First of all, we still understand the concept of the magnetic separator: the magnetic separator material uses the electron scattering caused by the thermal motion of the functional component lattice electric field and the interaction between the electrons and the electrons to absorb electromagnetic wave energy and convert it into heat energy. In order to achieve different shielding effects in different situations, we can choose different thickness materials and different performance magnetic sheets.
The microwave absorbing material factory elaborated on the production requirements of the magnetic isolation sheet:
(1) The requirements for magnetic sheets are: excellent magnetic properties and high permeability;
(2) The magnetic loss of the magnetic sheet in the AC magnetic field is small;
(3) The magnetic sheet has good flexibility, and will not break when it is attached, otherwise it will cause magnetic flux leakage.
The main function of the magnetic separator:
(1) EMC (shielding, absorption, suppression)
The absorbing material is a kind of functional composite material that mainly absorbs electromagnetic waves, which eliminates the back and forth reflection of electromagnetic waves in the shielding cavity, reduces the interference of clutter to its own equipment, and effectively prevents electromagnetic radiation from harassing and harming surrounding equipment and personnel. An advanced method to eliminate electromagnetic wave pollution. The use of absorbing materials in electronic equipment can absorb leaked electromagnetic radiation and achieve the purpose of eliminating electromagnetic interference. According to the law of electromagnetic waves propagating in the medium from low magnetic to high magnetic permeability, high magnetic permeability ferrite is used to guide electromagnetic waves, through resonance, a large amount of radiant energy of electromagnetic waves is absorbed, and then the energy of electromagnetic waves is converted into heat energy through coupling.
(2) Anti-metal aspect (payment)
In the RFID device, the electronic tag must be integrated or attached to the product, as a part of the device to function. Due to the limited space of the magnetic barrier, it is inevitable to attach the electronic tag (usually passive) to the surface of conductive objects such as metal. Or stick to a place where there are metal devices nearby. In this way, the alternating electromagnetic field induced by the tag under the action of the signal from the card reader is easily attenuated by the eddy current of the metal, which greatly weakens the signal strength, leading to the failure of the reading process. Therefore, it is necessary to add anti-metal materials and wave-absorbing materials in the product to improve the sensitivity of card reading.
(3) Magnetic isolation (wireless charger)
The wireless charger transforms a 220V power supply into a sympathetic electromagnetic field, and then after the sympathetic electromagnetic field generates a sympathetic electromagnetic field, the sympathetic electromagnetic field becomes a current for charging; when the sympathetic electromagnetic field encounters metal, the product will produce electronic eddy current, and the electronic eddy current will tend to the metal. The skin effect generates heat energy on the metal, which reduces the charging efficiency and wastes electrical energy. And it interferes with the main board of the circuit and affects the normal operation of the whole charger. The use of magnetic isolation and wave absorbing materials can provide a loop for the sympathetic magnetic field through high magnetic flux, which can improve efficiency.