Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 217
the main circuit, attracts anarmature whose movement toward the magnet is opposedby the action of a spring which is susceptible of adjust-ment. When the current has too high a value, the electro- GENERATORS. 205 magnet attracts its armature more strongly than ordinarily.The latter moves toward the… … Fig. 125. to bring the current to its normal value. If the current betoo weak, the spring which is attached to the electro-magnetarmature overpowers the magnetic attraction. The result-ing movement of the armature stops the rotation of thescrew and permits the rotation of the nut. This results ina…
Electric machinery
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