. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 67c—Details of % K. W. 500 Cycle Crocker Wheeler Motor Generator. current at pressures varying between 120 and 380 volts with current output of At normal saturation the generator and the motor fields require about 29X110 2j4 amperes each. The complete motor, therefore, is rated at = 746horsepower. Fig. 67a shows the gen-erator and motor field wind-ings, the end plates and theoil gauge of the 2 500cycle motor generator. Themachine completely assem-bled but with the rotarydisc d
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 67c—Details of % K. W. 500 Cycle Crocker Wheeler Motor Generator. current at pressures varying between 120 and 380 volts with current output of At normal saturation the generator and the motor fields require about 29X110 2j4 amperes each. The complete motor, therefore, is rated at = 746horsepower. Fig. 67a shows the gen-erator and motor field wind-ings, the end plates and theoil gauge of the 2 500cycle motor generator. Themachine completely assem-bled but with the rotarydisc discharger removed isshown in Fig. 67b. Details of the >4 K. cycle Crocker Wheelermotor generator are shownin Fig. 67c and the assem-bled machine in Fig. is to be noted that therotor of the generator iscomposed of two tootheddiscs without windings and. Fig. 67d—Vi K. W. Motor Generator Assembled, MOTOR GENERATORS. 57 that both the field and armature windings are stationary. The rotor doses andopens the magnetic circuit between the armature and field windings and therebyinduces current in the armature. 53. Field Rheostats.—A type of field rheostat supplied with motor gen-erators is shown in Fig. 68. A coil of composition resistance wire baked in a heatproof insulating cement ismounted in a metal case. Thewire is tapped at intervals and con-nected to brass studs over which asliding contact arm moves. An-other type used by the MarconiCompany has a number of turns ofbare resistance wire wound on aslate base. A sliding contact mov-ing over the turns permits veryclose regulation of the flow of cur-rent in the field winding. A rheo-stat of this type is essential formotor generators used withquenched spark transmitters whichrequire extremely close regulationof the generator voltage. 54. Dynamotor and RotaryConverter.—The dynamotor and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
