By Massachusetts Institute Of Technology, Karl T. Compton
Rules of electric Engineering sequence.
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Additional resources for Magnetic circuits and transformers; a first course for power and communication engineers
Example text
4 0. 6 Normal doc magnetization curves for various magnetic materials. tandanf ..... �(} Note : · These are typical curves intended only Cor comparative purposes. For design use indio vidual cun'e oC material seleeted. 01 FIG. lSa . ;... , � ..... , � � � tti t:; � � Q) 18 1'1 16 16 14 13 ... :4. 2 . 1 1. 0 0. 9 ,.. S ! e = Q ... ,.. 7 ; a! 0. 6 . S 0. 2 0. 1 0 Courtuy c-l El-'e Co. -I--" 1/ t-1-- 1- S x IO' / 800 for permanent-magnet materials. 1- II--'- Irr � � <':I t ts � .! -' - � II ... J X Typical hysteresis loops o I J'......
Rolled sheet steel is a good il l u stra t io n of this condition a nd frequently exhibits \\"idely different magne t ic properties for different directions of magnetizat io n . t The su b ject of strains is closely connected with certain aspects of ferromag neti c theo r y . For instan c e , the m ag neti c forces in a crystal oc cu rring as a r e s u lt of the spins of the electrons arc balan ced by the el ectric forces o ccu rring as a result of t h e electric charges on th e electrons. When a rearrange ment of the magnetic vectors occurs, the ba lance between the m ag n eti c and electric forces is disturbed.
If the posi tive and the negative values of Xmax are e qu al , the loop is s ymm e t ri cal about the origin. The s t e e l is then in its symmetrically cy cl i cal ly magne tized cond ition, some t ime s abbreviated to cyclic condition, for the particular numerical va l u e and X Xmaxo Mention has already been made that the val u e s of ffi on the fall ing than those on the rising curve. Thus the material has the property of tending to oppose a change in the y,d u e of the flux density. This property is k n o w n as hys teresis, which is a term m e a n i ng a lagging behind.
