A method for making an inductor and the product made therefrom

Abstract

A method for making an inductor comprises following steps: (a) preparing a magnetic core from a first magnetic component through cold pressing and moulding; (b) heating the magnetic core; (c) windingthe coil section of a wire around the heated magnetic core so that opposite bonded sections of the wire can extend in a direction opposite to the magnetic core from two opposite ends of the coil section; and (d), after the step (c), putting the wire wound magnetic core in a die, filling a second magnetic component in the die, and carrying out hot pressing moulding to form a magnetic shell that wraps the magnetic core and the coil section of the wire. The invention also provides an inductor prepared by the method mentioned above. The cold-press moulded magnetic core has the advantages of low relative magnetic permeability and high saturated current value. The hot-press moulded magnetic hell has high relative magnetic permeability and wraps the magnetic core and the coil section. The numberof turns of the coil section is not increased, the required inductance is reached, the heat caused by DC resistance is reduced, and the saturated current value is compensated at the same time.

Description

technical field [0001] The invention relates to a method for preparing a passive component, in particular to a method for preparing an inductor and its products. Background technique [0002] Passive components such as resistors, capacitors and inductors have been widely used in circuits of mobile electronic devices. Taking the magnetic core inductor in the aforementioned passive components as an example, it is an impedance coil used to weaken the high-frequency current in the circuit. Based on the characteristics of low impedance and high current resistance, the magnetic core inductor is often used in electronic The device's power supply. The basic structure of a conventional magnetic core inductor includes a magnetic core, a coil wound around the magnetic core, and a magnetic shell covering the magnetic core and the coil so that opposite ends of the coil are exposed to the outside. The above-mentioned magnetic core and magnetic shell were completed by cold pressing proce...

AI Technical Summary

Problems solved by technology

However, according to the inventor's research and development of the preparation method of magnetic core inductors for many years, although the relative permeability (relative permeability; μ r ) is low, so it has the characteristics of high saturation current value (saturation current; Isat); however, it needs to increase the number of winding coil turns under the premise of meeting the specified inductance value (inductance; L), which also produces high DC Impedance (DC resistance; DCR) and cause thermal problems of electronic equipment

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