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Suppose we have a N-pole electrical machine, then the angular distance between the consecutive poles when expressed in degrees is POLE PITCH.
eg. for a two pole machine (one north and one south pole), the pole pitch is 180 degrees, and for a 4-pole machine: it is 90 degrees.
Note that this is so when expressed in Mechanical degrees, whereas in Electrical degrees it is always 180 degrees.
Therefore:
POLE PITCH (mechanical)=180/(n/2): n=no pf poles.
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