I've been sort of half-heartedly searching around for large-ish, reasonable torque brushless motors of the sort that are used to drive the spindles on variable speed import lathes and mills, like the ones by Weiss. I'd be looking at using them on small spindles of my own, such as a toolpost OD grinder or high-ish speed (8-12krpm) small milling spindles.
I haven't had much luck, partially because I live in the UK (which has lousy supplies of all sorts of things, and those it does have tend to be very expensive) and partially because it seems quite awkward to find brushless motors which aren't a) servos or b) low torque, very high speed RC motors.
Surely someone, somewhere sells 500W-1KW (0.6-1.3HP, ish) brushless motors capable of running at ~5-6krpm? Golden Motor come closest, though they'd need gearing up to bring into a good speed range.
Vector-duty 3-phase induction motors and ebay brushless servos would probably do the same job, but I'm trying to avoid them because the induction motors tend to be quite large for their power output (twice the weight, 50% longer in each dimension) and ebay servos tend to have awkward power requirements (300V+) which are hard to come by in reasonably priced servo drives.