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磁铁的力量：它们如何影响我们的生活

磁铁的力量虽然看起来很小，但在我们的生活中起着至关重要的作用。它以一种无声而坚定的方式影响着我们的日常生活和工作。

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The direction of geomagnetism The direction of geomagnetism is not fixed. About 780000 years ago, the Earth's magnetic field underwent a reversal, and then pushed forward, similar events occurred. However, the specific reason for the geomagnetic reversal is unknown so far. It is only known that this cycle will occur between 100000 and 50 million years. People still know very little about the structure of the Earth's interior, which can be said to be easy for heaven to enter but difficult for earth, To gain a deeper understanding of the Earth underground, drilling wells and tunnels is possible. However, currently the deepest drilling is only about 10 kilometers, and it is still far from reaching a depth of 2900 kilometers in the Earth's core.The former Soviet Union once dug holes into the center of the earth, and stopped at a depth of 13000 meters. The reason is unknown. It is generally believed that the deeper the depth, the harder it is. In addition, the deeper the depth, the higher the temperature. Th: 19

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Why do magnets have suction Magnet is a common thing. The compass, one of China's the Four Great Inventions, is made of magnets. Everyone knows that magnets are attractive to iron. Why? Where does its energy come from? Starting from the microscopic world, as we all know, any substance in the world is composed of molecules, which in turn are composed of atoms. Atoms are composed of nuclei and electrons outside the nucleus, with nuclei positively charged and electrons outside the nucleus negatively charged. Electrons outside the nucleus move around the nucleus, creating a magnetic moment. Therefore, a single atom is magnetic. Therefore, everything is magnetic, but the atomic arrangement of general matter is disorderly, Magnetism cancels out each other, so its external appearance lacks magnetism.From the above description, we can know that individual atoms also have magnetism. When the magnetic moments are arranged in an orderly manner, all the magnetic fields inside the atoms overlap with each other, and the ob: 19

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The magnetism of the Earth The Earth itself can generate a huge magnetic field, shielding life on Earth from cosmic rays and allowing the compass to function. On the other hand, the core of the Earth is mainly composed of iron, with temperatures as high as 5500 degrees Celsius, much higher than the Curie temperature of iron. So, why wouldn't the Earth lose its magnetism?The reason is that the geomagnetic field is not formed by a large magnet. The Earth's core is divided into a molten outer core and a solid inner core, because the pressure of the inner core is much higher than that of the outer core, so although the temperature of the inner core is higher, it does not melt.Due to the unique structure of the Earth's core, when the Earth rotates, there is a differential rotation between the inner and outer cores. In the outer core, convective iron forms a magnetic field through electromagnetic induction. Therefore, the geomagnetic field can remain in existence under high temperature conditions.: 19

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What is sintered neodymium iron boron magnet? Sintered neodymium iron boron magnets are the most commonly used type of permanent magnet material. It is made of alloys of neodymium, iron, and boron, forming a Nd2Fe14B tetragonal crystal structure. Meanwhile, according to its raw material composition, it is a rare earth magnet.Customized sintered neodymium iron boron magnets are a complex process that includes the preparation, melting, grinding, pressing, sintering, machining, electroplating, magnetization, inspection, and packaging of formula powders.Preparing the formula magnetic powder is the most important process. Because technicians can add additional rare earth elements to adjust magnetic properties, such as cobalt (Co) for high temperatures and dysprosium (Dy) for better intrinsic coercivity.: 18

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Why is sintered neodymium iron boron permanent magnet so sturdy? Melted alloy ingots are made into powder using powder metallurgy technology, which is directionally formed in a magnetic field. So after sintering and densification of the formed rough embryo in inert gas or vacuum, the sintered neodymium iron boron has a relatively high magnetic energy product and coercivity, high cost-effectiveness, and good mechanical properties.How are sintered neodymium iron boron magnets classified?Do you know that sintered neodymium iron boron magnets are evaluated based on the maximum magnetic energy product. Take a look at our neodymium magnet specifications page and you will find a rule that the maximum value of grade N35 (BH) is 33-36MGOe in the middle. Therefore, higher values indicate stronger magnets, ranging from N35 to N55.The letter after the number represents the maximum operating temperature (usually in Celsius), ranging from M (100 ℃), H (120 ℃), SH (150 ℃), UH (180 ℃), EH200 ℃) to AH (220 ℃). If there is no letter like N42 after it, the maximum ope: 18

