Provision of transmission of a given power in the system of contactless charge of underwater vehicle batteries

The object of the research is a high-frequency power transformer with separating primary and secondary parts making up a system of contactless power transmission at the autonomous unmanned underwater vehicle (AUUV) for charging its storage batteries. As a research task a delivered justification and development of a methodology for calculating the design parameters of a transformer meeting the delivered requirements for the transmitted power under specified operating conditions is provided. The research is based on a mathematical modeling of electromagnetic processes in the transformer performed in the software package ANSYS Maxwell combined with a live experiment. The characterizing parameters in the form of the magnetic coupling coefficient and the specific inductance of the coil winding turn are identified and their application for the complete identification of the object properties is justified. A system of relative units is proposed in which the characterizing parameters have a constant value for any cores of the same size which makes it easy to scale the results of the received technical solutions when the requirements for the transmitted power change. A method is proposed for determining approximate polynomials connecting arrays of values of the coupling coefficient and specific inductance with the relative values of the gaps between the contact surfaces of the transformer parts and the inter-axial displacements which may possibly occur when the underwater vehicle is automatically moored to the base. The performed studies made it possible to propose a technique for calculating the basic design parameters of the transformers with the initial data in the form of a combination of the specified electrical characteristics and the limitations imposed on the accuracy of the docking of the contact surfaces of the transformer parts. Experimental studies of selected transformer constructs similar to those adopted in the modeling confirm the reliability of the results presented. The results obtained relate to cup-type ferrite cores, but the approaches adopted in the studies make it possible to extend the calculation technique to other transformer designs that can be used in the systems of AUUV contactless battery charging.