The Practical Management of Dynamos And Motors
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(See " Sparking. ") Apply the remedies with extra care.
4. Cause. Overheated commutator will decompose carbon brush and cover commutator with a black film, which offers resistance and aggravates the heat.
Symptom. Commutator covered with dark coating; commutator brushes and holders show marks of extreme heat.
Dynamos and Remedy. Clean off and polish commutator, reset brushes, start over again, and watch carefully.
5. Cause. Bad connections in brush-holder, cable, etc.
Symptom. Holder, cable, et...c. , feels hottest; unusual resistance found in these parts by " drop method, " p. 92.
Remedy. Improve the connections.
6. Cause. "Arcing" or short-circuit in commutator across mica, or insulation between bars or nuts.
Symptom. Burnt spot between parts; spark appears in the insulation when current is put on.
Remedy. Pick out the charred particles, take com- mutator apart and remedy, or put on new commutator.
7. Cause. Carbon brusJies heated by the current. Carbon brushes require less attention than copper, because they do not cut the commutator, and their resist- ance prevents the development of sparking, but this higher resistance causes them to heat up more than copper brushes.
What to read after The Practical Management of Dynamos And Motors?
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:
(See " Sparking. ") Apply the remedies with extra care.
4. Cause. Overheated commutator will decompose carbon brush and cover commutator with a black film, which offers resistance and aggravates the heat.
Symptom. Commutator covered with dark coating; commutator brushes and holders show marks of extreme heat.
Dynamos and Remedy. Clean off and polish commutator, reset brushes, start over again, and watch carefully.
5. Cause. Bad connections in brush-holder, cable, etc.
Symptom. Holder, cable, et...c. , feels hottest; unusual resistance found in these parts by " drop method, " p. 92.
Remedy. Improve the connections.
6. Cause. "Arcing" or short-circuit in commutator across mica, or insulation between bars or nuts.
Symptom. Burnt spot between parts; spark appears in the insulation when current is put on.
Remedy. Pick out the charred particles, take com- mutator apart and remedy, or put on new commutator.
7. Cause. Carbon brusJies heated by the current. Carbon brushes require less attention than copper, because they do not cut the commutator, and their resist- ance prevents the development of sparking, but this higher resistance causes them to heat up more than copper brushes.
What to read after The Practical Management of Dynamos And Motors?
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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