Alternating Currents of Electricity Their Generation Measurement Distribution
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The only position when the motor will not start is when the armature is placed so that the brush on each side touches both commutator segments at once. To start the motor from this position, it is of course necessary to 138 ALTERNATING CURRENTS OF ELECTRICITY. Slightly shift the brushes to one side or the other of the dead centre. From what I have said in Chapter I. , you will easily see that this kind of FIG. 34. Motor will also start and work with an alternating current, but its power will at... first be very slight. Observe now what happens when the alternating current is switched on whilst there is no load on the motor. It will start and gather speed as all series wound motors do. If the current were con- tinuous, the motor would very soon begin to race, but with an alternating current this cannot happen, because in trying to get up a racing pace the arma- ture must pass through that speed which corre- sponds to the frequency of the supply current. At SELF-STARTING MOTORS. 139 the moment when this happens, the reversal of cur- rent produced by the commutator coincides exactly with the reversal of the supply current, and the re- sult is that the current flowing through the arma- ture does not any more change its direction.
What to read after Alternating Currents of Electricity Their Generation Measurement Distribution?
You can find similar books in the "Read Also" column, or choose other free books by Kapp, Gisbert, 1852-1922 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The only position when the motor will not start is when the armature is placed so that the brush on each side touches both commutator segments at once. To start the motor from this position, it is of course necessary to 138 ALTERNATING CURRENTS OF ELECTRICITY. Slightly shift the brushes to one side or the other of the dead centre. From what I have said in Chapter I. , you will easily see that this kind of FIG. 34. Motor will also start and work with an alternating current, but its power will at... first be very slight. Observe now what happens when the alternating current is switched on whilst there is no load on the motor. It will start and gather speed as all series wound motors do. If the current were con- tinuous, the motor would very soon begin to race, but with an alternating current this cannot happen, because in trying to get up a racing pace the arma- ture must pass through that speed which corre- sponds to the frequency of the supply current. At SELF-STARTING MOTORS. 139 the moment when this happens, the reversal of cur- rent produced by the commutator coincides exactly with the reversal of the supply current, and the re- sult is that the current flowing through the arma- ture does not any more change its direction.
What to read after Alternating Currents of Electricity Their Generation Measurement Distribution?
You can find similar books in the "Read Also" column, or choose other free books by Kapp, Gisbert, 1852-1922 to read onlineMoreLess
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