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Electropermanent Magnet
An electropermanent magnet or EPM is a type of permanent magnet in which the external magnetic field can be switched on or off by a pulse of electric current in a wire winding around part of the magnet. The magnet consists of two sections, one of "hard" (high coercivity) magnetic material and one of "soft" (low coercivity) material. The direction of magnetization in the latter piece can be switched by a pulse of current in a wire winding about the former. When the magnetically soft and hard materials have opposing magnetizations, the magnet produces no net external field across its poles, while when their direction of magnetization is aligned the magnet produces an external magnetic field. Before the electropermanent magnet was invented, applications needing a controllable magnetic field required electromagnets, which consume large amounts of power when operating. Electropermanent magnets require no power source to maintain the magnetic field. Electropermanent magnets made wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Permanent Magnet
A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include the elements iron, nickel and cobalt and their alloys, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EPM 6
EPM may refer to: Management * Enterprise performance management * Enterprise project management * Elsevier performance manager Education * École Polytechnique de Montréal, now Polytechnique Montréal, an engineering school in Canada * Escola Portuguesa de Moçambique, a Portuguese school in Maputo, Mozambique * Macau Portuguese School (Portuguese: ') Science and technology * Electronic protective measures * Electropermanent magnet * Elevated plus maze, a rodent-based model of anxiety * Equine protozoal myeloencephalitis * Ethylene propylene rubber * European Physiology Modules, an International Space Station payload * Evolved psychological mechanism * Electropositive metal, in electropositive shark repellent Other uses * EPM (cycling team), a Colombian cycling team * European power metal, a sub-genre of power metal * '' Extreme Power Metal'', an album by power metal band DragonForce * Eastport Municipal Airport, in Maine, United States * Empresas Públicas de M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halbach Array
A Halbach array is a special arrangement of permanent magnets that augments the magnetic field on one side of the array while cancelling the field to near zero on the other side. This is achieved by having a spatially rotating pattern of magnetisation. The rotating pattern of permanent magnets (on the front face; on the left, up, right, down) can be continued indefinitely and have the same effect. The effect of this arrangement is roughly similar to many horseshoe magnets placed adjacent to each other, with similar poles touching. The principle was first invented by James (Jim) M. Winey of Magnepan in 1970, for the ideal case of continuously rotating magnetization, induced by a one-sided stripe-shaped coil. The effect was also discovered by John C. Mallinson in 1973, and these "one-sided flux" structures were initially described by him as a "curiosity", although at the time he recognized from this discovery the potential for significant improvements in magnetic tape techno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetic Base
A magnetic switchable device (often called a magnetic base) is a magnetic fixture that uses one or more permanent magnets in a configuration that allows the external field to be turned on or off. They are used in many applications including optics, metalworking, lifting, and robotics, to attach items to metal surfaces in a secure but temporary way. The magnetic base may have a ''V'' cut into the bottom of the base or the back. This ''V'' allows the base to be attached to a round bar such as the column of a drill press or a pipe. One type of magnetic switchable device is made from two blocks of iron, with a round cavity bored through the centre. The halves are joined together with a non-ferrous material such as brass or aluminium Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. I .. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole in the center of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet. The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field. Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnet
A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include the elements iron, nickel and cobalt and their alloys, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond wea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EPM 8
EPM may refer to: Management * Enterprise performance management * Enterprise project management * Elsevier performance manager Education * École Polytechnique de Montréal, now Polytechnique Montréal, an engineering school in Canada * Escola Portuguesa de Moçambique, a Portuguese school in Maputo, Mozambique * Macau Portuguese School (Portuguese: ') Science and technology * Electronic protective measures * Electropermanent magnet * Elevated plus maze, a rodent-based model of anxiety * Equine protozoal myeloencephalitis * Ethylene propylene rubber * European Physiology Modules, an International Space Station payload * Evolved psychological mechanism * Electropositive metal, in electropositive shark repellent Other uses * EPM (cycling team), a Colombian cycling team * European power metal, a sub-genre of power metal * '' Extreme Power Metal'', an album by power metal band DragonForce * Eastport Municipal Airport, in Maine, United States * Empresas Públicas de M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EPM 7
