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EnglishMagnetic rod inductors are commonly used in AC filter parts of power transformers. Why do ferrite magnetic rods have high saturation current, but ferrite magnetic rings do not?
Since the saturation current of the magnetic bar inductance is high, why do the energy storage inductors use iron powder cores and iron-silicon-aluminum magnetic rings instead of magnetic bars?
Because the magnetic path of the magnetic bar inductance needs to go through a long gas section, the gas reluctance is too large, the energy is dense, and the gas magnetic circuit is not easy to be saturated. The magnetic circuit of the ferrite magnetic ring is all completed by ferrite, which has a small magnetic resistance, and the advantage is that it is easy to obtain a large capacitance, but the magnetic energy will be saturated when the magnetic energy is concentrated in the ferrite.
In order to get rid of the defect that the inductance of the magnetic bar inductance is small, and to resist saturation, the compromise is iron powder core and iron silicon aluminum material.
The addition of a magnet bar to a power line passing through it is equivalent to expanding the power line's capacitance by a certain level, which is also similar to capacitance.
The magnet bar has a high loss index, which can convert high-frequency electromagnetic kinetic energy into heat energy according to eddy currents, and then control the passage of high-frequency signals. It should be a loss filter.
The usual inductance is to change the electromagnetic energy into a magnetic field and store it.
The production of the inductance is fundamentally about the selection of the magnetic rod. The following will analyze the use of the magnetic rod inductance and the difference between it and the magnetic ring inductance.
manganese zinc bar
This magnetic bar is a soft magnetic bar with high initial permeability, low surface resistance, and the higher the initial permeability, the lower the surface resistance, so it is generally used in circuits below 1MHz.
The main purpose:
The initial magnetic permeability of this material is usually within 3000~3500, with high saturation magnetic flux density and low loss, it is one of the ideal power inductor magnet bars around 150KHz; it is generally used for common mode inductors of magnet bars, etc.
Anti-EMI ferrite: EMI material absorbs electromagnetic kinetic energy by means of magnetic loss and electrical loss to absorb interfering radio waves, so it is usually specified to have a higher impedance outside the condition of 12~150MHz, usually used for magnetic beads; frequency selection filter inductor : This type of material usually specifies low loss, low temperature index, high Curie temperature, good high frequency characteristics, etc., and is usually used for color ring inductors.
Choke inductance and power inductance: The magnetic bar is usually specified with the characteristics of large saturation magnetic flux and Curie temperature, and is usually used in magnetic bar inductance and some I-shaped inductance axial inductance.
The I-shaped inductor is a kind of plug-in inductance. The I-shaped inductor is one of the electronic components that we often see in plug-in operations; it is an electromagnetic induction component composed of an I-shaped magnetic core skeleton and an enameled copper wire. . Mainly in the skeleton shape of the I-shaped inductor, the coil is wound in the slot. The two ends of the coil are connected to the pins, and tin is plated to ensure that the two pins of the coil are well welded, and a protective sleeve is wrapped outside to form an I-shaped inductor.
Plug-in inductance is a general term including plug-in I-shaped inductance, plug-in color ring inductance, magnetic rod inductance, magnetic ring inductance, I-shaped choke inductance, filter transformer and so on.
The plug-in inductance has low cost, large volume, wide inductance range, and complete types. It is more suitable for products with large built-in circuit boards in product space.
