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Magnetic core installation principle of magnetic ring inductance and application on wire
Jul 12, 2018

Magnetic core installation principle of magnetic ring inductance and application on wire

The magnetic ring is not selected or installed, and the magnetic ring inductance does not reach the anti-interference effect that it should have, which causes serious damage to the equipment. So, what are the principles for the installation of the magnetic core?

1. When choosing a magnetic ring, try to choose a long length. The thicker the thickness, the tighter the combination of the aperture and the cable that passes through.

2. The installation position of the magnetic ring should be as close as possible to the interference source, that is, it should be close to the entrance and exit of the cable.

3. When the low-frequency end is disturbed, it is recommended that the cable be wound around 2~3匝. When the high-frequency end is disturbed, it cannot be bypassed (because of the existence of distributed capacitance), choose a longer magnetic ring.

The field of application of magnetic rings is extensive, but there is a fixed principle regardless of the use of any wire:

The anti-interference magnetic ring installed on the wire harness is basically divided into two types, one is a nickel-zinc magnetic ring, and the other is a manganese-zinc magnetic ring. Because of their different materials, their respective roles are different (see: the difference between manganese zinc and nickel zinc in ferrite magnetic ring inductance). MnZn ferrite has the characteristics of high magnetic permeability and high magnetic flux density, and has a lower loss characteristic at frequencies below 1 MHz. Nickel-zinc ferrite has characteristics such as extremely high resistivity, low magnetic permeability of less than several hundred, and low loss at frequencies higher than 1 MHz. The magnetic permeability of MnZn ferrite ranges from several thousand to tens of thousands, while the nickel zinc ferrite is between several hundred and thousands. The higher the magnetic permeability of the ferrite, the higher the impedance at low frequencies and the lower the impedance at high frequencies.

In summary: In the suppression of high-frequency interference, nickel-zinc ferrite should be used; otherwise, manganese-zinc ferrite is used. Or put manganese Zn and nickel zinc ferrite on the same cable at the same time, which can suppress the interference band is wider. The larger the difference between the inner and outer diameters of the magnetic ring, the larger the longitudinal height, the greater the impedance, but the inner diameter of the magnetic ring must be tightly wrapped to avoid leakage.

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