I am designing a small metal lathe for home use, and I am having trouble sourcing a motor for it. Disclaimer: I am aware that such lathes are available for purchase, and anything home-built will be nowhere close to the quality and repeatability of commercially available ones. It is being made for fun and education purposes.
The requirements for the motor are:
I will be running the lathe in my apartment, so the motor must be as quiet as possible. Brushed motors are out of the question. Brushless (three phase) would be my first choice.
It must be compact in diameter. The motor will be housed inside the lathe, and I can fit a motor only as large as 60mm in diameter and 90mm in length.
It must be powerful enough. I am hoping to get something close to 1 HP (750W). 500W is probably bare minimum.
I will be designing reduction gearing, so RPM doesn't matter much, but I'd prefer somewhere around 1000 RPM to make things easier. Definitely no more than 4000 RPM.
It must be able to run for a prolonged time without overheating.
I am located in Lithuania, and the local parts supply is really scarce over here. I do most of my hardware/electronics purchasing from Aliexpress/Ebay.
There are plenty of BLDC motors on Ali that fit the size and power requirements, such as this one, or a much more powerful this one, but while they are incredibly powerful for their size, I seriously doubt they would hold for long before overheating in full enclosure, since they seem to be made for quadcopters. I could add a cooling fan, but that would cause way too much noise.
I have considered reusing a motor from a scooter (like Segway), since these motors are powerful and designed to run in full enclosure. Problem is, I can't find one that is small enough, and their stator is typically in the axis (and the wires run through the inside of that axis), which would make it very difficult to adapt for a lathe.
Perhaps I should be looking for a more traditional three-phase motor (perhaps with VFD controller), but I can find nothing of sufficient power that would fit into the frame of my design.
I have been searching for 3 days now, but the difficulty comes from the fact that sellers and manufacturers of these generic motors rarely provide info on the overheating characteristics of their motors. Which is why I'm posting here, hoping that maybe someone could suggest something from experience. Specific models of motors would be best if you happen to know what fits these requirements, but even general comments on the types and characteristics I should be looking for would be very helpful.