Permanent magnets basic knowledge and application

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Permanent magnets and permanent magnets of the magnet.

Permanent magnet may be natural products, also known as natural magnet can also be manufactured by hand (the strongest magnets are NdFeB magnets).

Permanent magnet is heated to a certain temperature suddenly lose magnetism, which is composed of the magnet as a number of "magnetic element" of the arrangement from order to disorder caused; lost into the magnetic field of the samarium cobalt magnets   when the magnetization reaches a certain value, which in turn is magnetized, "Yuan magnet" The arrangement and from disorder to order.

In fact, a permanent magnet permanent magnet external factors will not change its magnetism is not only heat, impact will it lose their magnetism, strong magnetic field can also change its poles and its magnetic strength of the alternating current with changes in the size of the magnetic field generated quickly can give permanent magnet magnetic degaussing will not explain it

With motor magnets is just a name, the name must not be limited by experimental evidence, magnets red-hot, it loses its magnetism. What is the reason then?

To put this truth clearly, we must first know why ferromagnetic magnetic?

From the material composition is concerned, all matter is by its molecular composition. Molecule is again composed of atoms. In turn, composed of atomic nuclei and electrons, and electrons around the nucleus rotation and constantly rotating movement of electrons will produce both magnetic. However, due to their different direction of their motion, disorganized, the material inside the magnetic effects cancel each other. Thus, the material under normal circumstances, without showing magnetic properties.

However, in the external magnetic field, iron, nickel, cobalt ferromagnetic material within the original movement of electrons each, one by one like a trained soldier, she hears "attention - Xiangyoukanqi" password, you Shua look neat row, then, electronic rotary motion of the magnetic effect, consistent with the direction of the external magnetic field, the magnetic properties of these substances on the show. While copper, aluminum, lead and so on non-ferromagnetic materials in electronics, despite the strong magnetic field applied again, it seems a group of naughty disobedient child, refused to obey the "Password" and "neatly lined up" and still freely in the clutter moving, so it is not magnetic.magnetic broom

Magnet has been able to attract nails, it is because a magnetic magnet near the nails, the nails magnetized magnet magnetic field, generating mutual attraction, nails firmly with the magnet on the "stick" together.

However, when the magnet and the magnet temperature rises, the thermal motion of molecules inside them faster. Thus, more and more electronic refused to obey, "lined up" and "Password" of the. When the temperature rises to a certain value, the intense thermal motion of molecules, and finally completely destroyed the direction of electron movement regularity disappears ferrite magnets. Metallurgists complete disappearance of the magnet and the magnet magnetic temperature known as the "Curie temperature." The Curie temperature of iron is 770 ℃.

Now, you know, burned red magnet Why the truth of suction is not strong nails. Because burned red magnet, the general temperature has exceeded 800 ℃. Of course, the temperature dropped, if we are to re-magnetized magnet, it is able to re "work" together.

Permanent magnets do not need to maintain its field current to a magnet.

Basic knowledge of the permanent magnet

With wide hysteresis loop, high coercivity, high remanence, once the magnetization is able to maintain a constant magnetic material. Also known as permanent magnetic materials, hard magnetic material. Applications, the permanent magnet operates in depth and magnetizing the magnetic saturation magnetic Swiss back part the second quadrant demagnetization. Permanent magnets should have the highest possible coercivity Hc, remanence Br and maximum energy product (BH) m, in order to ensure maximum magnetic energy storage and stable magnetic properties.