Items related to The steam turbo-alternator; a treatise for central...
The steam turbo-alternator; a treatise for central station engineers and operators, designers and engineering students, dealing with the various types ... and their control gear in present day use - Softcover
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. 1921 edition. Excerpt: ... rings which is dependent upon the position of the tappings relative to the magnetic poles. If the tappings lie right across the pole centres, there will be formed two parallel paths each consisting of a number of turns in series; and the induced in each will be opposite in polarity, so that there will be a current available ORDINARY DIRECT CURRENT TAPS IN MAXIMUM E.M.F. POSITION RING ARMATURE WINDING at the collecting rings of twice the value of that of each of the coils. While the taps are in this position, the will be at a maximum, as will be seen from Fig. 70. Assuming next that the armature is rotated through 90, as in Fig. 71, it will be seen that the at the sliprings is now zero, since there are an equal number of tums TAPS IN MINIMUM POSITION (Same armature winding as before, tapped for single-phase working) under each pole having E.M.F.'S generated in them in opposite directions. That is, the upper half of the winding has an induced in it which is equal and opposite to that in the lower half. At intermediate points between the two positions, there will appear an at the slip-rings dependent upon the position of the taps. At intermediate points between the maximum and zero values, it will be noticed that there are reverse E.M.F.'s operating owing to the winding overlapping the two poles; and this illustration (Fig. 72) clearly illustrates what takes place with a single-phase alternator, unless suitable precautions are taken to avoid it by breaking up the winding into groups with intermediate empty slots, as in Fig. 73. Z? /'?L Fla 72 Fro. 73 SINGLE-PHASE WINDING SINGLEPHASE WINDING ARRANGED TO ELIMINATE (Showing differential action of windings) DIFFERENTIAL ACTION Figs. 74 and 75 show ring windings arranged to give singleand...
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 1236494687
- ISBN 13 9781236494689
- BindingPaperback
- Number of pages66
(No Available Copies)
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