Errors in Magnetic Testing With Ring Specimens (Classic Reprint) - Softcover

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Excerpt from Errors in Magnetic Testing With Ring Specimens

In determining the hysteresis of a ring specimen, two methods are available. The one is to determine corresponding values of H0 and Bo, plat a curve between them, and measure the area of this curve. This method involves the same errors as the determination of permeability. The other method is to measure the electrical energy supplied to the ring and at the same time Bo. Alternating currents are usually used for this purpose, and this requires the determination of the form factor of the induced electromotive force in order to know the maximum value attained by Bo.6 Secondly, eddy currents are induced in the specimen, but if not large can be approximately determined and separated by measurements at two frequencies. Moreover, on account of the nonuniform distribution of the flux in the section of the ring, the power expended is not the same as it would be if the distribution were uniform. This is owing to the fact that the energy per cycle is not proportional to the flux density B, but to some power of it, approximately 32 for eddy cur rents and bl6 for hysteresis. Here, again, the average value of B) is not the same as the 1.6th power of the average B.

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