Magnets are used in many places in life, simple examples, such as: packaging boxes, eyeglasses boxes, mechanical equipment, permanent magnetic suction cups, magnetic twisted magnetic buttons, magnetic rods, magnetic beads, lettering machines, plotters, speakers and horns, magnetic health care, bags and leather goods, instrumentation, induction lamps, magnetic ornaments, toys, automobile roof lamps, car antennae, automobile rotor, stationery, teaching instruments, sanitary ware, mahjong machine , furniture and door sucker, magnetic EVA teaching aids, magnetic refrigerator stickers, magnetic puzzles, magnetic darts, magnetic photo frames, glass magnets, magnetic phone books, compressors, automobile motors, magnetic mixers, tank magnet sealing valves, magnetic sweepers, flywheel generators, stepping motors, electronic products, permanent magnet synchronous motors, fishing supplies, magnetic brushes, bait pulling disks, magnetron switches, drift boxes, magnetic mattresses, precision machinery, Magnetizer, commutator, solar coating machine, HID hernia lamp telescopic lamp, Shenzhen Ai Er magnetoelectricity, specializing in the production of neodymium-iron-boron magnets, anti-EMI magnetic filters, magnetic temperature switches, magnetic massage fitness hula hoops, magnetic solid body, magnetic cockroach traps, refrigeration permanent magnetic filters, magnetic levitation health care beds, the key to self-adhesive magnetism control locks, magnetic therapy health care canisters, environmentally friendly energy-saving magnetized nozzles, permanent magnetic shut-off valve, ozone magnetic therapy bathtub, green magnetic wave water cup, magnetic suction multifunctional hanging hook, permanent magnet magnetization anti-scaling device, signal magnetic ring, brake magnetic ring, magnetic oil filter and so on.
Introduction:
Magnet is a substance that can attract or repel each other, if it is said that the tiny molecules inside an object can all be aligned in the same direction, it will become a magnet. Components are iron, cobalt, nickel and other special atomic structure, the atoms themselves have a magnetic moment, the general molecular arrangement of these minerals is chaotic. Magnetic areas affect each other will not show magnetic, but in the external force (such as magnetic field) guide molecular arrangement tends to the same direction, it will show magnetic, which is commonly known as a magnet. Iron, cobalt, nickel, is 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 spin of the magnetic material and the electron angular momentum into a fixed direction of the arrangement of soft magnetic is coupled with the electric current (is also a method of adding magnetic force) and so the current to remove the soft iron will lose its magnetism slowly. Magnet is not invented by man, there is natural magnetite, the first to discover and use magnet should be the Chinese. So the compass is one of the four great inventions of the Chinese.
Electromagnets in daily life applications:
(1) Electromagnetic cranes:
Electromagnets are used in many practical applications, the most direct application is the electromagnetic crane. The electromagnet installed in the crane, energized to suck up a large amount of steel, move to another position after cutting off the current, put down the steel. Large electromagnetic cranes can lift several tons of steel at a time.
(2) electromagnetic relay:
Electromagnetic relay is an automatic switch controlled by electromagnet. The use of electromagnetic relay can be used low voltage and weak current to control high voltage and strong current, to realize long-distance operation.
(3) electric bell:
The circuit is closed, the electromagnet attracts the elastic piece, so that the hammer moves in the direction of the bell, and the hammer strikes the bell and makes a sound, and at the same time the circuit is disconnected, the electromagnet has no more magnetism, and the hammer is bounced back, and the circuit is closed. This is repeated over and over again, and the bell makes a continuous ringing sound.
(4) Electromagnetic concentrator:
Electromagnetic concentrator is made according to the principle of magnet's attraction to iron ore. When the electromagnetic concentrator works,the iron ore will fall into the B box. Ore in the falling process, after the electromagnet, non-iron ore can not be attracted by the electromagnet, due to the role of gravity directly into the A box; and iron ore can be attracted by the electromagnet, adsorption on the drum and with the drum together with the rotation to the top of the B box when the electromagnet on the attraction of the ore has been very small, so the ore falls into the B box due to the role of gravity.
(5) magnetic levitation train:
Magnetic levitation train is a kind of magnetic levitation high-speed train system which adopts contactless electromagnetic levitation, guidance and driving system. Its speed can reach more than 500 kilometers per hour, is the world's fastest ground passenger transportation, has the advantages of fast speed, strong climbing ability, low energy consumption, low noise when running, safe and comfortable, no fuel, less pollution. And it adopts the use of elevated methods, taking up very little arable land. Maglev trains mean that these trains utilize the basic principles of magnetism to levitate on rails instead of the old steel wheel and rail trains. Maglev technology utilizes electromagnetic forces to lift the entire train car, eliminating nasty friction and unpleasant clanking noises and allowing for fast "flight" without contact with the ground and without fuel.
(6) loudspeaker:
The loudspeaker is a device that converts electrical signals into acoustic signals. Mainly by the fixed permanent magnets, coils and conical paper cone composition. When the sound in the form of audio current through the coil in the speaker, the magnetic field produced by the magnet on the speaker will produce force on the coil, the coil will be due to changes in the strength of the current to produce a different frequency of vibration, which in turn drives the paper cone to send out a different frequency and strength of the sound. The paper cone spreads the vibrations through the air, and this produces the sound we hear.
(7) Household appliances:
Electromagnets are found on refrigerators and vacuum cleaners, for example. Electromagnets are also used in electric motors, generators and electromagnetic relays. Automatic washing machine water inlet, drain valve, bathroom inductor flusher valve, are also controlled by electromagnets.