Magnets are used in many places in life. Here are simple examples: packaging boxes, glasses cases, mechanical equipment, permanent magnetic chucks, magnetic twist buckles, magnetic rods, magnetic beads, cutting plotters, Plotters, loudspeakers, magnetic therapy and health care, bags and leather goods, instruments and instruments, induction lamps, magnetic accessories, toys, car ceiling lights, car antennas, car rotors, stationery, teaching instruments, sanitary ware, mahjong machines, furniture and door absorbers, magnetic EVA Teaching aids, magnetic refrigerator magnets, magnetic puzzles, magnetic darts, magnetic photo frames, glass magnets, magnetic phone books, compressors, car motors, magnetic mixers, fuel tank magnet sealing valves, magnetic sweepers, flywheel generators, stepper motors, electronic products , permanent magnet synchronous motor, fishing gear supplies, magnetic brush, bait tray, magnetic switch, floating box, magnetic mattress, precision machinery, magnetizer, commutator, solar coating machine, HID hernia lamp telescopic lamp, Shenzhen Ai Ermagnetic, specializing in the production of NdFeB strong magnets, anti-EMI magnetic filters, magnetic temperature switches, magnetic massage fitness hula hoops, magnetic solid pull bodies, magnetic cockroach traps, refrigeration permanent magnet filters, magnetic levitation health care beds, keys Self-adhesive magnetic lock, magnetic health care tank, environmentally friendly and energy-saving magnetized nozzle, permanent magnet stop valve, ozone magnetic therapy bathtub, green magnetic water cup, magnetic multi-functional clothes hook, permanent magnetized anti-scaling device, signal magnet rings, brake magnet rings, magnetic oil filters, etc.
Introduction:
A magnet is a substance that can attract or repel each other. If the small molecules inside an object can be arranged in the same direction, it will become a magnet. . The ingredients are iron, cobalt, nickel and other atomic structures with special structures. The atoms themselves have magnetic moments. Generally, the molecules of these minerals are arranged in a disordered manner. When the magnetic regions interact with each other, they do not show magnetism, but when the molecules are aligned in the same direction under the guidance of an external force (such as a magnetic field), they show magnetism, which is commonly known as a magnet. Iron, cobalt, and nickel are the most commonly used magnetic materials. Basically, magnets are divided into permanent magnets and soft iron. Permanent magnets are added with strong magnetism to align the spin of the magnetic material and the angular momentum of the electrons in a fixed direction. Soft magnets are Adding current (also a method of adding magnetism) and removing the current from the soft iron will slowly lose its magnetism. Magnets were not invented by humans. There are natural magnetites. The first people to discover and use magnets should be the Chinese. Therefore, the "compass" is one of the four great inventions of the Chinese.
Applications of electromagnets in daily life:
(1) Electromagnetic crane:
Electromagnets have many practical applications, and the most direct application is Electromagnetic crane. Install the electromagnet on the crane, energize it to suck up a large amount of steel, move it to another position, cut off the current, and put the steel down. Large electromagnetic cranes can lift several tons of steel at a time.
(2) Electromagnetic relay:
An electromagnetic relay is an automatic switch controlled by an electromagnet. Using electromagnetic relays, low voltage and weak current can be used to control high voltage and strong current to achieve long-distance operation.
(3) Electric bell:
The circuit is closed, the electromagnet attracts the elastic piece, causing the hammer to move in the direction of the bell, the hammer strikes the bell and makes a sound, and the circuit is disconnected at the same time , the electromagnet loses its magnetism, the hammer bounces back again, and the circuit is closed. Repeated like this, the electric bell made a continuous ringing sound.
(4) Electromagnetic concentrator:
The electromagnetic concentrator is made based on the principle that magnets are attractive to iron ore. When the electromagnetic concentrator is working, the iron sand will fall into box B. When the ore passes through the electromagnet during the falling process, the non-iron ore cannot be attracted by the electromagnet and falls directly into box A due to the effect of gravity; while the iron ore can be attracted by the electromagnet, adsorbed on the drum and rotate with the drum. , when the electromagnet reaches the top of box B, the attraction of the electromagnet to the ore is already very small, so the ore falls into box B due to gravity.
(5) Maglev train:
The maglev train is a maglev high-speed train system that uses contactless electromagnetic levitation, guidance and drive systems. It can reach a speed of more than 500 kilometers per hour and is the fastest ground passenger transportation vehicle in the world today. It has the advantages of fast speed, strong climbing ability, low energy consumption, low noise during operation, safety and comfort, no fuel consumption, and less pollution.
And it adopts an elevated method, occupying very little cultivated land. Maglev trains mean that these trains use the basic principles of magnetism to levitate on guide rails instead of the old steel wheel and rail trains. Magnetic levitation technology uses electromagnetic force to lift the entire train carriage, getting rid of annoying friction and unpleasant clanging sounds, enabling fast "flight" without contact with the ground and without fuel.
(6) Speaker:
A speaker is a device that converts electrical signals into acoustic signals. It is mainly composed of fixed permanent magnets, coils and conical paper cones. When sound passes through the coil in the speaker in the form of audio current, the magnetic field generated by the magnet on the speaker will exert a force on the coil. The coil will vibrate at different frequencies due to changes in the strength of the current, which will then drive the paper cone to emit different sounds. Frequency and intensity of sound. The paper cone spreads vibrations through the air, thus producing the sound we hear.
(7) Household appliances:
For example, refrigerators and vacuum cleaners have electromagnets. Electromagnets are also used in motors, generators and electromagnetic relays. The water inlet and drain valves of fully automatic washing machines and the induction flush valves in bathrooms are also controlled by electromagnets.