A magnet is a type of magnet.
Magnets are capable of attracting metals such as iron, nickel, cobalt, etc. and are commonly known as iron absorbers. They can be categorized into permanent magnets, which are generally common, and electromagnets, which are magnetic only when energized.
Magnets, if made in the form of rods or needles and hung up, will naturally point to the south and north poles of the earth. Magnets are categorized into large magnets and small magnets.
Large magnets Magnets have a wide range of uses. Using electromagnets, they are made into cranes for transporting steel. When energized, it becomes a magnet with strong magnetic properties, so it can suck up bulky steel.
When you put down the steel, just cut off the power. Small magnets Compared to large magnets, the compass is small, light, and much less magnetic.
The purpose of a compass is not to attract iron, but to reflect the magnetic force of the Earth.
What are the uses of magnets
Functions
Physical roles
1. Pointing north and south
2. Attracting light objects
3. Electromagnets can be used as electromagnetic relays
4. Electric motors
5. Generators
6. Electroacoustic sound
7. Magnetic therapy
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8. Magnetic levitation
9. Nuclear magnetic **** vibration
Food therapy
Magnet flavor salty, flat; to the liver, kidney meridian; the texture of the town of descending
With the liver submerged yang, bright ears and eyesight, sedative and tranquilizing the mind, the effect of the gas to calm the wheezing
The main treatment of the liver yang dizziness, palpitations, insomnia, fainting and cataracts, tinnitus, deafness, renal deficiency, gasping and retrogression.
Applications in traditional industries
When talking about the magnetic origin of magnetic materials, electromagnetic induction, and magnetic devices, we have already mentioned the practical applications of some magnetic materials. In fact, magnetic materials have been widely used in various aspects of conventional industry.
For example, without magnetic materials, electrification would have been impossible because generators are used for power generation, transformers for power transmission, electric motors for electrical machinery, and loudspeakers for telephones, radios, and televisions. Numerous instruments and meters are used in the magnet coil structure. These have already been mentioned in the rest of the story.
The nature of magnets and how much they do
A mineral, magnetite; magnets are not invented, there is natural magnetite, the first to discover and use magnets should be the Chinese.
So the compass is one of the four great inventions of the Chinese. As for the composition that is iron, cobalt, nickel and so on. Its atomic structure is special, the atom itself has a magnetic moment. The general arrangement of these mineral molecules is chaotic. Magnetic areas interact with each other to show no magnetism... But in the external force (such as magnetic field) under the guidance of the molecular arrangement of the direction of convergence. They become magnetic. Commonly known as magnets. Iron, cobalt and nickel are the most commonly used magnetic substances Basically, magnets are divided into permanent magnets and soft iron permanent magnets are coupled with strong magnetism so that the magnetic material spin and electron angular momentum into a fixed direction of the arrangement of the soft magnet is coupled with the electric current (is also a method of adding magnetic force), and so the current to remove the soft iron will slowly lose their magnetic properties as for the earliest magnets who found the oldest record is the Yellow Emperor of China fought the Chiyu guide car, so it is known as one of the four major Chinese inventions The four great inventions of China! China in the first century BC that is known to have magnet polarization.
During the Warring States period, there was the use of a natural magnet, placed on a graduated copper disk, used for divination. In the Northern Song Dynasty, two methods were used to create artificial magnets: one was to place red-hot iron needles in the north-south direction, and then use the Earth's magnetic field to magnetize the needles after rapid cooling; and the other was to use magnets to rub the needles.
The existence of magnetic declination was documented in Mengxi Bianan, which found that under the influence of magnetic declination, the magnetic needle points south, slightly east of the true south. This knowledge led to the development of the scientific use of magnets as compasses.
Magnet is a generic term for something that is magnetic, and its actual composition does not necessarily include iron. Pure metal state of iron itself is not permanently magnetic, only close to the permanent magnet will be induced to produce magnetism, Nantian magnet production, the general permanent magnet inside the addition of other impurities (such as carbon) to stabilize the magnetism, but this will make the electrons free to reduce the conductivity and not easy to conduct electricity, so the current through the bulb does not light up.
Iron is a common magnetic element, but many other elements have stronger magnetic properties, such as many powerful magnets are a mixture of rubidium iron boron. Basic knowledge: The ancient Greeks and Chinese discovered a naturally magnetized stone in nature and called it "iron absorption stone". This stone can magically pick up small pieces of iron, and always point in the same direction after swinging at random.
Early mariners used this magnet as their earliest compass to find their way at sea. Over the millennia, magnets have become a powerful material in our lives today.
By synthesizing alloys of different materials it is possible to achieve the same effect as a magnet, but also to increase the magnetic force. Man-made magnets appeared in the 18th century, but the process of creating stronger magnetic materials was slow until the 1920s when aluminum nickel cobalt (Alnico) was created.
Subsequently, in the 1950s, ferrite was produced, and in the 1970s, rare earth magnets [Rare Earth magnets include neodymium-iron-boron (NdFeB) and samarium cobalt (SmCo)] were produced. Since then, the technology of magnetism has developed rapidly, and strong magnetic materials have made components more compact.
What is the direction of magnetization (orientation)? Most magnetic materials can be magnetized to saturation in the same direction, which is called the "direction of magnetization" (orientation). Magnets without orientation (also called isotropic magnets) are much less magnetic than oriented magnets (also called anisotropic magnets).
What is the standard industrial definition of "North and South Poles"? The definition of "North Pole" is that the North Pole of a magnet points to the North Pole of the Earth when the magnet is rotated randomly. Similarly, the south pole of a magnet points to the south pole of the earth.
