Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . will apply as given above. The end of the firstcoil is connected to the beginning of the second, and thejunction, to commutator bar No. 2, and so on, until the end-ing of the last coil is connected to the beginning of the firstcoil and to bar No. 1. Thismethod is outlined in the multi-polar ring armature in Fig. 359. 336. Armature Core Loss—Hysteresis.—The iron core of anarmature rotating in a two-polefield will be subjected to twoopposite magnetic inductions ineach revolution. For e
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . will apply as given above. The end of the firstcoil is connected to the beginning of the second, and thejunction, to commutator bar No. 2, and so on, until the end-ing of the last coil is connected to the beginning of the firstcoil and to bar No. 1. Thismethod is outlined in the multi-polar ring armature in Fig. 359. 336. Armature Core Loss—Hysteresis.—The iron core of anarmature rotating in a two-polefield will be subjected to twoopposite magnetic inductions ineach revolution. For example, consider the polarity of thecore at one instant during its revolution, Fig, 346 ; the left-hand side of the ring has a S-pole induced in it by the N-poleof the field magnet, while the right-hand side of the ringpossesses an induced N-pole from the S-pole of the fieldmagnet at the. same instant. At one-half revolution of thering from this point that part which previously possessed in-duced N-polarity is now inductively magnetised with aS-pole, and the other half, with a N-pole. The ring is thus. Fig. -Armature Core Loss-Hysteresis. 362 PRACTICAL ELECTRICITY.
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