Maximising power transfer efficiency (PTE) in resonant inductive power transfer (IPT) systems requires strong coupling between transmitter and receiver coils. In applications where system constraints yield a weak inductive link (e.g.: significant distance between coils.) or there is a requirement for a specific power level, then geometrically optimising the coils can enhance inductive linkage. To achieve this, a novel coil design method has been presented which provides maximum efficiency for both strongly-and loosely-coupled inductive links. A parameter (i.e.: Strong Coupling Factor.) has been introduced to assist the design procedure. Discussed results from a practical 1.06 MHz inductive link, developed using the proposed design method, show that with proper selection of strong coupling factor (e.g.: C = 220.) the designed coil geometry can provide maximum PTE of 86%, which is in close correlation (≈ 3%) with theoretical analysis using MATLAB. Index Terms-Wireless power transfer (WPT), inductive power transfer (IPT), resonant coupling, electromagnetic induction, near-field communication.

A design technique for optimizing resonant coils and the energy transfer of inductive links. IEEE transactions on microwave theory and techniques [online], Early Access.

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This paper presents a novel control approach to obtain asymptotic attitude stability of a quadrotor as a representative of Planar Vertical Take Off and Landing (PVTOL) Unmanned Aerial Vehicles (UAVs). The considered quadrotor is a symmetric VTOL-UAV with four rigid mono-directional propellers, which has been modeled based on quaternion representation with taking Coriolis and gyroscopic torques into account. In the proposed approach, two nearly equivalent control laws (model independent as well as model dependent) have been used to obtain exponential stability of attitude angles and asymptotic stability of attitude angular velocity of the quadrotor UAV. The proposed approach also presents how the attitude parameters i.e. attitude angles and attitude angular velocity can be quickly regulated to their desired values as required.

Vital inspection and repair operations on subsea pipelines usually involve pipe-bore robots, which must be controlled and monitored from outside the pipe. In many situations cables cannot be connected to the in-pipe robot and duplex wireless communication through pipe-wall is the only solution. Wireless power transmission (WPT) through pipe-wall has been considered to facilitate the required duplex communication. In WPT through subsea pipe-walls the conductive media (i.e.: stainless steel and seawater.) will significantly reduce the power transfer efficiency (PTE) of the system. This paper proposes a coil geometry optimisation methodology to boost PTE of these wireless communication systems. The proposed technique, in addition to increasing the PTE improves the overall system's signal to noise ratio by reducing the coil antenna's internal resistance.Index Terms-Resonant magnetic induction, power transfer efficiency, inductive power transfer, power transfer throughmetal .