[Al Skierkiewicz]

Richard,
The Denso motors are not open frame and so some of the techniques mentioned above to cool down the motor will not work very well. The thermal cutout is not part of the outside frame of the motor so anything done to the outside case will do little to the inside. A picture will help, but my guess is that your mechanism is producing significant loading for this motor. If you are like most, pulling on a chain and turning to large modules is really at the outside limit of this motor. You can see that the Globe works well in this application. We have used Globes on our crab drive for many years now. If your crab modules do not have a bearing surface at the bottom of the module, then friction at the top bearing can be pretty high, especially when the robot is moving.