Servo motor overheating

[Azalin]

can be used in the 500 r/min to 1200 r/min of high-speed spindle

High speed in 500-1200 RPM range. This must be a joke.

[lt00273]

Need Help

I have a DMM AC Servo Motor running the Z Axis for a Knee Mill, load is heavy but the motor seems to handle it ok,
Lately the Drive and Motor are getting hot after several minutes of operation, I sent the driver back but not the problem.
Any suggestions?

[rcheli]

I tried a ceramic bearing in a OS 60 R/C Heli engine. They are supposed to be good in high heat applications. But the ceramic balls pitted and they were no better than standard bearings in that application.