I've got a few Keling KL23H276-30-8B motors on a Taig mill. I'm using Gecko 203Vs and a Keling KL-600-48 (48v power supply turned down to 40v) to drive them. Everything it working beautifully.
I'm concerned that my motors may be getting a little on the hot side though. They haven't got too hot to touch with my hand (and I have a low heat tolerance) but I also haven't run them for very long. Is there some point at which I should give the motors a break?
I've turned the voltage down to 40v on my power supply, which helped. I've been thinking about adding some passive cooling (I've got a bunch of heatsinks lying around). I've even thought about wrapping some copper tubing around the outside of the motors and pumping water through them. Would some kind of cooling be a good idea?