The diameter is 182mm (7.2 inches), and the width is roughly 124mm (4.9 inches), stock shaft is 20mm dia. The website rates them for 48V-96V. $288 for air-cooling, and $308 for liquid cooling. The brushless controllers that are designed to go with this motor are sine-wave, and $260-$295. One spec list has it at 3,000-5,000 RPMs when used with 48V-72V, so the kV is approximately 62-69 RPMs per volt?
Luke's famous deathbike used the larger Golden Motor Axial-Flux 10kW motor at one time (he has moved up to several more powerful motors now) , and I suspect this smaller version of that motor has a similar internal construction. For those who have been concerned that air-cooling allows dust to be blown into bearings, this stator is firmly attached to an aluminum side-plate, and the external fan only blows air across the outside of the sideplate...not a bad way to go.
Here's a build: https://endless-sphere.com/forums/viewtopic.php?f=12&t=82158#p1219370
http://www.goldenmotor.com/
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These pics below are the larger HPM 5-kW, from 2012
http://endless-sphere.com/forums/viewtopic.php?f=30&t=46453
Luke's famous deathbike used the larger Golden Motor Axial-Flux 10kW motor at one time (he has moved up to several more powerful motors now) , and I suspect this smaller version of that motor has a similar internal construction. For those who have been concerned that air-cooling allows dust to be blown into bearings, this stator is firmly attached to an aluminum side-plate, and the external fan only blows air across the outside of the sideplate...not a bad way to go.
Here's a build: https://endless-sphere.com/forums/viewtopic.php?f=12&t=82158#p1219370
http://www.goldenmotor.com/
__________________________________________________
These pics below are the larger HPM 5-kW, from 2012
http://endless-sphere.com/forums/viewtopic.php?f=30&t=46453