|
|
|
Glossary of terms for the magnetics industry Select a letter: A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z R Radiated Interference EMI radiated through air. Reactance The apparent "resistance" that a capacitor or an inductor provides to a circuit. Rectangularity Ratio See squareness ratio. Rectangular Loop See square loop. Rectifier Is any device, which presents a different resistance to the flow of an electric current when the direction of the current is reversed. Rectifier Transformer A transformer designed to produce a DC voltage when used with a rectifier circuit (changes AC to unregulated DC). Depending upon the type of rectifier, it may be necessary for the core to accommodate a DC bias. Regulation In transformer design, the percentage of the total power rating that is winding loss. This is significant because it indicates how much the output voltage will change as the load goes from no-load to full load. Relative Permeability The permeability of a material compared with the permeability of free space. This is what normally is specified as material permeability. Reluctance Somewhat analogous to electrical resistance, it is the quantity that determines the magnetic flux, ø, resulting from a given magnetomotive force, F. R = Fø where: R = reluctance, in gilberts per maxwell F = magnetomotive force, in gilberts ø = flux, in maxwells Remanence The magnetic induction remaining in a material when the magnetizing force has been reduced to zero. Also called "remanent induction". Residual Flux The flux that remains in a core when the applied MMF is returned to a value of zero. Resistance The property of a circuit or element which determines for a given current the rate at which electrical energy is converted to heat in accordance with the formula W = I x I x R. The practical unit is OHM. Return Path A magnet typically forms only part of the magnetic circuit. Soft magnetic materials such as steels are used to carry the magnetic flux to the gap or working region for interaction with other components. This conductor of magnetic flux is referred to as the return path. It is usually designed to minimize fringing and leakage flux. RF Transformer Radio Frequency Transformer Reversible Temperature Coefficient Changes in flux which occur with temperature change. They are spontaneously regained when the temperature is returned to its original point. There are two values reported: Reversible Temperature Coefficients of Inductance (Br) and of Coercivity (Hci). The temperature range over which they have been measured and specified should be stated. Most materials exhibit a non-linear response with temperature. Round Loop Refers to a hysteresis loop where the difference between Bm and Br of a material is large, resulting in a rounded appearance. Please send all web related questions/comments to the Webmaster. TOP | BACK | HOME | HELP | MAP | CONTACT |
