How to measure force on linear system?

["Davis, Richard W (WNS)" <richard.w.davis@xxxxxxxxx>]

Title: How to measure force on linear system?

I'm looking at eddy current brakes--linearkind, not rotating.

I'm looking for all the guidance folks canprovide, but here are two specific questions...

• I'm using arrays of magnets (wigglersor undulators).  What's the recommended method to define a circuit, given that what I have is a large number of interacting circuits?  (Basically the same problem as a linear motor.)
• Is there a way to get FEMM to tell me thelinear force (assume the magnets are moving past the stator or conductive plate).  I know the relative velocity of magnet and conductor, and I know the period (wavelength) of the magnetic circuits, so the equivalent frequency is easily calculated.  It ranges from 0 to about 60 Hz.  (P.S.  I think I can guess what the force is at zero Hz.)  

Richard W. Davis
WNS Network Services and New Capabilities
Office  425 580 8860
Mobile  206 890 4328