CN206921630U - Permanent magnet bias inductor - Google Patents

Abstract

A kind of band permanent magnet bias inductor, it is made up of iron core 1, biasing permanent magnet 2 and coil 3, there is one of space in its iron core 1, permanent magnet bias magnet 2 made of permanent magnet is inserted in space, caused magnetic flux Φ 1 is in opposite direction in the core 1 with the DC component by the pulsation alternating current in inductance coil 3 in the caused directions of magnetic flux Φ 2 in the core for permanent magnet bias body, and both cancel out each other.Inductor iron core is always worked near B-H loop central point, substantially increases the effective inductance amount of inductor, so as to reduce the volume and manufacturing cost of same inductance value inductor.

Description

PM Bias Inductor

technical field

The utility model relates to a filter inductor, in particular to a filter inductor working in a DC pulsating state.

Background technique

Inductors are one of the most commonly used electrical components. With the development of power electronics technology, the requirements for inductors are getting higher and higher, mainly in reducing volume, reducing costs, and increasing inductance. Inductors are basically composed of two parts: iron core and coil. The magnetic saturation in the iron core is directly related to the inductance of the inductor. The size of the iron core is also directly related to the weight and volume of the inductor. To reduce the volume and increase the inductance, a high-performance iron core must be used, which greatly increases the price of the product.

Utility model content

In order to solve the aforementioned problems, the utility model provides a new type of inductor, which can realize the characteristics of high performance and large inductance in the DC pulsation filter circuit, thereby reducing the volume and manufacturing cost of the same inductance inductor.

The utility model provides an inductor with a new structure, and its technical solution is an inductor with permanent magnetic bias, which is composed of an iron core 1, a bias permanent magnet 2 and a coil 3, and is characterized in that: the inductor iron There is a gap in the core 1, and a bias magnet 2 made of a permanent magnet is inserted in the gap. The direction of the magnetic flux Φ2 generated by the bias magnet in the iron core and the DC component of the pulsating alternating current passing through the coil 3 are in the iron core. The direction of the generated magnetic flux Φ1 is opposite, and the two cancel each other out.

The advantage of adopting the utility model is that the permanent magnet preset in the iron core will pre-generate a bias magnetic flux in the iron core, and the magnetic flux is generated by the current DC component in the pulsating alternating current passing through the inductance coil during operation. The magnetic flux of the magnetic flux offsets each other, ensuring that the magnetic working point of the iron core is always near zero, effectively preventing the iron core from entering the saturation region. For inductances of different powers, adjusting the thickness of the permanent magnet can achieve the preset value in the iron core. The strength of the bias magnetic field makes the iron core work at the state of maximum magnetic permeability, thereby greatly increasing the effective inductance of the inductor, and achieving the purpose of reducing the size and cost.

Description of drawings

Fig. 1 shows principle and structure of the present utility model, among the figure 1 is inductor iron core, 2 is inductor permanent magnetic bias body, 3 is inductor coil;

Fig. 2 is an inductor special example that the utility model is made with E-shaped iron core, and among the figure 1 is the inductor iron core, 2 is the inductor permanent magnetic bias body, 3 is the inductor coil.

detailed description

Please refer to Fig. 1 and show that the utility model adopts the annular iron core as the utility model inductor that the basic structure makes, and the annular iron core 1 in the figure has a groove at any position, inserts the permanent magnetic bias that permanent magnet makes in the groove Place the body 2, the coil 3 is wound on the iron core 1, the direction of the coil winding is to make the direction of the magnetic flux Φ1 generated by the DC component of the current passing through the coil and the direction of the permanent magnetic bias body 2 on the iron core when the inductor is working The direction of the magnetic flux Φ2 generated in it is opposite, and the two cancel each other out.

Fig. 2 is the inductor that the utility model adopts the common E-shaped iron core of inductor to make, leaves a gap in the middle of the main magnetic circuit of the iron core, inserts the permanent magnetic bias body 2 in the gap, and the coil is wound on the core of the iron core. An inductor with permanent magnetic bias is formed on the core post, and its permanent magnetic bias body can also be located at any position in the iron core magnetic circuit.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modification without technical improvement, equivalent replacement, etc. within the spirit and principles of the present utility model shall include Within the protection scope of the present utility model.

Claims (1)

1. A permanent magnet bias inductor, which is made up of iron core (1), bias permanent magnet (2) and coil (3), is characterized in that: there is a gap in the inductor iron core (1), in the gap A permanent magnet bias magnet (2) made by inserting a permanent magnet in the core, the direction of the magnetic flux (Φ2) generated by the permanent magnet bias magnet in the iron core and the DC component of the pulsating alternating current passing through the inductance coil (3) are in the iron core The direction of the magnetic flux (Φ1) generated in (1) is opposite, and the two cancel each other out.