I have spent a lot of time on the phone with Astro lately regarding the 3200 series motors. We discussed the following;
Larger OD bearings for 3220s to support a 1/2 inch shaft better than the 7/8 OD bearings they have been using. Over the coming months all 3220s will move to that design.
Higher temp epoxy. They are looking into that right now and plan on implementing this soon.
Fan cooling. They are making me a prototype 3220 with a perforated can front plate and rear plate with a one inch long shaft protruding out the end of the can. I will be machining a squirel cage fan to mount to the rear shaft. This will pull air through the motor. My DaVinci drive cools the outside of the can. The fan will pull air directly through the windings for even better cooling from inside and out. I have had this idea for a long time, but never implemented it because all previous drive designs blocked the front of the motor. This blocked air from exiting (or entering) the front of the can. However, the DaVinci drive eliminates this problem by leaving the front of the motor completely unobstructed. Now the motor can be drilled for through can cooling.
We are working together, at this point, to spec 3200 series motors to MY personal requirements (at least for the motors I order from them).
They are VERY interested in working with me to make what I want.
1% of the world's population can think "Outside the box". The rest are firmly stuck within the box. Where are you?