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 I would still need to calculate the current before going any further
your V/Ω would be upper bound.

Be aware you'll get somewhat less because the current in your armature tends to oppose the flux from your magnet.

I dont know how to calculate that. But this link suggests that these rare earth magnets' equivalent amp-turns per meter is quite substantial, well in the tens of thousands... with just 36 turns and modest current my intuition says you'll be okay.. but it is a guess.

http://www.kjmagnetics.com/specs.asp

in fact it's an interesting site, nice glossary and tables.....

http://www.kjmagnetics.com/

you know to keep air gap as small as possible and have a complete magnetic circuit.