Magnetic circuits and transformers; a first course for power by Massachusetts Institute Of Technology, Karl T. Compton

By Massachusetts Institute Of Technology, Karl T. Compton

Rules of electric Engineering sequence.

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Sample text

Mumetal . . '. . . 4-79 Mo-Permalloy. . ' . High-Silicon Steel . . . Low-Silicon Steel " . . . Permendur . ". . . . 7-70 Perminvar . . . . . . 45-25 Penninvar ' . . Conpemik = y : : : : ffi, and Xc from ffi- Mo-P Cast Steel . . . IeritJls Alnico V Cast . • . . . Fe, Co, Ni, AI, Cu Honda Metal . . . . Fe, Co, Ni, Ti, AI Alnico II Cast . . • . Fe, Ni, Co, AI, Cu Alnico I Cast . . . . Fe, Ni, AI, Co Mishima Metal . . . . ' Fe, Ni, AI Remalloy . . . . .

Fe, W, C Chrome Steel . . . . Fe, Cr, C, Mn tData for Table I taken chiefly from reference 12, COIl cenI8/lb 7 3 28 18 27 32 8 7 69 3S SO 18 1 1 40 See p. 28. I I ! I I :... - � @ 5:' :::,. , tli � ..... ::0- s:; I'\) " (8 PROPER TIES OF FERROMA GNE TIC MA TERIA LS [Ch. l The cha rac t eris tics tabulated for the magnetically soft materials are : the maximum intrinsic flux d ensity {3max, the residual flux d en sity $T I the coercive for ce Xc (al s o the reten tivi ty and the coercivity re spe c ti vely sin ce th e symme trical cyclic magnetization was ca rri e d t o s a tu ra tion , except as not e d ) , the maximu m and initial p erm eabi l i ti es /lmax and /li, and the cost of the raw m a t eri al .

F, p ut tin g the s a mpl e in cyclic condition by several reversals of S1 , and then taking data as for Art. 5] 31 j"\JA GNE TI C TESTING n o rm a l magnetization cu rve is the locus of point� the broken li n e in Fig. 1 7 . When a hysteresis loop i s t o be d e termined, the cyclic condition is first established at the desired value of ill m ax . The rheostat RT is set to the first point. The pl o tt e d from these d ata as indicated by - - - - - - - - - -- FIG. 1 7. ,.. - - - - - - Poi nt s o n hysteresis and normal magnetization curves obtained with perrneameter small decrease in the r e ading of amm e t e r A when S2 is open ed .

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