel distributed ferrite core structure offers a significant improvement in WPT for capsule robots.
    • This design overcomes the limitations of traditional cores, enabling smaller and more efficient systems.
    • The findings support the development of advanced WPT solutions for miniaturized robotic applications.