The role of Faraday ring in speaker
Faraday ring can be called copper ring or shorting circuit ring. Playing an important role in the magnetic circuit system of the speaker.
Component materials: Copper is common, but any conductive material such as aluminum or iron can be used instead. Even conductive magnets, conductive magnetic materials, neodymium iron boron, aluminum nickel cobalt, etc. Can be used as shorting-circuit rings. Copper is electroplated in places such as the T-yoke and the magnetic gap, which can also be regarded as a shorting circuit ring. The effect varies with the conductivity, the higher the conductivity, the better the effect.
Installation position: It can be placed on top of the T-yoke, on the bottom of the T-yoke, above the magnetic gap, below the magnetic gap, and inside the magnetic gap.
Shape: a ring, or a large cylinder, used to sleeve on the T-iron or in the magnetic gap. A part of the copper ring can be extended for heat dissipation. The copper cap on the top of the T-yoke can also be regarded as a shorting circuit ring. The copper phase plug on the T-yoke is also a short-circuit ring. Winding with enameled copper wire, connecting the head and tail of the wire, can be used as a shorting-circuit ring, but the number of winding turns should be enough to have a good effect.
Effect principle: The magnetic field of the Faraday ring and the magnetic field of the voice coil are cross-linked and interact. When the voice coil is energized. A magnetic field is generated, and the magnetic field is constantly changing. As a transformer, the Faraday ring will generate an induced current due to electromagnetic induction. This current flowing in the Faraday ring will also generate its own magnetic field, which cancels the AC electromagnetic field generated by the voice coil. Therefore, the magnetic field of the magnetic gap does not change much. To stabilize the magnetic field of the magnetic gap. So the lower the shorting-circuit ring resistance, the better. Superconducting materials are the best materials. The use of superconducting materials can make the total magnetic field of the magnetic gap stable and not easy to change. Among common materials, copper performs better than aluminum and iron. The material thickness is the thicker the better. There is also a better effect inside the magnetic gap than outside the magnetic gap.
When the magnetic field is stable, the nonlinear distortion is greatly reduced. Especially second-order distortion. For the effect of stabilizing the magnetic field, when the voice coil and the Faraday ring are interactively connected, the high frequency performance is better. But if you want to perform better at low frequencies, you need to use a thick copper Faraday ring. Only when the induced electromotive force of the Faraday ring is large and the induced current is large, the alternating magnetic field of the voice coil can be largely offset. Therefore, a good Faraday ring needs to be accurate enough to use millimeters to calculate the thickness. Therefore, the use of high-quality copper rings for top speakers requires a greater cost. This is the reason why low-end speakers cannot use Faraday rings.
The effect of the Faraday ring is also to reduce the inductance of the voice coil. In a magnetic circuit system with Faraday rings. When the alternating current of the voice coil changes, the total magnetic field cannot change greatly. The inductance of this voice coil will decrease. So that the sensitivity of the speaker is improved.
When a copper Faraday ring is added to the magnetic gap, the copper content of the magnetic gap increases. The contact area of copper becomes larger. As a result, the current induced magnetic field, conductivity and permeability and magnetic flux increase. Increase the sensitivity of the speaker. The sensitivity of the speaker can be improved without increasing the speaker motor.
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