. Practical wireless telegraphy; a complete text book for students of radio communication . ifferential Field Winding.—As we have explained, thespeed of a motor is increased or decreased by regulation of the strength of themagnetic field and any reduction of field flux of a given machine will increasethe speed of the armature. By the use of the differential field winding shown, inFig. 29, the flux of the shunt field is automatically weakened in accordance withthe external load and the speed therefore self-regulated. Confining our visionstrictly to the windings of the field poles, two distinct
. Practical wireless telegraphy; a complete text book for students of radio communication . ifferential Field Winding.—As we have explained, thespeed of a motor is increased or decreased by regulation of the strength of themagnetic field and any reduction of field flux of a given machine will increasethe speed of the armature. By the use of the differential field winding shown, inFig. 29, the flux of the shunt field is automatically weakened in accordance withthe external load and the speed therefore self-regulated. Confining our visionstrictly to the windings of the field poles, two distinct set of coils will be seen,one a series winding (SR) in series with the armature and the other a shuntwinding (SH) connected across the main power line. If the current in thesetwo windings circulates in opposite directions, a diflferential field is producedand the resultant field will be of greater or less intensity according to the current *The term torque is applied to the twisting force produced in the armature when the currentis turned on. Torque is the result of pull and ELECTROMAGNETIC INDUCTION. 31
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
