Originally Posted by
RMC
Hi Eric,
If you have access to a local public library I suggest you check with them if they have a copy of John Eargle's Loudspeaker Handbook, which you can look at or maybe even borrow.
There's a chapter called "Principles of Magnetics" with what you need to know, and more, about speaker magnets: how design engineers conceive them, what they look for or try to avoid, the properties and good/bad of each type, Alnico vs ferrite vs neo, etc.
Eargle follows and outlines the steps, starting with basics then adding things on the way, as he often does to explain a matter, leading to a more complete design (i.e. progressively putting the elements together).
There's a somewhat similar graph to the one posted in previous post, as well as others for magnets, and that one is called the Hysteresis curve.
Can't guarantee you'll understand all that stuff, I haven't, but a good part can be digested and the lessons to remember are pretty clear. Regards,
Richard