The Management of Electrical Machinery
The Management of Electrical Machinery
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To anticipate slight wear the armature is sometimes adjusted a little nearer the upper poles. Another way to remedy this trouble is to vary the number of turns of wire in the several field-coils until the same flux is produced by each. Of course, this trouble cannot HEATING IN GENERATORS OR MOTORS 131 occur in a bipolar machine, not only because the fluxes are equal for the two poles, as already noted, but also because it is not possible for one path through the armature to have less e. M. F. A...nd act as a short circuit for the other. For the same reason, a multipolar armature with series or two-circuit winding is free from this trouble. This type of winding, however, is not generally used, except for railway motors.
Cause 10. Vibration of the machine.
Symptom. Considerable vibration is felt when the hand or a stick held in the hand is placed upon the machine, and the sparking decreases when the vibration is reduced. Vibration of the brushes, due to a rough or sticky commutator, is hardly sufficient to cause the whole machine to vibrate; nevertheless, reference may be made to "Sparking, " Causes 3 and 4.
What to read after The Management of Electrical Machinery?
You can find similar books in the "Read Also" column, or choose other free books by Francis Bacon Crocker to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
To anticipate slight wear the armature is sometimes adjusted a little nearer the upper poles. Another way to remedy this trouble is to vary the number of turns of wire in the several field-coils until the same flux is produced by each. Of course, this trouble cannot HEATING IN GENERATORS OR MOTORS 131 occur in a bipolar machine, not only because the fluxes are equal for the two poles, as already noted, but also because it is not possible for one path through the armature to have less e. M. F. A...nd act as a short circuit for the other. For the same reason, a multipolar armature with series or two-circuit winding is free from this trouble. This type of winding, however, is not generally used, except for railway motors.
Cause 10. Vibration of the machine.
Symptom. Considerable vibration is felt when the hand or a stick held in the hand is placed upon the machine, and the sparking decreases when the vibration is reduced. Vibration of the brushes, due to a rough or sticky commutator, is hardly sufficient to cause the whole machine to vibrate; nevertheless, reference may be made to "Sparking, " Causes 3 and 4.
What to read after The Management of Electrical Machinery?
You can find similar books in the "Read Also" column, or choose other free books by Francis Bacon Crocker to read onlineMoreLess
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