. Practical wireless telegraphy; a complete text book for students of radio communication . d core would occasion great energy losses in this way. An armature coil constructed of thin discs or punchings is said to be laminated. Thefield poles and armatures of both dynamos and motors are laminated to prevent inductionlosses. In the ring wound armature shown in Fig. 31, the armature conductors are wound abouta ring-shaped iron core, separated from one another and equally spaced, the term-inals of each coil, being connected to ad-jacent segments of the commutator. Be-cause the conductors on the o
. Practical wireless telegraphy; a complete text book for students of radio communication . d core would occasion great energy losses in this way. An armature coil constructed of thin discs or punchings is said to be laminated. Thefield poles and armatures of both dynamos and motors are laminated to prevent inductionlosses. In the ring wound armature shown in Fig. 31, the armature conductors are wound abouta ring-shaped iron core, separated from one another and equally spaced, the term-inals of each coil, being connected to ad-jacent segments of the commutator. Be-cause the conductors on the outsidesurface of the core only are active in cut-ting the lines of force, the ring woundarmature is more or less wasteful and isseldom encountered in wirgless telegraphinstallations. 42. Development of ArmatureWindings.—The subject of arma-ture windings is too comprehensiveto be treated in detail here. Thesewindings are exhaustively coveredin many textbooks on dynamo engi-neering which should be referred to for additional details. The drum pj^ 3i_GeneraI OutHne of Ring Wound 32 PRACTICAL WIRELESS TELEGRAPHY. armature windings may be classed into two principal types, the lap winding andthe wave ivinding. The development of the lap winding is shown in Fig. 32, where a number of armaturecoils, numbered 1, 2, 3, 4, 5, etc., successively, are assumed to be memnted on the armatureof a dynamo and to Cut through the magnetic fields of the poles N, S, N, S. The arrowindicates the direction of rotation, and the letters correspond to the segments of the com-mutator. The position of the positive (+) brush of the armature is shown. In this diagram, an armature having 18 conductors revolves in a four pole field and theflow of current will be observed to have the following direction. If we start from com-mutator segment I, the point where the current enters the armature through the negativebrush, then the current flows through conductor 17, to commutator segment A, through con-du
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
