elte 114 final
Terms
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- = I*E I is the amount of current flowing through N turns of wire. Measured in Ampere-turns (A.t)
- Magnetomotive Force(mmf)
-
is a measure of the ability to concentrate magnetic fields. This drops drastically at saturation.
(B = u * H or u = B/H) - Permeability (u)-
- used to show how much flux density (B) resultsfrom increasing the amount of field intensity (H)
- B-H magnetic curve -
- The effect of little change in field intensity increases.
- Saturation-
- when flux lags the increase or decreases in magnetic force.
- Hysteresis
-
= mmf/flux
opposition to the production of flux in a material, it is comparable to resistance. It is inveresly proportional to preameability. R= 1/P - Reluctance(R)-
- demagnatizing using an alternating current.
- Degausing
- its equal to mmf/Length. Shorter magnetic circuits produce a greater field intensity.
- Field Intensity (H)-
- is comparable with conductance in a n electrical circuit, and is the inverse of reluctance. P= 1/R
- Permeance(P)
- Current = Voltage/Resistance Flux = Magnetomotive Force /Reluctance
- Formula for Ohm’s Law in magnetic circuits: