A kind of winding method of braided coil

Abstract

The invention provides a winding method of a braided coil, belongs to the technical field of the magnetic field coupling type wireless electric energy transmission, and especially relates to a windingmethod of the braided coil. The problem that the quality factor is reduced when the eddy loop is formed between the coil turns, the inter-turn proximity effect is large, the coil AC internal resistance is large, and the working efficiency is high in the magnetic coupling type wireless electric energy transmission system is solved, and the Litz wire is used for winding. The winding method is mainly used for winding the braided coil of the magnetic field coupling type wireless electric energy transmission system.

Description

technical field [0001] The invention belongs to the technical field of magnetic field coupling wireless power transmission, and in particular relates to a winding method of a braided coil. Background technique [0002] Magnetic field-coupled wireless power transmission uses magnetic fields to realize wireless power transmission. It has the advantages of safety, convenience, and high efficiency. It is widely used in charging and power supply for portable mobile devices, electric vehicles, rail transportation systems, and rotating equipment. [0003] The core of the magnetic field coupled wireless power transfer system is the primary and secondary coils (transmitting and receiving coils) coupled by the magnetic field. Its principle is similar to that of a loosely coupled transformer. Voltage, so as to realize the wireless transmission of electric energy. [0004] Due to the extremely small coupling coefficient of the primary and secondary coils, there is a large amount of rea...

AI Technical Summary

Problems solved by technology

[0004] Due to the extremely small coupling coefficient of the primary and secondary coils, there is a large amount of reactive current in the primary and secondary coils during the power transmission process. At the same time, affected by the AC skin effect and the proximity effect, the AC internal resistance of the coil is greater than the DC internal resistance, and the power on the coil The loss is large. In order to ensure the efficiency of power transmission, the traditional method is to use Litz wire and multi-strand insulated enameled wire to wind the coil below 2MHz to eliminate the AC skin effect. By increasing the inter-turn spacing of the coil, the proximity between the turns of the coil is reduced Effect, at higher frequencies, using spider web or flower basket winding method to reduce the proximity effect between coil turns, but increasing the coil inter turn spacing will lead to a substantial increase in coil size, while spider web or flower basket winding methods cannot theoretically Completely eliminate interturn eddy current caused by proximity effect

Images