Electrical and magnetic calculations by Atkinson Albert Algernon 1867-

Author:Atkinson, Albert Algernon, 1867- [from old catalog]
Language: eng
Format: epub
Tags: Electricity
Publisher: New York, D. Van Nostrand company
Published: 1913-03-25T05:00:00+00:00

This is also the length of the armature core. The circumference of the pole circle is therefore 20 x 2 x 6 =

240 cm

Fig. 10 (a).

-s- 3.1416 = 76.4 cm. Allowing an air gap of 0.2 cm., the diameter of the armature must be 76 centimeters.

47. Polyphase Armatures. —Armatures wound two-phase are usually connected in one of two ways. First, the two wind-

ings which are put on the core ninety electrical degrees apart are connected independently each to its pair of rings as shown in Fig. 10.

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This requires four wires for its external circuits. The armature winding may be slightly modified by joining the circuits at their middle points; that is, at the points where they cross over in the figure.

Second, the finishing ends of each set of windings may be joined together, thus requiring but three wires for the external

Fig. 10(b),

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