An elementary book on electricity and magnetism and their applications . No. n Fig. 266. — Diagram ofa statorwindings. with two ALTERNATING-CURRENT MOTORS 391 quarter of a cycle (90°)? later, we see from the current curvesthat current I has dropped to zero and current II is at a maxi-mum. This brings the north pole of the stator to the rightside (Fig. 267 B). Again, a quarter of a cycle (90°) later, we. a b c D Fig. 267. — Revolving magnetic field of a two-pole two-phase induction motor. find that current I has reached a maximum in the oppositedirection and current II has dropped to zero, whic
An elementary book on electricity and magnetism and their applications . No. n Fig. 266. — Diagram ofa statorwindings. with two ALTERNATING-CURRENT MOTORS 391 quarter of a cycle (90°)? later, we see from the current curvesthat current I has dropped to zero and current II is at a maxi-mum. This brings the north pole of the stator to the rightside (Fig. 267 B). Again, a quarter of a cycle (90°) later, we. a b c D Fig. 267. — Revolving magnetic field of a two-pole two-phase induction motor. find that current I has reached a maximum in the oppositedirection and current II has dropped to zero, which brings thenorth pole of the stator around to the bottom, as shown infigure 267 C. Finally, a quarter of a cycle (90°) later, we findthe north pole on the left side of the stator, as shown in figure267 D. Evidently the north pole is traveling around thestator and will make a complete circuit for each completecycle of the current. From this study it may be seen that,although the windings are stationary, a revolving magneticfield is produced, which by more careful analysis can be provedto be constant and which makes one revolution while the currentin one line wirepasses throughone cycle. In the case ofa three-phasemotor we havethree currentswhich differ inphase by one third of a cycle or 120 degrees, as shown in the curves in figure268. The diagram of the windings for a two-pole three-phase KA
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
