Magnets or magnetic objects refer to the substances that possess magnetism which allows these substances to attract and or repel other magnetic objects. Magnetic objects are all metals, but not every type of metals has magnetism. The metals that possess magnetism include iron and nickel. These types of metal produce a magnetic field due to their internal structure and they are not likely to lose their magnetism easily so to speak. Magnetism is useful in many industrial applications such as clamping and lifting. Yet, there are some circumstances where magnetism is unwanted and needs to be removed. A demagnetizer is a device used to remove magnetism from magnets or magnetic objects.
A demagnetizer takes magnetism away from a piece of magnetic object when magnetism is unwanted in a particular operation. Demagnetizers can be used to remove magnetism from large magnetic work pieces as well as smaller magnetic components. The demagnetizers used for demagnetizing smaller objects are called hand demagnetizers because they are lightweight and can be held by a single hand. On the other hand, the demagnetizers for larger work pieces cannot be operated by a single hand. Besides hand demagnetizers, another type of demagnetizer that is also commonly applied is the tunnel demagnetizer. Tunnel demagnetizers are able to handle smaller magnetic objects a hand demagnetizer cannot deal with.
The hand demagnetizers are the devices designed for quick demagnetization operations. These portable devices can be carried easily from site to site as long as demagnetization is required. The use of a hand demagnetizer is ideal for situations to which the use of other types of demagnetizer is inapplicable. For example, the hand demagnetizers are used when the magnetic objects are too big for tunnel demagnetizers to demagnetize or when parts of the machinery are required to be demagnetized. The hand demagnetizers are light weighted, compact and easy to operate and therefore practical for a wide variety of applications.
Magnetism is the force that exists in magnetic objects. The magnetic force allows these objects to attract or repel each other. Some magnetic objects have stronger magnetic force inherently while some have weaker magnetic force. Regardless of how powerful the magnetic force the objects have, their magnetism can all be removed by a hand demagnetizer. It is just a matter of how difficult it is to remove magnetism from them. The three types of magnets are the permanent magnets, temporary magnets, and electromagnets.
Permanent magnets have magnetism inherently because of their internal structure. They are made of ferromagnetic materials which grant them strong magnetic force which cannot be easily removed. The magnetic field is constantly and permanently produced by the ferromagnetic materials inside these objects. The magnetic fields presented in a material are called domains. A material displays the magnetic properties when the domains are aligned in the same direction. In permanent magnets, these domains are perfectly aligned and that is why they are much more stable against demagnetizing forces. It takes more time for a hand demagnetizer to remove the magnetism from a permanent magnet.
The internal structure of temporary magnets does not allow them to produce the permanent magnetic fields and they only display their magnetic properties under certain circumstances. Once these circumstances are lifted, temporary magnets lose their magnetic force. In most cases, the temporary magnets only become magnetic when they are exposed to a strong magnetic field. For example, screws or paper clips do not attract each other, but they attach to each other when placed near a permanent magnet. When the permanent magnet is moved away, they lose the magnetism again.
Electromagnets are the magnets that display their magnetic properties when an electric current passes through them. This type of magnet can be found in devices such as motors, generators, headphones and more. The application of electromagnets involves a ferromagnetic core and a coil of wire that winds around it. Similar to temporary magnets, the electromagnets only generate magnetic force under certain given situations. When the electric current is not presented, the magnetic force is lost.
The magnetic fields are generated when the domains are aligned into the same direction. When the domains are not aligned, the magnetic fields are lost consequently. This is the basic working principle of a demagnetizer. A demagnetizer consists of sets of coils. These coils project a strong magnetic field onto a magnetic object to change the direction of the magnetic domains. When the directions are changed, the magnets lose their magnetism.
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