By Massachusetts Institute Of Technology, Karl T. Compton
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Extra resources for Magnetic circuits and transformers; a first course for power and communication engineers
In some communications equipment, a material having an extremely high permea bili ty is desirable. For such appl ica ti ons, certain nickel-iron alloys, known as P ermall oy s 1 8 , 1 9 (permeability alloy) or Hip ern i k in the United States, or a nickel-iran-copper alloy, known as l\Iumetal20 and developed in England, may be used . The use of these alloy s i n volves an increased cost per pound of material but not of cost per unit of inductance. • Representative values of core loss for symmetrical cyclic magnetization and repre of resistivity for average samples of various materials are tabulated in Art.
In many magnetic problems, the histo ry of the material is un k nown . Ex isting magnetization may then have o ccurred by an increase of the magnetizing force from a small value up to the value under consider ation, or by a decrease from a larger value. l\Iany magnetic calculations are therefore performed using a magnetization curve, called the normal magnetization curve, which is obtained by drawing a si n gl e- val ue d curve through the tips of a series of increasingly larger symmetrical hysteresis loops.
Although the word hysteresis implies a ti m e lag, t he hysteresis phe nomenon docs not depend on time bu t only on whe ther the magnetizing force is d e cre as i ng or i n c r e a s i ng . If a t any instant the m ag n e ti z i n g force is raised to a new value, and the magnetic material is n o t jarred, the flux density a p p a r en t ly n e yer i n cr e a s e s aboye o r settles be low its new initial value. The h ys t e r e s i s phenomenon resu lts in a dissipation o f energy, c a l led hys teres is loss, wi th i n t h e material when cyclic variations of magn e t i zi n g force arc considered.