A device with a core inside and a magnetic coil like a magnet is called an electromagnet. The iron core is easy to magnetize. Such an electromagnet is magnetic when energized, and disappears after being powered off. Electromagnets are extremely widely used in everyday life. The invention of the electromagnet also greatly improved the power of the generator.
Lifting electromagnets have many advantages: the presence or absence of the magnetism of the lifting electromagnet can be controlled by on/off current; the magnitude of the magnet can be controlled by the strength of the current or the number of turns of the coil; it can also be controlled by changing the magnitude of the resistance control current. Magnetic size; its magnetic pole can be controlled by changing the direction of the current, and so on. That is, the strength of the magnetic can be changed, the presence or absence of the magnetic can be controlled, and the direction of the magnetic pole can be changed.
History of electromagnets In 1822, the French physicists Arago and Lussac discovered that when current was passed through a winding of iron, it could magnetize the iron in the winding. This is actually the initial discovery of the electromagnet principle. In 1823, Sturgeon did a similar experiment: he wrapped 18 turns of bare copper wire on a U-shaped iron bar that was not a magnet bar. When the copper wire was connected to the voltaic cell, it was wound around U. The copper coil on the iron rod creates a dense magnetic field, which turns the U-shaped iron rod into an "electromagnet". The magnetic energy on this electromagnet is much larger than that of the permanent magnet. It can suck up the iron block 20 times heavier. When the power is cut off, the U-shaped iron bar can't hold any iron. An ordinary iron rod.
The invention of Sterling's electromagnets led to the bright future of converting electrical energy into magnetic energy, a invention that soon spread in the United Kingdom, the United States, and some coastal countries in Western Europe.
In 1829, the American electrician Henry made some innovations on the Sterling electromagnet device. The insulated wires replaced the bare copper wires, so there was no need to worry about being short-circuited by the copper wires being too close. Since the wires have an insulating layer, they can be tightly wound together in a circle. The denser the coil, the stronger the generated magnetic field, which greatly improves the ability to convert electrical energy into magnetic energy. By 1831, Henry had prototyped a newer electromagnet. Although it was not large, it could suck up a ton of iron.
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