. Practical physics. t any instant one single current 298 INDUCED CUKKEXTS flowing arouud the complete circuit iu the manner indicated by thearrows in the diagram. This current reverses direction at the instantat which all the coils pass the midway points between the JV and S number of alternations persecond is equal to the niimber ofpoles multiplied by the number ofrevolutions per second. The fieldmagnets iVand S of such a dynamoare usually excited by a directcurrent from some other 311 represents an alternating-current dynamo with revolvingfield and stationary armature
. Practical physics. t any instant one single current 298 INDUCED CUKKEXTS flowing arouud the complete circuit iu the manner indicated by thearrows in the diagram. This current reverses direction at the instantat which all the coils pass the midway points between the JV and S number of alternations persecond is equal to the niimber ofpoles multiplied by the number ofrevolutions per second. The fieldmagnets iVand S of such a dynamoare usually excited by a directcurrent from some other 311 represents an alternating-current dynamo with revolvingfield and stationary armature con-nected directly to a tandem com-pound engine. Alternators of 5000-kilowatt capacity (nearly 7000horse power) have been built torun at the unusually high speed of 3600 revolutions per minute. Alternators of lower speed but of verymuch greater cajiacity are common (see huge rotor ojiposite ji. 257).355. The principle of the commutator. By the use of a so-called commutator it is possible to transform a current which. Fig. 310. Diagram of alternating-current dynamo
Size: 1707px × 1463px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
