Application of neodymium iron boron magnet in loudspeaker

Speaker box is one of the raw materials of electro acoustic equipment. The basic material for manufacturing speaker box is rare earth neodymium iron boron permanent magnet material. Speaker box magnets are generally called speaker magnets.

Speaker box is one of the raw materials of electro acoustic equipment. The basic material for manufacturing speaker box is rare earth neodymium iron boron permanent magnet material. Speaker box magnets are generally called speaker magnets.

Working principle of speaker box

#Neodymium iron boron permanent magnetic material # obtains an electromagnetic field in the annular magnetic density of the equivalent circuit according to the yoke, and the voice coil connected to the speaker paper basin is inserted into the annular magnetic density. The permanent magnet material is surrounded by the external magnetic yoke, thus reducing the influence of the external stray electromagnetic field. On the contrary, it can reduce the influence of electromagnetic field of permanent magnet materials. When the sound is generated according to the electromagnetic field in the form of electric current, it will cause an electromagnetic coil. Because of the change of the current value, it will bring different types of vibration frequencies, and then push the paper basin to emit different types of times and obvious sounds. Using rare earth neodymium iron boron magnets instead of traditional ferrite cores or alnico magnetic fields can not only improve the sensitivity of speakers, but also greatly reduce the total number of commonly used magnetic fields.

Magnet in loudspeaker

Two kinds of permanent magnetic materials commonly used in speakers are neodymium iron boron magnets and ferrite cores. All three are strong, but they have their own unique functions.
The advantages of neodymium iron boron are high cost performance and good physical properties. The main disadvantages are low Curie temperature, poor temperature characteristics, easy delamination and etching.
The manufacturer of bottom tone mobile phone earphone speaker must adjust its composition and improve it by surface treatment. Only in this way, manufacturers of mid high tone mobile phone earphone speakers can meet the needs of practical applications.
Neodymium iron boron belongs to the third generation of rare earth permanent magnets. It has the characteristics of small size, light weight and high magnetic belt. It is a magnetic field with a strong performance price ratio, which is called the first in the magnetic field industry.
The advantage of high energy density makes neodymium iron boron rare earth permanent magnets widely used in industrialization and automation technology.
Speaker magnet (speaker magnet)
Ferrite core is a kind of hydroxide with ferromagnetic material.
In terms of electrical performance, the resistance of ferrite core is much higher than that of metal materials and aluminum alloy permanent magnet materials, and it also has high dielectric properties.
The belt magnetism of permanent ferrite also shows relatively high permeability at high frequencies.
Therefore, ferrite magnet has become a non-metallic permanent magnet material widely used in the field of high frequency and weak current flow.
Ferrite magnet is a kind of non-metallic permanent magnetic material. This is a composite oxide of magnetic ferric oxide and one or more individual hydroxides, which is generally used for speakers and other musical instruments.