Magnetic circuit in the context of "Magnet keeper"

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⭐ Core Definition: Magnetic circuit

A magnetic circuit is made up of one or more closed loop paths containing a magnetic flux. The flux is usually generated by permanent magnets or electromagnets and confined to the path by magnetic cores consisting of ferromagnetic materials like iron, although there may be air gaps or other materials in the path. Magnetic circuits are employed to efficiently channel magnetic fields in many devices such as electric motors, generators, transformers, relays, lifting electromagnets, SQUIDs, galvanometers, and magnetic recording heads.

The relation between magnetic flux, magnetomotive force, and magnetic reluctance in an unsaturated magnetic circuit can be described by Hopkinson's law, which bears a superficial resemblance to Ohm's law in electrical circuits, resulting in a one-to-one correspondence between properties of a magnetic circuit and an analogous electric circuit. Using this concept the magnetic fields of complex devices such as transformers can be quickly solved using the methods and techniques developed for electrical circuits.

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👉 Magnetic circuit in the context of Magnet keeper

A magnet keeper, also known historically as an armature, is a bar made from magnetically soft iron or steel, which is placed across the poles of a permanent magnet to help preserve the strength of the magnet by completing the magnetic circuit; it is important for magnets that have low magnetic coercivity, such as alnico magnets (0.07T).

Keepers also have a useful safety function, as they restrict external metal from being attracted to the magnet. Many magnets do not need a keeper, such as neodymium magnets, as they have very high coercivities; only those with low coercivities, meaning that they are more susceptible to stray fields, require keepers.

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Magnetic circuit in the context of Maxwell's equations

Maxwell's equations, or Maxwell–Heaviside equations, are a set of coupled partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, electric and magnetic circuits. The equations provide a mathematical model for electric, optical, and radio technologies, such as power generation, electric motors, wireless communication, lenses, radar, etc. They describe how electric and magnetic fields are generated by charges, currents, and changes of the fields. The equations are named after the physicist and mathematician James Clerk Maxwell, who, in 1861 and 1862, published an early form of the equations that included the Lorentz force law. Maxwell first used the equations to propose that light is an electromagnetic phenomenon. The modern form of the equations in their most common formulation is credited to Oliver Heaviside.

Maxwell's equations may be combined to demonstrate how fluctuations in electromagnetic fields (waves) propagate at a constant speed in vacuum, c (299792458 m/s). Known as electromagnetic radiation, these waves occur at various wavelengths to produce a spectrum of radiation from radio waves to gamma rays.

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LINKED FROM (PARENTS)
← Maxwell's equations ← Magnet keeper ← Maxwell equations
LINKS TO (CHILDREN)
Electric battery → Resistor → Leakage flux → Magnetic flux → Permanent magnet → Electromagnet → Magnetic core → Ferromagnetic material → Magnetic field → Electric motor → Electric generator → Transformer → Relay → SQUID → Galvanometer → Recording head → Magnetomotive force → Magnetic reluctance → Magnetic saturation → Hopkinson's law → Ohm's law →