permanent magnet designed for use in a DC magnetic field in the electrical, automatic, radio and other devices.Moreover, it allows you to considerably reduce their size and weight, while increasing the autonomy and reliability.There remanence material for production is always higher with respect to the magnetic flux density.One of the most effective methods of obtaining energy generator is a permanent magnet.This can be explained by the fact that the segments are included in the magnetic field, commute with a very low cost, due to the formation of poles of the polarity opposite to the main magnet.This results in ejecting the segment.In the event that there is another similar item starting kinematic magnetic swing, the principle of which is reduced to the movement in the protivohode.This in turn significantly simplifies the process of entering into the magnetic core of this segment.
production
Permanent magnets can be magnetized in pulsed and in a constant field.The intensity of the latter depends on the shape, size and brand of device.Very important nuance in this case it is a level of resistance to the effects of various external factors.First of all it concerns the temperature and demagnetizing fields.At the same time we should not forget about the shock and vibration.As regards shapes and sizes, they only depend on the manner in which one was obtained a permanent magnet.Among them are the plastic deformation, casting, vacuum deposition and powder metallurgy.Based on the method of production, the device has four species, of which more will be discussed further.
Species
deformable permanent magnet occurs as a result of pressure or cutting tool.Its high technological competitiveness and provides a device can be used in line sizes up to 30 mm.Due to this, it is often used in the electro-mechanical clock.Cast options are processed due to the abrasive grinding and stand out among other species by the fact that in terms of size and shape have significant limitations.From this perspective, it is possible to meet them in the form of staples, bars, rings, cylinders, and so on.The main advantage of this type of device is that the working volume of extended very much, which ensures high efficiency.A permanent magnet is applied often in magnetrons, klystron high power and in a backward wave.Spraying is carried out on the substrate, which serve as part of the magnetic circuit, rather their surface.Their final magnetic characteristics of the device obtained as a result of heat treatment.Typically, they are used in structures and electrical delay filters.Due powder metallurgy on the basis of rare earth permanent magnets are splechёnnye.Their key characteristics - a high resistance to demagnetization, low cost, compared to other species, and simple production technology.This makes them dominant by volume of the issue.
