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Learn the basics of these magnets

11选5一注是多少钱Magnet basics

Overview of magnetic materials: Magnetic is one of the basic properties of matter. The magnetic phenomenon is associated with various forms of charge motion, and magnetic properties are generated due to the electron motion and spin inside the material, which generate a magnetic field of a certain magnitude. Everything is magnetic. The nature of the magnetic can be divided into paramagnetic substances, diamagnetic substances, ferromagnetic substances, antiferromagnetic substances, and ferrimagnetic substances, of which ferromagnetic substances and ferrimagnetic substances are ferromagnetic substances, usually these two The substances are collectively referred to as magnetic materials.


Classification, performance characteristics and uses of magnetic materials:

1 Ferrite magnetic material: generally refers to the oxide of oxide and other metal oxides. Most of them have ferrimagnetic properties. Features: The resistivity is much higher than that of metal, about 1-10 (12th power) ohms/cm, so the vortex loss and skin effect are small, suitable for high frequency use. The saturation magnetization is low and it is not suitable for high magnetic density applications. The Curie temperature is relatively low.


11选5一注是多少钱2 Ferromagnetic material: refers to a material with ferromagnetism. For example, iron-nickel-cobalt and its alloys, alloys of certain rare earth elements. Below the Curie temperature, the material has a large magnetization when external magnetic is applied.


3 Ferrous magnetic material: refers to materials with ferrimagnetic properties, such as various ferrites. Below the Neel temperature, the material has a large magnetization when external magnetic is applied.


4 Permanent magnet material: The magnet is magnetized to remove the external magnetic field and still has strong magnetic properties, characterized by high coercive force and large magnetic energy product. It can be divided into aluminum nickel cobalt, rare earth cobalt, neodymium iron boron and the like. Ferrite permanent magnets, for example, barium ferrite, barium ferrite, other permanent magnets, such as plastic magnetic.


5 soft magnetic material: material that is easy to magnetize and demagnetize. Mn-Zn ferrite soft magnetic material, its working frequency is between 1K-10M. Nickel-zinc ferrite soft magnetic material, the working frequency is generally 1-300MHZ.


6 Metal soft magnetic material: Compared with ferrite, it has high saturation magnetic induction and low coercivity, such as engineering pure iron, iron-aluminum alloy, iron-cobalt alloy, iron-nickel alloy, etc., which are commonly used in transformers.


11选5一注是多少钱The terminology of magnets:


1 Saturation magnetic induction: (saturation magnetic flux density) The magnetic induction when the magnetic body is magnetized to saturation. In practical applications, the saturation magnetic induction often refers to the magnetic induction under a given magnetic field (substantially reaching the magnetic field of magnetic saturation).


2 Residual magnetic induction: From the saturation state of the magnetic body, the magnetic field (including the self-retracting magnetic field) is monotonously reduced to a magnetic induction of zero.

3 Magnetic flux density coercive force, which is the magnetic induction intensity when the magnetic induction intensity B is reduced to zero by monotonously changing the magnetic field strength from the saturation magnetization state of the magnetic body.

4 Intrinsic coercive force: The magnetic field strength which reduces the magnetization M to 0 from the saturation magnetization state of the magnetic body.

5 Magnetic energy product: The product of the magnetic induction and the magnetic field strength at any point on the demagnetization curve of the permanent magnet.

6 Initial permeability: The limit of the magnetic permeability of a magnetic body in a magnetic neutral state.

7 Loss tangent: It is the ratio of the imaginary part to the real part of the series complex permeability. The physical meaning is the ratio of the loss energy to the stored energy in each cycle of the alternating magnetic field.

8 Specific loss tangent: This is the ratio of the loss tangent of the material to the initial permeability.

9 Temperature coefficient: The amount of change measured between two given temperatures divided by the amount of temperature change.

10 Specific temperature coefficient of magnetic permeability: the ratio of the temperature coefficient of magnetic permeability to the magnetic permeability.

11 Curie temperature: At this temperature, the spontaneous magnetization is zero, that is, the critical temperature at which the ferromagnetic material (or submagnetic material) changes from a ferromagnetic state (or a ferrimagnetic state) to a paramagnetic state.


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