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Glossary - R |
Rare earth
Reluctance R
Residual induction (Br)
Reversible losses
Rogowski coil
Rare earth
Set of elements with similar chemical and physical characteristics. Their electronic configurations gives them magnetic properties. Some of them (Sm, Nd) with transition metals (Fe, Co) give the most powerful permanent magnets (see also NdFeB, Sm-Co).
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Reluctance R
In a magnetic circuit, it is the analogous to the resistance in an electrical circuit. It is proportional to the length of magnetic path and inversely proportional to the cross section and permeability.
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Residual induction (Br)
It is the remaining magnetisation in a magnetic material, which has been magnetised to saturation in a closed circuit, when the magnetization field H is zero.
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Reversible losses
Reversible losses are changes of magnetic properties that are recovered returning in the initial condition. For example, reversible losses of Br at high temperature can be recovered returning to room temperature.
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Rogowski coil
Closely and evenly wound coil of N turns/m on a non-magnetic, usually plastic, former of constant cross sectional area. The most commonly application is the Rogowski current transducers.
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