TransactionsPublished under the care of the General Secretary and the Treasurer . Fig. 2. Field Potential and Current Curve of aClosed-Circuit Winding. determined from the field-curve. Fig. 2a; for between the brushi?i and, for example, the lamina 6, a mean is induced, theintensity of which is proportional to the shaded area B^-6. Thepotential curve of the commutator is consequently the summationor integral curve of the field curve. Even if the field curve devi-ates considerably from a sinusoid, the potential curve, in general,approaches a sinusoid. The brushes B^ and 5, stand in the ne
TransactionsPublished under the care of the General Secretary and the Treasurer . Fig. 2. Field Potential and Current Curve of aClosed-Circuit Winding. determined from the field-curve. Fig. 2a; for between the brushi?i and, for example, the lamina 6, a mean is induced, theintensity of which is proportional to the shaded area B^-6. Thepotential curve of the commutator is consequently the summationor integral curve of the field curve. Even if the field curve devi-ates considerably from a sinusoid, the potential curve, in general,approaches a sinusoid. The brushes B^ and 5, stand in the neutralzone of the field and consequently at the vertices of the potentialcurve. If a load is put on the direct-current machine, there flows ARNOLD AND LA COUR: COMMUTATION. 803 through both halves of the armature winding a constant cur-rent 1/2; under the brushes the current changes its one obtains for the value of the current in one turn at succes-sive instants the curve, Fig. 2c. This gives at the same time an idea. Fig. 3. Field Curves for No-Load attd When Loaded. of the mean current strength in the turns at every point of thearmature periphery. The armature current generates, therefore,a fixed field which is superposed upon the field of the magnetsystem. In Fig. 3, the curve I represents the field produced by
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