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The permanent magnet generator is a synchronous machine where the rotor windings has been replaced with permanent magnets. This eliminates the excitation loses in the rotor, which otherwise typically represent 20-30% of the total generator loses. The reduced losses also give a lower temperature rise in the generator, which means that a smaller and simpler cooling system can be used.
The temperature reduction in the rotor also reduces the temperature in the bearings, improving reliability by increasing the lifetime of the bearing and bearing grease.
Wiki User
∙ 9y ago
Wiki User
∙ 14y agoA permanent magnet is a magnet that has been manufactured to "permanently" hold its magnetic field. Ferromagnetic material of a desired shape is heated above its Curie point, exposed to a large electromagnetic field, and cooled slowly while being held in that field. This allows the magnetic domains in the material to align themselves with the field of the electromagnet. Further, when the material cools below its Curie point, the magnetic domains will remain in the position they are in when the electromagnet is shut off. The magnet is now a permanent magnet; the magnet "holds" the magnetic field "imprinted" on it.
Wiki User
∙ 9y agoThat refers to a machine that uses a permanent magnet. A permanent magnet - as opposed to an electromagnet - is one whose magnetism doesn't depend on a normal electric current flowing through it.
Wiki User
∙ 14y agodfkdv dfkvfdvmf,.vmdfsklv mv kds fkm vkds;v dsklv
Wiki User
∙ 8y agoIt means that it doesn't quickly lose its magnetism. This is in contrast to an electromagnet, which loses most of its magnetism as soon as the current is turned off.
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Is magnetite a magnet?
No, it's a permanent magnet. It consists of an iron oxide, and iron is a permanent magnet.
Are permanent magnets are used in doorbells?
no it is not . a temporary magnet is used instead. If you use a permanent magnet, the doorbell will keep on ringing
Is iron a permanent magnet?
Yes, as it is a magnet that will remain for a long time that makes it permanent. : ) x
What is the material used in permanent magnet?
ferromagnetic
Which of the following can be done to demagnetize a permanent magnet?
heating the magnet past the Curie point
How is a electromagnet diffrent then a permanent magnet?
By definition an electromagnet is only working when it has a supply of electricity, a Permanent Magnet is always a magnet
Is the magnet in a compass a permanent magnet or electronic?
A. Compasses typically use a permanent magnet.
Is magnetite a magnet?
No, it's a permanent magnet. It consists of an iron oxide, and iron is a permanent magnet.
Is a needle in a compass a permanent magnet?
Yes, it is a permanent magnet.
Is magnetite a temporary magnet?
No, it's a permanent magnet. It consists of an iron oxide, and iron is a permanent magnet.
What distinguishes a permanent magnet from a temporary magnet?
Permanent magnets do not lose their magnetic ability. Temporary magnets, however, gain magnetic properties when they are touched or moved by a permanent magnet. The properties of a temporary magnet dissipates over time after the permanent magnet is removed.
Is the magnet in a compass a permanent magnetic or an electromagnet?
PermanentThere is no source of current in a compass, therefore the magnet is a permanent magnet.
Is a Refrigerator magnet a Permanent magnet?
yes
An example of a permanent magnet?
An example of a permanent magnet would be the Earth. The Earth is one giant magnet with opposite poles.
Is a permanent magnet called a hard magnet or a electromagnet?
Perminant magnet
Why is a permanent magnet hard to magnetize?
You cannot magnetize a permanent magnet because it is already magnetized.
Is the magnet in a compass a permanent magnet or a electromagnet?
It is a permanent magnet. Electromagnets(as the name suggests) requires an electric source to become a magnet, when the power source is turned off it will not function as a magnet.