How can you tell the north pole of a magnet without labeling it? Obviously you can't tell by eye alone. You can use a compass close to the magnet, and the needle pointing to the Earth's North Pole will point to the magnet's South Pole.
How do I handle and store a magnet safely? Always be very careful as magnets can attract themselves together and can pinch your fingers. It is also possible to damage the magnets themselves by bumping them against each other (knocking off corners or cracking them).
Keep magnets away from items that are easily magnetized, such as floppy disks, credit cards, computer monitors, watches, cell phones, and medical devices. Keep magnets away from pacemakers.
Larger magnets should have plastic or cardboard spacers between each piece to ensure that the magnets can be easily separated. Magnets should be stored in a dry, temperature-controlled environment as much as possible.
How do I isolate my magnets? Only materials that can be adsorbed onto the magnet can serve to isolate the magnetic field, and the thicker the material, the better the effect of isolation. What is the strongest magnet? Currently the highest performance magnets are rare earth magnets, and in rare earth magnets NdFeB is the most powerful magnet.
But Samarium Cobalt is the most powerful magnet in environments above 200 degrees Celsius. Types of magnets: magnets, should be called magnets, English Mag, magnets are now divided into two main categories, one is soft magnetic, one is hard magnetic; soft magnetic including silicon steel sheet and soft magnetic core; hard magnetic including alnico, samarium cobalt, ferrite and neodymium-iron-boron, which, the most expensive samarium cobalt magnets, the most inexpensive ferrite magnets, the highest performance of neodymium-iron-boron magnets, but the most stable performance and the temperature coefficient of the best is the aluminum nickel cobalt magnets, users can choose according to the temperature of 200 degrees Celsius above environment. Cobalt magnets, users can choose different hard magnetic products according to different needs.
How to define the performance of a magnet? There are three main performance parameters to determine the performance of the magnet: residual magnetism Br: permanent magnets magnetized to technical saturation, and remove the external magnetic field, the Br retained is known as the residual magnetic induction strength. Coercivity Hc: magnetization to technical saturation of permanent magnets B reduced to zero, the need to add the reverse magnetic field strength is called magnetic coercivity, simply called coercivity Magnetic Energy Product BH: represents the magnet in the air gap space (magnet two pole space) established magnetic energy density, that is, the static magnetic energy per unit volume of the air gap.
Since this energy is equal to the product of the magnet's Bm and Hm, it is called the magnetic energy product. Magnetic field: the space of magnetic action on the magnetic poles for the magnetic field surface magnetic field: the magnetic induction intensity at a specified location on the surface of a permanent magnet how to choose a magnet? Before deciding which magnet to choose, it should be clear what kind of function the magnet is needed to perform? The main role: moving objects, fixed objects or lifting objects.
Shape of magnet needed: circular, toroidal, square, tile or special shape. Dimensions of the required magnet: length, width, height, diameter and tolerances, etc.
The size of the required magnet: length, width, height, diameter and tolerances.
The suction power of the magnet required, the desired price and quantity, etc.
The magnet is a magnet that can be used in a variety of applications.
What is the magnet used for?
Packaging boxes, eyeglass cases, mechanical equipment, permanent magnetic suction cups, magnetic torque magnetic buttons, magnetic rods, magnetic beads, lettering machines, plotters, speakers and horns, magnetic therapy health care, bags and leather goods, instrumentation, induction lamps, magnetic ornaments, toys, automobile headlights, car antennae, automobile rotors, stationery, teaching instruments, sanitary ware, mahjong machines, furniture and door suction, magnetic EVA teaching aids, magnetic refrigerator stickers, magnetic puzzles, magnetic darts, magnetic photo frames, glass magnets, magnetic phone books, compressors, car motors, magnetic mixers, tank magnet sealing valves, magnetic sweepers, flywheel generators, stepper motors, electronic products, permanent magnet synchronous motors, fishing supplies, magnetic brushes, bait pulling trays, magnetron switches, drift boxes, magnetic mattresses, precision machinery, magnetizers, commutators, solar coater, HID hernia lamps telescopic Lamp, anti-EMI magnetic filter, magnetic temperature switch, magnetic *** fitness hula hoop, magnetic solid pull body, magnetic cockroach catcher, refrigeration permanent magnetic filter, magnetic levitation health care bed, key self-adhesive magnetic control lock, magnetic therapy health care cans, environmental protection and energy saving magnetized nozzles, permanent magnetic shut-off valve, ozone magnetotherapy bathtubs, green magnetic waves of water cups, magnetically suction multifunctional hooks, permanent magnet magnetism magnetization scale preventer, signal magnetic ring, magnetic brake ring, magnetic oil filter and so on.
What are the uses of magnets? What kinds of shapes do they come in?
Physical effects
1 Points north and south
2 Attracts light objects
3 Electromagnets can be used as electromagnetic relays
4. Electric motors
5 Generators
6 Electroacoustics
7 Magnetotherapy
8 Magnetic Levitation
9 Nuclear Magnetic **** Vibration
Therapeutic effects
Magnetite taste salty, nature flat; to the liver, kidney meridian; heavy texture Zhenbian;
has the effect of calming the liver and submerging the yang, smart ears and bright eyes, sedative and tranquilize the spirit, nativity and asthma;
the main treatment for the liver and yang dizziness, palpitations and insomnia, fainting and cataracts in the eyes, tinnitus and deafness, and kidney deficiency and wheezing.
The shape is generally hoof magnets and bar magnets and on the horn on the round it