By Alexander Gray
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Additional resources for Electrical Machine Design The Design and Specification Of Direct And Alternating Current Machinery
12 at x\j 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 xised. If Fig. 13 be cut out and bent around a drum it will give the best possible representation of a drum winding. Inspection of Figs. 12 and 13 shows that, just as in the case of the simplex Gramme winding, there are two paths between the is + and the brush. BFUL 13. B4- Developed two-pole simplex singly re-entrant drum winding. The EJBLF. Equation. the ilux per pole which the number of poles, 12.
The is one pole pitch and are made on the same shown in place in Fig. 15, where coils are all alike former; a few of the coils are conductors that are in the top layer are represented by heavy lines while those in the bottom layer are represented by dotted lines. 14. Equalizer Connections. In the winding shown in Fig. 14 there and are. six paths in parallel between the 4- and the terminals, necessary that the voltages in all six paths be equal, otherwise circulating currents will flow through the machine.
Round wire it is advisable to put a layer of paper between Fig. 33 32. Coil for double layer FIG. 33. winding with two turns per them, as shown at a, Fig. coil and 8 cond. per 35 ; because the cotton covering Blot, may become damaged when the coils are squeezed together to get them slot. The voltage between adjacent turns of the into^the same coil is so low that the cotton on the conductor covering ample for insulating purposes. 38. Examples of Armature Insulation. The methods adopted in insulating coils, and the reasons for the various operations, can best be understood by the detailed of some actual is description examples.