Magnet is objects can produce a magnetic field, a magnetic dipole, attracts the ferromagnetic material such as iron, nickel, cobalt and other metallic.
Pole judgement is a thin line hanging a magnet, pointing to the North Pole is called refers to the North Pole or N pole, pointing to the South Pole is refers to the South Pole or the S pole.
If the earth like a big magnet, the earth's magnetic North Pole is the N pole, the south poles is the S pole.
Magnet heteropolar attraction, homopolar exclusive.
Refers to the South Pole and attraction refers to the arctic, refers to the South Pole and refers to the Antarctic repel, refers to the North Pole and repel refers to the North Pole.
Common bar, shoe type, round ring, cylindrical, pie and so on.
Can shape according to customer's request, to any shape can be.
High frequency magnetic core is h, mountain glyph, circular, cylindrical, etc.
In 1822, French physicist arago and lu he found that when an electric current passes through the including iron winding, it can make the iron magnetization in the winding.
This is actually the principle of electromagnet initially found.
1823, sturgeon also conducted a similar experiment: he not is the u-shaped magnet stick in a piece of iron rod on 18 circle around the copper bare wire, copper wire and voltaic cell when switched on, around the u-shaped rods copper coils produced intense magnetic field, thus make U into a piece of iron bar & other;
Electromagnet & throughout;
The electromagnet on the magnetic energy to put many times larger than permanent magnet, it can suck up 20 times heavier than its iron, when the power cut off, it is what U iron bars iron also does not suck, back into a normal iron bar.
Sturgeon electromagnet inventions, make people saw the bright future to convert electrical energy into magnetic energy, the invention in Britain, the United States and Western Europe some coastal countries soon spread.
In 1829, the United States, electrical engineering Henry some reform of sturgeon electromagnet device, insulated wires instead of bare copper wire, so don't have to worry about copper conductor is too close to the short circuit.
Due to the wire with insulation layer, it can be going round tightly around them together, because of the coil is dense, the stronger the magnetic field, thus greatly improving the ability to convert electrical energy into magnetic energy.
In 1831, Henry developed a newer electromagnet, though its volume is not large, but it can suck up 1 tons of iron.
The invention of the electromagnet also make generator power has been greatly improved.
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