Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 169
somewhat different in the armature windings. CHAPTER XI DIRECT-CURRENT MACHINERY CONSTRUCTION Types of Armatures.—Direct-current armatures may beclassed under two general types—^^ring and drum. Bothtypes get their names from the shape of the core. The coreof the ring type consists of an iron ring… … Fig. 157.—Ring arniaturo in section. shows three coils in place and how the coils fall over oneanother to form a complete winding, as in Fig. 159. In thedrum-type armature the spread of the coils—tiiat is, thenvunber of slots spanned by a coil—is determined by thenund)er of poles. For example, in…
Electric machinery
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