With no gap the flux density is Br for the magnet ( 1.3T ish). It then falls with the ratio of gap length to magnet length. With gap equal to total magnet length it should be 600mT but will be less due to leakage etc.
If your final gap is smaller than total magnet length you can roughly do it by drawing a line from 1.2T with no gap to .6T at magnet length and assume that you work up and down this line. Just ratio the test gap to required gap.
Flux
Flux[ Parent ]
Distance through the magnet from the North face to the South face.
You can, of course, get magnets which are magnetised lengthwise, with the poles at the end. Useless for an axial flux pma. But it does show that the term "length", which could be taken as a physical dimension, could be confusing. Used in context of the discussion, it refers to the length of the internal magnetic path.
Amanda[ Parent ]
I was thinking in terms of say a 1x2 magnet with 2 being the length.
I'm o.k now i think :)
Mark [ Parent ]
