TransactionsPublished under the care of the General Secretary and the Treasurer . e same as used in the reactancemethod, the values used being different. AF represents the arma-ture in phase with current, and AF the component of the RUSHMORE: REGULATION OF ALTERNATORS. 737 field necessary to balance it. AC, at right angles to Eq,is the field necessary for the useful flux R and AB^ is theresultant field Fig. 2 illustrates the combined method more completely. diagram is given in AOBC, in which AO is the actuallygenerated in the winding, and AC the ter
TransactionsPublished under the care of the General Secretary and the Treasurer . e same as used in the reactancemethod, the values used being different. AF represents the arma-ture in phase with current, and AF the component of the RUSHMORE: REGULATION OF ALTERNATORS. 737 field necessary to balance it. AC, at right angles to Eq,is the field necessary for the useful flux R and AB^ is theresultant field Fig. 2 illustrates the combined method more completely. diagram is given in AOBC, in which AO is the actuallygenerated in the winding, and AC the terminal with a powerfactor cos 7p. The effective assumed in phase with the use-ful flux is laid off on ON and the saturation curves of the wholemagnetic circuit and of the different parts are drawn, as shown. Thearmature OD is laid off at the angle (90 |-^) fromON and at right angles to OB. The value of the apparent arma-ture reaction as measured by short-circuited armature is given asOK. The real armature is equal to OJ, the difference,. Fig. 5.— Derivation of reactance diagram. JK=OG, being the required to generate an , OZ =00, being that required to send full-load current through the arma-ture impedance; MB,^ is the terminal The necessaryfor generating the real generated , AO =NB^, is ON, whichcombined with the of armature reaction gives NB = OB asthe resultant field for full load. If the pole cores amd yokeare worked at a high degree of saturation, a considerable increasein leakage factor occurs from no load to full load, as explainedunder the subject of primary leakage. Of the total drop in vol-tage, r r\; /,? ^3 is due to the resistance and reactance of thearmature circuit, /j r, to armature and / /^ to the in-creased leakage at full 1 — 47 I (38 RUSHMORE: REGULATION OF ALTERNATORS. Reactance Method ^ ^ ^ ^- ^ =*. The similarity in effect of armature reactance and self-induc
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