1. Working principle of electromagnetic crane

Is the working principle of an electromagnetic crane based on electromagnetic induction or the strong effect of a magnetic field on an electrified conductor?

Its working principle is based on the properties of an electromagnet. What you said is incorrect. When an electromagnet is energized, it has magnetism and can attract substances such as iron. When it is de energized, it is non-magnetic, and the object it attracts can fall off.

2. A circuit that uses low voltage and low current to control high voltage and high current, with a low risk of electric shock

4. How does an electromagnetic crane work?

Electromagnetic crane is a machine that uses electromagnetic principles to move and transport steel items. The main component of an electromagnetic crane is iron blocks. By connecting the current, the electromagnet firmly attracts the steel object and lifts it to the designated location. Cut off the current, the magnetism disappears, and the steel object is put down. Electromagnetic cranes are very convenient to use, but they must have current to be used, and can be applied in waste steel recycling departments and steelmaking workshops. The device that uses electromagnets to transport steel materials is called an electromagnetic crane. Electromagnetic cranes can generate strong magnetic field forces, and can easily collect and transport iron sheets, wires, nails, scrap iron, and other various iron materials weighing tens of tons without packing, bundling, or bundling. This not only saves effort in operation, but also simplifies the work. Steel materials and machines packed in wooden boxes can be transported in the same way. When the crane is working, as long as the current in the electromagnetic coil keeps flowing, the lifted heavy object will not fall, and the invisible magnetic force is more reliable than a sturdy chain. If the power is cut off for some reason, it can cause accidents. Therefore, some electromagnetic cranes are equipped with steel claws. After the heavy objects to be transported are lifted, the sturdy steel claws automatically fall down and tightly grip them. Cranes cannot transport hot iron blocks because high-temperature steel cannot be magnetized. A large electromagnetic crane can lift nearly a hundred tons of heavy objects at once, which is very practical.

The working principle of an electromagnetic crane is to generate a magnetic field through electricity, which in turn generates electromagnetic force, and use the generated electromagnetic force to attract objects.
The characteristics of electromagnetic cranes: 1. The more turns of the coil, the greater the magnetic force. 2. The magnetic poles can be changed. 3. The higher the current, the greater the magnetic force. Electromagnets have many advantages: the presence or absence of electromagnetic magnetism can be controlled by on/off current; The magnitude of magnetism can be controlled by the strength of the current or the number of turns in the coil; It is also possible to change the resistance to control the magnitude of the current to control the magnitude of the magnetism; Its magnetic poles can be controlled by changing the direction of the current, and so on. That is, the strength of magnetism can be changed, the presence or absence of magnetism can be controlled, the direction of magnetic poles can be changed, and magnetism can disappear due to the disappearance of current. Electricity can generate magnetism, and magnetism can also generate electricity. Electrical energy is generally generated in coils
When converted into magnetic energy, electrical energy is converted into magnetic energy, and the magnetic moment is generated in the same polarity. This is the driving force for work, which is the conversion of electrical energy into kinetic energy.
For example, if you put the same poles of two fast magnets together, this process will definitely be subject to magnetic resistance. When you overcome this resistance and bring these two poles into contact, you do work on them, and they store your energy as magnetic energy; When you release one end with your hand, the magnet at that end will be ejected, and this process converts magnetic energy into kinetic energy. rules
The rule that represents the relationship between the direction of magnetic field lines excited by current and current, also known as the right-hand spiral rule.
As early as 1820, Oster from Denmark discovered this principle. In 1822, French physicists Arago and Lussac discovered that when an electric current passes through a winding with iron blocks, it can magnetize the iron blocks in the winding. This is actually the initial discovery of the electromagnetic principle. In 1823, Sturgeon also conducted a similar experiment: he wound 18 turns of bare copper wire around a U-shaped iron rod that was not a magnet. When the copper wire was connected to a voltaic battery, the copper coil wound around the U-shaped iron rod generated a dense magnetic field, turning the U-shaped iron rod into an "electromagnet". The magnetic energy on this electromagnet is much greater than that of permanent magnets, and it can suck up iron blocks that are 20 times heavier than it. However, when the power is cut off, the U-shaped iron rod cannot suck up any iron blocks and becomes a regular iron rod again. Sturgeon's invention of the electromagnet showed a bright future for converting electrical energy into magnetic energy, and this invention quickly spread to coastal countries in Britain, the United States, and Western Europe.
Crane: a powerful electromagnetic coil used in industry, powered by high current, can be used to lift steel plates, containers, scrap iron, etc. (2) Phone: Next section introduction. (3) Ampere meter, voltmeter, galvanometer (4), electric bell, etc. (5) Automation control equipment (6) includes industrial automation control and office automation. 7) Packaging machinery, medical equipment, food machinery, textile machinery, etc. (8) Electromagnetic Relay (9) Maglev Train
(1) 1. Divided by current: 1. AC electromagnet 2. DC electromagnet 2. Divided by purpose: 1. Traction electromagnet 2. Frame type electromagnet 3. Self holding electromagnet 4. Suction cup electromagnet 5. Tubular electromagnet. Electromagnets are devices that can generate magnetic force by passing current, and are non permanent magnets that can easily activate or eliminate their magnetism. For example, large cranes use electromagnets to lift abandoned vehicles When current passes through a wire, a magnetic field is generated around the wire. By applying this property, when current is passed through a solenoid, a uniform magnetic field will be created inside the solenoid. If a ferromagnetic material is placed at the center of the solenoid, it will be magnetized and greatly enhance the magnetic field.