Hi Nate,

Please find attached the updated Excel file iron_cube3_X+0_Y+0_Z+0_228A.xls.
This file contains both the measurement & predicted data for currents of 144A &
228A. There are 3 charts in the file:
Bz chart for 144A
Bz chart for 228A
Bz chart for 144A & 228A

The predicted ears are slightly more pronounced than the measured ears, so the
twist yoke steel has, in reality, a lower permeability than the BH curve used
for the simulations.

By the way, I believe that it is sensible that the force in the X direction,
resulting from a coil displacement in X, is significantly higher than the force
in the Y direction, resulting from a coil displacement in Y. The reason is as
follows:
a) If there were no steel around the coils, there would be no net force on the
coils, i.e. a net force on the coils (when the coils are off centre) results
from the presence of [unsaturated] steel;
b) The yoke has a significant volume of steel missing immediately above and
below the coils. The missing steel also concentrates flux in the steel around
the cut-out therefore driving the steel at the top and bottom of the yoke
further into saturation.
c) The yoke sides do not have cut-outs and therefore the flux density in the
sides is lower than in the top of the yoke.
The gross effect of the above is that the sides of the yoke have result in
larger forces on the coils than the top and bottom of the yoke.

Best regards,
Mike

Nathan Rodning wrote:

> Hi Mike-
>         Thanks for the figure!  Would you be able to add the data from Glen
> Marshall?
>
> thanks-
>                 nate
> --
>
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> Nathan Rodning
> Professor of Physics, University of Alberta
> **** 2001/02 at TRIUMF:  (604) 222-7549
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