Assume this is the General Magnetics forum for a minute. I have the rotor out of a gizmo made out of alnico. It looks like a + and the poles are NSNS around. If it was 2 bar magnets I guess it would be NNSS? There is a hole in the center for a shaft. So it is really like 4 bar magnets in a diamond shape, right? I'm sitting here with a file and a piece of something magnetic and some filings on a piece of paper trying to see the field pattern, but its just a clump. Its part of a 'brushless tachometer'. Anyone ever heard of one of those?