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How to choose the speaker magnet

by AOMag | post a comment

When different electron energies are transmitted to the coil, the coil generates energy that interacts with the magnetic field of the magnet. This interaction causes the vibration of the tray. At the same time as the electronic energy changes, the speaker coil moves back and forth, the speaker tray follows, the movement will make the density of the air change, produce sound. The role of the magnet here is to help vibrate.

The magnets used in the speakers are: ferrite, neodymium nickel cobalt, neodymium iron boron.

NdFeB magnets are the core material of high-end loudspeakers, here is the precise sintering of NdFeB magnets. The magnetic properties of sintered NdFeB magnets are much higher than those of bonded NdFeB magnets, so use it to make the horn sound better. At the same time, neodymium iron boron magnets are also used for high-end headphones, this headset sound good, good elasticity, good detail, good sound field, sound field positioning accuracy.

In the application, ferrite magnetic performance is relatively poor, you need to have a certain volume to meet the driving force of the speaker, it is generally used in the larger speaker volume.

Out of the speaker's work environment, according to the temperature to choose the right NdFeB. For example, N (80 ° C), M (100 ° C), H (120 ° C), SH (150 ° C), UH (180 ° C), EH (200 ° C).

Each temperature, there are different magnetic points, such as N38, N40, N45, NdFeB magnetic NdFeB and the middle of the ferrite, but the two can work at 300 ℃ high temperature, so there are special requirements for high temperatures, Think about it. But the price is relatively expensive.

We say how many speakers, speakers say the diameter of the magnet, such as 100 magnets means that the magnet diameter is 100mm.

Speaker magnet is not as big as possible: the magnet points to high-density, low density, ferromagnetic, weak magnetic and other categories, if the speaker is low-density weak magnet, regardless of the effect is not good, bulky equipment up inconvenient. The same magnetic material, the larger the diameter, the greater the saturation magnetization, the greater the speaker power, the higher the speaker sensitivity, the better transient response.
If under the same conditions, the amount of magnetization, speaker power, sensitivity, transient expression is different. Therefore, it is not easy to think that the larger the diameter of the horn magnet, the better.

Magnetizing flux of rare earth magnetic materials (such as neodymium iron boron) is much larger than ferrite, so the use of neodymium iron boron magnets, do not need too much diameter. Therefore, NdFeB is mainly used for small speakers, such as car audio

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