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The calculated RE figure includes the contribution of eddy current losses (e.g. in ac-shorting devices) outside the air gap, it is not just the DC resistance.

Odd to see the Q for leakage loss negative though, and the simulated impedance fit doesn't look very good above 1 kHz. How is the driver supported for the free measurement?
 

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Discussion Starter · #3 ·
I had it sitting on top of my workbench, on two 3/4" MDF blocks so the pole vent wasn't blocked, and a pair of clamps lightly snugged down from the edge of the frame to the bench to hold it in place. It seemed reasonably secure.

Thanks for your help.
 
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