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. 1892 Excerpt: ...are magnetically excited, the poles are alternately north and south all round the frame on one side, and in opposition to each north pole in one half of the frame is a south pole on the other half of the frame. In the clearance space, therefore, between the poles there are a series of bunches Fiq. 129.--Half-Carcase or ...
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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. 1892 Excerpt: ...are magnetically excited, the poles are alternately north and south all round the frame on one side, and in opposition to each north pole in one half of the frame is a south pole on the other half of the frame. In the clearance space, therefore, between the poles there are a series of bunches Fiq. 129.--Half-Carcase or Magnet Frame of 1,250 H.P. Ferranti Alternator at Deptford. of lines of force alternately in opposite directions, and there is also a leakage field between the adjacent oppositely named poles on the same side. The armature shaft is a steel shaft having a grooved pulley keyed on it for rope driving, which is slung between two self-adjusting bearings. The steel shaft carries a gun-metal hub, or disc, which forms the basis of support for the armature coils. The armature winding has been developed from what used to be known as the zigzag armature winding, and is indicated as to its general nature by the diagram given in Fig. 130. Opposite to each magnetic pole stands one loop of the armature, and as the armature moves forward in the alternating field induction takes place in each loop in such a way that the currents induced in the loops are all in one direction during one step of the progress from pole to pole, and all in the other direction during the next successive step. The machines, therefore, yield an alternating current, the frequency of which is given Fig. 130.--Ferranti-Thomson Armature Winding. by the product of half the number of pole-pieces and the speed of revolution. This frequency is now in all machines 10,000 semi-alternations per minute, or 5,000 complete alternations, equivalent to a frequency of 83 - per second. In the actual machines, the various portions of the armature consist of a set of separate flat spirals of copper...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
