I am not sure what you are asking for. Dead center of the roughly rectangular reagion of the not-a-coil (lets call it the hole from now on please?) will always be a radial field in the X-cusp and a null field in the Funny cusp. The distinction is the X-cusp has no metal in the way, unlike the Funny cusp and the current WB6&7.hanelyp wrote:KitemanSA, could you adjust your calculations to get field strength and direction exactly on the lines dividing the square "not a coil" in half? And especially dead center of the face? As I expected, the field close to the center is looking pretty weak in your plot. Calculation of the same plane for WB-6/7 style kissing coils would also be of interest.
Could you post your spreadsheet someplace for us to experiment with?
The plot I showed does not include the radial portion of the field. I am still figuring which way is best to present that. Remember, I have to seperately plot each point on a visio sketch to present anything. It is tedious!
The X-Cusp is an odd sort of combination between the funny and the line cusp. If you follow the pure polyhedral magnet lines in, there is a null at the center of all the coils, so there is a null at the center of the vertex also. With the X-cusp, there virtual coils that kind of split the difference between the two real legs and connect to the vertical symmetry line about half way out each span from the horizontal symmetry line. Inside the hole, the field at the mid-plane of the coils switches from outward at the horizontal symmetry line to inward about half way up, and back to outward outside the hole. But that whole hole mess is covered pretty well by the tangential field inside the MaGrid, except at the very center, which is a radial field like a line cusp, but the X-cusp has no metal in the way.
I am willing to have my spreadsheet posted. How?