Speaker speaker is one of the raw materials of electro-acoustic equipment. The basic material for the production of speakers is rare earth NdFeB permanent magnet material. Speaker speaker magnets are generally called audio horn magnets.
How speakers work？
According to the yoke, the electromagnetic field is obtained in the annular magnetic density of the equivalent circuit, and the voice coil connected with the speaker cone is inserted into the annular magnetic density. The permanent magnet material is surrounded by the external yoke iron, thereby reducing the influence of external stray electromagnetic fields. Instead, it can reduce the magnitude of the effect of the electromagnetic field produced by the permanent magnet material. Solenoid coils are created when sound responds to an electromagnetic field in an electric current manner. Because of the change of the current value, it will bring different types of vibration frequencies, and then push the paper cone to send out different types of times and obvious sounds. The use of rare earth NdFeB magnets instead of traditional ferrite cores or AlNiCo magnetic fields can not only improve the sensitivity of the speaker, but also greatly reduce the total number of commonly used magnetic fields.
magnets in speakers
Two kinds of permanent magnet materials commonly used in speakers are NdFeB magnets and ferrite cores. All three are strong, but have their own distinctive effects.
The advantages of NdFeB are high cost performance, good physical properties, but the main disadvantages are low Curie temperature, poor temperature characteristics, easy delamination and corrosion.
The manufacturer of the bottom-tone mobile phone headphone speaker must adjust its composition and use the surface treatment method to improve it. Only in this way can manufacturers of mid-range and high-pitched mobile phone earphone speakers meet the needs of practical applications.
NdFeB belongs to the third generation of rare earth permanent magnets. It has the characteristics of small size, light weight and high magnetism. It is a magnetic field with a strong performance-to-price ratio, and is known as the first magnetic field in the magnetic field industry.
The advantage of high energy density makes NdFeB rare earth permanent magnets widely used in industrialization and automation technology.
Speaker magnet (audio speaker magnet)
A ferrite core is a hydroxide with a ferromagnetic material.
In terms of electrical properties, the resistance of ferrite cores is much higher than that of metal materials and aluminum alloy permanent magnet materials, and it also has high dielectric properties.
Magnetically charged permanent ferrites also exhibit relatively high permeability at high frequencies.
Therefore, ferrite magnets have become non-metallic permanent magnet materials widely used in the field of high frequency and weak current.
Ferrite magnet is a non-metallic permanent magnet material. This is a composite oxide with magnetic ferric oxide and one or more other hydroxides, which is commonly used in cabinet speakers and other musical instruments.