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The disappearance of magnetic force Additionally, the ferromagnetism of an object is temperature dependent. As the temperature increases, the kinetic energy of molecules increases, and thermal motion becomes more intense. When the temperature reaches a critical point, the arrangement of atomic magnetic moments is no longer ordered, the net magnetic moment becomes zero, and ferromagnetism disappears. The temperature at this point is the Curie temperature. If the temperature drops below the Curie temperature, ferromagnetism will recover.The Curie temperature of iron is 770 degrees Celsius, nickel is 354 degrees Celsius, dysprosium is -185 degrees Celsius, ferric oxide is 585 degrees Celsius, and neodymium magnet is 330 degrees Celsius. Therefore, if iron is burned red, it cannot be attracted by magnets. When the temperature drops below 770 degrees Celsius, the iron that has regained its magnetism can be attracted by the magnet.: 15

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The source of magnetic force Essentially, magnetic force is electromagnetic force, which is one of the four fundamental natural forces. The generation of magnetic force needs to be explained at the atomic scale.For an atom, its center is a nucleus composed of protons and neutrons (hydrogen nuclei only have protons), and the periphery is an electron moving around the nucleus. But unlike planets that orbit stars in precise orbits, the positions where electrons appear are random, and only the probability of electrons appearing at a certain position can be known.According to quantum mechanics, the spin of electrons and their motion in orbit both generate a dipole magnetic moment, which forms a magnetic field. Similarly, spinning atomic nuclei also form a magnetic field, but this is much weaker than the magnetic field generated by electron magnetic moments. The various magnetic moments in an atom will be superimposed and cancelled, resulting in a total magnetic moment - the atomic magnetic moment.Under the action of a: 15

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Magnets can not only attract iron Among many minerals, the presence of magnets is particularly noteworthy. Natural magnets can have a mutually attractive relationship with iron. Can a magnet attract other metals besides iron?Strictly speaking, it is possible. Magnets are attractive to ferromagnetic metals, such as cobalt and nickel. The working principle of magnets is quite peculiar and often fascinates quantum mechanics experts.Physicists believe that ferromagnetic materials like iron have many unmatched electrons inside. When an external magnetic field is applied to them, they will be "magnetized", and the manifestation of magnetization is that they can be attracted by a magnet.Magnets are the most common thing in our lives, but if we want to explain magnetism, general theories are not enough. Even if you call Newton, he may not be able to explain the cause of magnetic force in magnets. Only quantum mechanics can do it.We know that there are four fundamental forces in the universe, and electromagnetic force is one of: 14

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The application of neodymium iron boron magnets in loudspeakers But many people don't know that if a magnet loses its magnetism after being used for a long time, what should we do at this time? Below, the editor will introduce to you how to remove magnetism from a magnet!Tool materials.Magnets have strong adsorption power and can hold onto small objects. But over time, a strong magnetic field will be generated. What if we want to eliminate the magnetic field of a magnet?Method steps.Firstly, we need to prepare a dry cloth or tissue to wipe away the dust and other dirt on our palms or soles;2. Then we put our hands on a non charged metal and rub it a few times;3. Next, we will place this charged hand on another uncharged metal and rub it a few times;4. Finally, we can put the charged hand back in its original position;Precautions.1. When erasing, be careful not to touch the skin to avoid the risk of electric shock!2. Before erasing, be sure to keep your hands clean and tidy! Otherwise, it is easy to generate static electricity!!3. When erasing,: 14

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Application of high-performance neodymium iron boron permanent magnet materials in the field of robotics High performance neodymium iron boron magnets are mainly used in fields such as new energy vehicles, high-end motors, wind power generation, robots, and intelligent manufacturing. Today, we mainly talk about the application of high-performance neodymium iron boron permanent magnet materials in the field of robotics.The application of high-performance neodymium iron boron permanent magnet materials in the field of robotics mainly includes high-precision permanent magnet servo motors and stepper motors (propeller motors for drones), which require high control accuracy, small size, light weight, and some special robots also require high power density and large torque. The working temperature of permanent magnet servo motors and stepper motors used in robots is generally below 100 ℃, and H or SH grade neodymium iron boron magnets are commonly used.Application of neodymium iron boron in the field of roboticsDue to the wide variety of robots, there is a significant difference in the quantity: 12

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