EPM may refer to: Management * Enterprise performance management * Enterprise project management * Elsevier performance manager Education * École Polytechnique de Montréal, now Polytechnique Montréal, an engineering school in Canada * Escola Portuguesa de Moçambique, a Portuguese school in Maputo, Mozambique * Macau Portuguese School (Portuguese: ') Science and technology * Electronic protective measures * Electropermanent magnet * Elevated plus maze, a rodent-based model of anxiety * Equine protozoal myeloencephalitis * Ethylene propylene rubber * European Physiology Modules, an International Space Station payload * Evolved psychological mechanism * Electropositive metal, in electropositive shark repellent Other uses * EPM (cycling team), a Colombian cycling team * European power metal, a sub-genre of power metal * '' Extreme Power Metal'', an album by power metal band DragonForce * Eastport Municipal Airport, in Maine, United States * Empresas Públicas de M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EPM 5
EPM may refer to: Management * Enterprise performance management * Enterprise project management * Elsevier performance manager Education * École Polytechnique de Montréal, now Polytechnique Montréal, an engineering school in Canada * Escola Portuguesa de Moçambique, a Portuguese school in Maputo, Mozambique * Macau Portuguese School (Portuguese: ') Science and technology * Electronic protective measures * Electropermanent magnet * Elevated plus maze, a rodent-based model of anxiety * Equine protozoal myeloencephalitis * Ethylene propylene rubber * European Physiology Modules, an International Space Station payload * Evolved psychological mechanism * Electropositive metal, in electropositive shark repellent Other uses * EPM (cycling team), a Colombian cycling team * European power metal, a sub-genre of power metal * '' Extreme Power Metal'', an album by power metal band DragonForce * Eastport Municipal Airport, in Maine, United States * Empresas Públicas de M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetic Field
A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. A permanent magnet's magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets. In addition, a nonuniform magnetic field exerts minuscule forces on "nonmagnetic" materials by three other magnetic effects: paramagnetism, diamagnetism, and antiferromagnetism, although these forces are usually so small they can only be detected by laboratory equipment. Magnetic fields surround magnetized materials, and are created by electric currents such as those used in electromagnets, and by electric fields varying in time. Since both strength and direction of a magnetic field may vary with location, it is described mathematically by a function assigning a vector to each point of space ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Permendur
Permendur is a cobalt-iron soft ferromagnetic alloy with equal parts of cobalt and iron which is notable for its high magnetic saturation level. Its saturation flux density of around 2.4 tesla is the highest of any commercially available metal. Coupled with its low coercivity and core losses, its high saturation and permeability makes Permendur useful as magnetic cores in transformers, electric generators and other electrical equipment. The advantage of high saturation in a magnetic core is that it can function at higher magnetic field strengths, so the core can be smaller and lighter for a given magnetic flux and power level. Permendur is used for magnetic cores and pole pieces in lightweight transformers and electric motors used in aircraft. The alloy was invented in 1929 by Gustav Elmen at Bell Telephone Laboratories. Various formulations are sold under different trade names. Cobalt-iron alloys like permendur have very high Curie temperatures so they can function ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EPM 4
EPM may refer to: Management * Enterprise performance management * Enterprise project management * Elsevier performance manager Education * École Polytechnique de Montréal, now Polytechnique Montréal, an engineering school in Canada * Escola Portuguesa de Moçambique, a Portuguese school in Maputo, Mozambique * Macau Portuguese School (Portuguese: ') Science and technology * Electronic protective measures * Electropermanent magnet * Elevated plus maze, a rodent-based model of anxiety * Equine protozoal myeloencephalitis * Ethylene propylene rubber * European Physiology Modules, an International Space Station payload * Evolved psychological mechanism * Electropositive metal, in electropositive shark repellent Other uses * EPM (cycling team), a Colombian cycling team * European power metal, a sub-genre of power metal * '' Extreme Power Metal'', an album by power metal band DragonForce * Eastport Municipal Airport, in Maine, United States * Empresas Públicas de M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
