ARTV, As the north pole of the magnet approaches the coil the wave form will go up on the positive side. When the coil is directly above the north pole, the wave will peak out. As it moves away from the north pole, the wave form will go down (that's half of a cycle). Then at exactly half way between the north pole and the approaching south pole the wave form will be at the zero or starting point. Then as the south pole approaches the wave will go negative. When the coil is directly over the south pole it will reach the bottom of the wave form and turn upward. Once again at the midpoint between the south pole that just passed and the next north pole approaching, it will be at the zero position. That's one complete cycle, passing both north and then south poles. And do it all over again for every set of poles per revolution.
Bridge rectifiers use diodes to take the bottom half of the wave form and mirror it to the opposite side of the neutral line, so instead of electrons going backward, they flow only in one direction. A diode is like a check valve in a water system, permitting flow in only one direction. Google bridge rectifiers. In single phase, the wave form returns to the neutral line as it passes each magnet and reaches the midpoint to the next and opposite pole. This gives a rough but workable flow of electrons in only one direction (dc). The wave looks like a series of bumps, but all in the positive direction.
Three phase has that same series of bumps but they are offset 120 degree. That gives a top of the waveform that has three bumps, but never returns to the zero line. It eliminates the pulsing of going from peak to neutral or from full speed to a full stop in flow terms.
I want to point out that when the direction of flow changes as in alternating current, one needs laminations to control heat from the change in direction of electron flow, but with DC, the electrons always flow in one direction and do not re-orient polarity (180 degree), thus laminations are not a necessity. In my case, combining electromagnets and permanent magnets, the flow is dc so laminations are not a requirement and I'm using regular old cold rolled steel. Google electro-permanent magnets for more info. Of course the power coils will be seeing ac so that does require laminations to limit hysteresis derived heat.
Perhaps this explanation makes some sense to you.
Best regards, Toby