Download Bees of the World by O'Toole C., Raw A. PDF

By O'Toole C., Raw A.

ISBN-10: 0816057125

ISBN-13: 9780816057122

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Example text

Fig. 13 is another method adopted to show the connections of the same winding and is obtained by splitting Fig. 12 at xy and opening it out on to a plane. This gives what is called the developed winding and shows clearly the shape of the coil which used. If Fig. 13 be cut out and bent around a drum it will give the best possible representation of a drum winding. is Inspection of Figs. 12 and 13 shows that, just as in the case of the simplex Gramme winding, there are two paths between the brush.

The armature coils are held against centrifugal force by steel band wires, five sets of which are shown. 24. Poles and Yoke. The armature revolves in the magnetic field produced by the exciting coils A which are wound on and insulated from the poles B. In Fig. 27 the poles are of circular cross-section so as to give the required area for the flux with the minimum length of mean turn of the field coil. 025 in. thick, to prevent, as far as possible, eddy currents in the pole faces. The pole face laminations are stacked up to give the necesand are held together by four rivets.

G) Rotate the armature, while it is still hot, at a high speed so as to get rid of the excess of compound which will otherwise come out some day when the machine is carrying a heavy load. INSULATION 39 Paint the end connections with elastic finishing varnish taking care to get into all the corners. 39. Total Thickness and Apparent Strength of Slot Insulation. (h) Example 1, Fig. 34. In the above table under the heading of width is given the space taken up in the width of the slot by the different layers of insulation.

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