. Practical wireless telegraphy; a complete text book for students of radio communication . ELECTROMAGNETIC INDUCTION. 31. taken by the armature. A suddenly applied load will tend to slow the armaturedown, and this will reduce the counter E. M. F. of the armature coils; accord-ingly mcreased current will flow through the series winding, which will reducethe counter E. M. F. to a still lower figure, permitting such increase of armaturecurrent as will restore the motor to normal speed. Through use of the differential winding motors may be designed to givevery close speed regulation and are there
. Practical wireless telegraphy; a complete text book for students of radio communication . ELECTROMAGNETIC INDUCTION. 31. taken by the armature. A suddenly applied load will tend to slow the armaturedown, and this will reduce the counter E. M. F. of the armature coils; accord-ingly mcreased current will flow through the series winding, which will reducethe counter E. M. F. to a still lower figure, permitting such increase of armaturecurrent as will restore the motor to normal speed. Through use of the differential winding motors may be designed to givevery close speed regulation and are therefore distinctly suitable to drive the A. for wireless telegraphy. If we keep before us the fact that the counter electromotive force developedin a motor armature acts effectively as a resistance to the flow of current, andthat, this reverse electromotive force increases with the speed, it is easily seenthat a considerable difference must exist between the armature resistance whenstanding still and its effective resistance when in rotation. If such a motorarmature were started by connecting its terminals
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
