Mechanical angle, electrical angle, and Park transformation
What is key is the electrical frame of reference. Every pole-pair the cycle completes.

For a 6 pole machine, 3pole-pair, this wrap (in the mechanical frame of reference) is every 120degrees

For an 8 pole machine, 4pole-pair, this wrap (in the mechanical frame of reference) is every 90degrees. 

If you unwrap a machine stator (see below for a 2pole-pair) the difference becomes clear