New SEAS Excel motor, any details?

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#3
My suspicion is a full copper sleeve:

Hint:
SEAS datasheet:
“precisely fitted copper parts for excellent linearity”

Vs old W18EX001
“Heavy copper rings mounted above and below the T-shaped pole piece”
 
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#5
Sleeve may well be the case. A less conductive former will make not difference in inductance and little difference in distortion as the eddy current braking action is pretty linear. You need a little lower current for the same output which in second order may improve distortion.
 
#6
It may not in itself, but it does (or can) impact other areas of construction, so there remains a potential influence there, even though it's not necessarily direct. Without knowing the full details of the motor design there's no way of knowing how all of the components / proportions / shaping are affecting behaviour. It does look like one of Seas's best recent efforts. Not that I've come across a bad motor from them in the last 20 years or so. Maybe not always state of the art, but usually well-thought out & implemented.
 
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