. An elementary manual of radiotelegraphy and radiotelephony for students and operators . rotor current. Hence both of these cut throughthe rotating coils and produce currents having respectively thefundamental frequency and three times that frequency. Let ussuppose, then, that both the field magnet coils or so-called statorcoils, and also the rotating armature or rotor coils, are closed bycircuits consisting of an inductance coil of very low resistance inseries with a condenser (see Fig. 6). This inductance (L) andcapacity (C) can be adjusted or tuned to a frequency n or an angular velocity ^
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . rotor current. Hence both of these cut throughthe rotating coils and produce currents having respectively thefundamental frequency and three times that frequency. Let ussuppose, then, that both the field magnet coils or so-called statorcoils, and also the rotating armature or rotor coils, are closed bycircuits consisting of an inductance coil of very low resistance inseries with a condenser (see Fig. 6). This inductance (L) andcapacity (C) can be adjusted or tuned to a frequency n or an angular velocity ^ = li^n by the rule that f = -—. Let us suppose that the angular velocity of the armature orrotor coil is p, and that the inductive-capacity circuit completing it is tuned for a frequency n = —. Also let the stator coil be short-circuited or completed by an inductive-capacity circuittuned to a frequency 2n, and let the rotor coil have also asecond inductive-capacity circuit tuned to a frequency Sn (seeFig. 6). We have then provided external circuits in which the 88 RADIOTELEGRAPHY. alternating currents can flow which are circulating iu the rotorand stator coils. The above description gives an outline of the operation of the Goldschniidt alternator for the pro-duction of high frequency will be seen that this machinemultiplies the frequency of an alter-nating current. The actual alter-nator consists of a fixed portioncalled the stator, which consists ofa number of coils fixed on laminatediron pole-pieces attached to a frame,and these coils are traversed by acontinuous current which providesan exciting magnetic field (seeFig. 7). In the interior of this field-magnet frame a laminated slottediron core revolves, iu the slots ofwhich is wound a zigzag windingconnected at the ends to a pair ofslip rings on the shaft, so tbat con-nection may be made with thecondenser-inductive circuits rotor is made to revolve at ahigh speed, and generates in thesecoils an a
Size: 1258px × 1987px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
