Shop And Road Testing of Dynamos And Motors, a Practical Manual for the Testing Floor, the Car Barn, And the Road
Shop And Road Testing of Dynamos And Motors, a Practical Manual for the Testing Floor, the Car Barn, And the Road
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is increased enough the machine will drop its field entirely. We may say then, that on a shunt machine a given change in the rheostat has a greater effect than on a separately excited machine.
294 TESTING OF DYNAMOS AND MOTORS.
The presence of the rheostat is sometimes referred to as objectionable, in that it introduces an additional /V loss into the equation for efficiency. While this is in a certain sense true, it can only be avoided by winding the fields with an unheard-of metal whose resist...ance is the same for all temperatures, and doing away with all arma- ture drop. If the former could be done there would remain the variation of E. M. F. due to variation of load, and could the latter difficulty be overcome there would still be a great difference between the voltages for hot and cold fields. It must be remembered that for a specified voltage at the terminals there must be a specified current in the field circuit, which must therefore be of a specified resistance. The ampere-turns necessary to maintain the proper potential for any given load is independent of temperature as far as concerns the windings of the field, and depends only upon speed («), the number of armature conductors (C), and the goodness of the magnetic circuit But, as we have seen, the temperature influences the ampere-turns indirectly by raising the armature resist- ance, and increasing its /V loss.
What to read after Shop And Road Testing of Dynamos And Motors, a Practical Manual for the Testing Floor, the Car Barn, And the Road?
You can find similar books in the "Read Also" column, or choose other free books by Eugene Chilton Parham to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
is increased enough the machine will drop its field entirely. We may say then, that on a shunt machine a given change in the rheostat has a greater effect than on a separately excited machine.
294 TESTING OF DYNAMOS AND MOTORS.
The presence of the rheostat is sometimes referred to as objectionable, in that it introduces an additional /V loss into the equation for efficiency. While this is in a certain sense true, it can only be avoided by winding the fields with an unheard-of metal whose resist...ance is the same for all temperatures, and doing away with all arma- ture drop. If the former could be done there would remain the variation of E. M. F. due to variation of load, and could the latter difficulty be overcome there would still be a great difference between the voltages for hot and cold fields. It must be remembered that for a specified voltage at the terminals there must be a specified current in the field circuit, which must therefore be of a specified resistance. The ampere-turns necessary to maintain the proper potential for any given load is independent of temperature as far as concerns the windings of the field, and depends only upon speed («), the number of armature conductors (C), and the goodness of the magnetic circuit But, as we have seen, the temperature influences the ampere-turns indirectly by raising the armature resist- ance, and increasing its /V loss.
What to read after Shop And Road Testing of Dynamos And Motors, a Practical Manual for the Testing Floor, the Car Barn, And the Road?
You can find similar books in the "Read Also" column, or choose other free books by Eugene Chilton Parham to read onlineMoreLess
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