This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ...in the rotor, and the total rotor current is then the sum of the added component, and the corrective current shown in Figs. 50 and 51. It is evident that the corrective current in the rotor causes some copper loss in addition to that due to the stator current. However, the loss due to the magnetizing current is small ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ...in the rotor, and the total rotor current is then the sum of the added component, and the corrective current shown in Figs. 50 and 51. It is evident that the corrective current in the rotor causes some copper loss in addition to that due to the stator current. However, the loss due to the magnetizing current is small in comparison with the fullload stator loss, and since the corrective current in the rotor is considerably smaller than the stator magnetizing current, this added copper loss may well be neglected. It will be evident from what has just been said that the presence of the rotor corrective current will considerably complicate the exact computation of the magnetizing current of a commercial induction motor of two or three phases, and this difficulty will be considerably increased in the case of a motor having short-pitch windings. At least an approximate solution can be obtained in the following manner; In a threephase motor having say three slots per phase per pole, it will be evident that, with a uniformly revolving sinusoidal flux the e.m.f. in any slot will differ 20 degrees from that generated in a slot on either side of it. The currents, however, in three adjacent slots are the same, since all of these conductors are connected in series. We have shown that for the best operation, each current should differ from its neighbor by an angle corresponding to the angle of displacement of the coils along the core. We may consider then that in this particular case, the current in one of the three slots is in the correct phase while that in each of the adjacent slots differs by 20 degrees from the correct phase. The ampere-turns of each of these should therefore be multiplied by the cosine of 20 degrees. The equivalent magnetomotive force of the three ...
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Add this copy of The Induction Motor to cart. $18.00, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of The Induction Motor to cart. $28.30, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
