Dynamo Electric Machinery Its Construction Design And Operation Direct Curre
Dynamo Electric Machinery Its Construction Design And Operation Direct Curre
Samuel Sheldon
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other machines in completing the magnetic circuit. The magnets are mounted on a frame, including legs and bear- ing supports for the armature shaft. The armatures of the older machines of this type are spheroidal in shape, while the more recent ones have ring Fig. 122. armatures ; these are more readily repaired or rewound. The winding of either form of armature is peculiar in that only three coils are employed, set with an angular displace- ment from one another of 120 degrees. The inner ends ...of the three coils are joined to each other, and are not at- tached to any other conductor, an arrangement unique in 202 DYNAMO ELECTRIC MACHINERY. direct-current dynamos. The outside ends are connected to the segments of a three-bar commutator, from which the current is collected by four copper brushes connected in multiple. Regulation is obtained by shifting the brushes in the following manner. Fig. 123 shows the two possible rela- tions between brushes and commutator that may exist at any instant.
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