Misalignment tolerance is critical for inductive power transfer (IPT) systems. This paper introduces an innovative asymmetric coupler based on an I-shaped magnetic core structure, significantly improving output voltage stability under horizontal and vertical displacements. Unlike conventional cubic magnetic cores, the I-shaped core enhances flux concentration by enlarging its ends while narrowing the middle section, effectively reducing the demagnetization factor and boosting magnetic focusing capability. The design optimization process for minimizing the demagnetization factor is thoroughly analyzed. Comparative experiments with traditional cubic-core asymmetric couplers demonstrate the proposed structure’s superior magnetic coupling and misalignment resistance. Experimental results show that the I-shaped core IPT system achieves a 23% lower output voltage fluctuation and 5% higher efficiency compared to its cube core counterpart.
Xu et al. (Sun,) studied this question.