Poles Arrangement in Multipole Generator

[QwertyXP]

In multipole generators, why do the poles facing each other have the same polarity? Wouldn't this give rise to a zero net current?

Consider this link:

http://electriciantraining.tpub.com/14177/css/14177_40.htm

Initially, it gives the example of a simple generator with opposite poles. However, when it comes to the multipole generator, no explanation is given as to why such an arrangement is used.

 

[Averagesupernova]

Draw the flux lines, then it might make more sense to you.

 

[QwertyXP]

I had thought about the flux lines as well. However, since the armature winding is very close to the poles, shouldn't the flux lines at that distance simply be straight lines perpendicular to the face of the pole?