Alternating Current Machines Being the Second volume of Dynamo Electric Machin
Alternating Current Machines Being the Second volume of Dynamo Electric Machin
Samuel Sheldon
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(a) Measure the coefficient of self-induction of the fine wire coil of a i to 2 transformer by either of the methods of Exp. 5. This current must be made to vary by suitable steps, and this can most easily be done by applying differ- ent pressures to the coil. A wide assortment of pressures can be obtained by using different brushes of the converter supplying the energy, and the different steps of the i, 2, 3, 4 transformer. Determine the value of L for each TESTS. of the conditions, and plot a... curve having these values as ordinates, and the corresponding currents used in measur- ing as abscissae. A curve, such as Fig. 160, will result . 34 w-30 v or 2 u t 22 . 5 1. '5 2 2. 5 MAGNETIZING- CURRENT. AMPERES Fig. 160. 3. 5 with certain irons if the current be started low enough. The sharp, . Rise of the curve at first is due to the fact that at very low densities the permeability increases with density, as is shown in the curves on page 24, Vol. I. 'NAAA/W Reo Fig. 161. (b] Arrange the apparatus as in Fig.
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