Modification of a commutator motor and its operation as a repulsion motor . .2. The s\im of all these E. !\s will, therefore, be zero since for each coil under anN pole there is a coil in the same series correspondingly-placed rnidex an S pole. Hie ciirrent which woiild flow ina wire Joining tlie two brushes would then be zero. There-fore this is the position where E the transformer E. M. between brushes, is zero. On the other hand, if we consider the generatorE. M. i3. ( sho-wn in red on the diagram) we find a dif-ferent condition. Coil is cutting no flixx and con-sequently
Modification of a commutator motor and its operation as a repulsion motor . .2. The s\im of all these E. !\s will, therefore, be zero since for each coil under anN pole there is a coil in the same series correspondingly-placed rnidex an S pole. Hie ciirrent which woiild flow ina wire Joining tlie two brushes would then be zero. There-fore this is the position where E the transformer E. M. between brushes, is zero. On the other hand, if we consider the generatorE. M. i3. ( sho-wn in red on the diagram) we find a dif-ferent condition. Coil is cutting no flixx and con-sequently has no E. M. P. generated in it. Coil iscutting flux from both B and S and the E. M. P. is in thedirection shown. Coil is also under conditionssimilar to coil so its E. M. is added to that Coil is also added to 2 and 3. Coil I Ii i i i I cuts on flux aiid lias no E. M. F, generated in it. Tliisposition of tlie bruslxes tlien gives tlie maxirnuii^. generatoraction, in fact, it is tlie normal position for tlie brusliesof a D, C. Going now to Fig,5 we iiave siiown tne state of af-fairs witli the bruslies sliifted 90 electrical degrees fromtlie position in diagram no, 4. In tliis diagrari t]ie con-ditions are, therefore, just reversed from those of ,That is the s^Jirx of the E. M, Ps, in coils duo to trans-former action is a msiximun, and the sum of the ,generated by rotation is r^ero, Ihese conclusions areshown by a study of the flux action the same as this case , however, the coil wjiich is short-circuitedby the brush encloses as much H flux as it does 3 flux sothat the transformer E, M, F. induced in it is zero smd 21. no current -will flow in it on accoimt of tliis torque produced by tiiis large sliort-circuit currentin tlie otlier case will tlien be lacking in tliis position. Witli tiie bruslies on a point slxown in Fig,4, wMcliis marked zero degrees^ we liave tlie maximum generatoraction and zero tran
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