How Domains Change In A Hysteresis Loop
Affiliate: Measurements and Instrumentation : Electrical and Electronics Instruments
Method of reversals and Determination of Hysteresis Loop
A band shaped specimen whose dimensions are known is used for the purpose After demagnetizing the test is started by setting the magnetising electric current to its lowest exam vlane. With galvanometer key Chiliad closed, the iron specimen is brought into a ' reproducible circadian magnetic state' by throwing the reversing switch S backward and forward nearly twenty times. Key K is now opened and the value of flux corresponding to this value of H is measured by reversing the switch S and noting the throw of galvanometer. The value of flux density corresponding to this H can be calculated past dividing the flux by the surface area of the specimen. The above procedure is repeated for various values of H up to the maximum testing signal. The B-H curve may be plotted from the measured values of B corresponding to the various values of H. The circuit for this examination is shown in Fig. The magnetizing winding is supplied through a potential divider having a large number of tapping. The tappings are arranged so that the magnetizing force H may exist increased, in a number of suitable steps, up to the desired maximum value. The specimen before being tested is demagnetized. The tapping switch S is attack tapping I and the switch S is closed. The throw of the galvanometer respective to this increment in flux density in the specimen, course zero to some value B, is observed. Later on reaching the point of maximum H i.eastward... when switch S is at tapping 10, the magnetizing electric current is side by side reduced, in steps to nix by moving switch two downward through the tapping points ix, viii, seven 3, 2, 1. After reduction of magnetizing strength to nil, negative values of H are obtained by reversing the supply to potential divider and then moving the switch South upwards again in gild 1, 2, iii 7, 8. 9, 1O. This test is done by ways of a number of steps, only the change in flux density measured at each pace is the change from the maximum value + Bm downward to some lower value. But before the next stride is commenced the iron specimen is passed through the remainder of the cycle of magnetization back to the flux density + Bm. Thus the cyclic state of magnetization is preserved. The connections for the method of reversals are shown in Fig. Determination of B-H curve
Method of reversals
Step past step method
Step by pace method
Determination of Hysteresis Loop
Method of reversals
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Measurements and Instrumentation : Electrical and Electronics Instruments : Determination of B-H curve and Hysteresis Loop |
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