The book The Practical Management of Dynamos And Motors was written by author Francis Bacon Crocker Here you can read free online of The Practical Management of Dynamos And Motors book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Practical Management of Dynamos And Motors a good or bad book?
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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.
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