Diametral Magnetization
Example file: diametral_magn.fem
In many machines with arcshaped
magnets, it is sufficient to simply define the magnetization
direction to be constant. However, for arcs that cover a large angle, there can be a
significant
difference between a constant magnetization direction (i.e. "diametrial magnetization")
or a
magnetization direction that varies so that the magnetization is always pointed directly
across
the air gap (i.e. "radial magnetization"). Figure 1 shows a machine with permanent
magnets
that cover an 80o arc. In this example, a constant magnetization direction is defined for
each
magnet. At the edges of the magnet, the constant magnetization direction results in
magnetization that is nearly diagonal with respect to the gap. Depending on how the
magnets
are manufactured, this may be a true or erroneous representation of the fieldthe
magnets
need to be modeled as magnetize