OK so it took us longer than expected to get to this as we have a lot of things going on right now that is taking a lot of intern time. I have attached pictures of the charts for both the 393 and 269 motors. I have also attached the data that generated the charts.
The charts show the relationship between PWM input, Voltage, Current, and Torque at stall.
The thick red line shows the input PWM and Voltage value at stall that the PTCs no longer allowed the motor to stay on for 3 continuous minutes. This is the maximum input voltage I would use during a stall condition.
MC 29 were used for all tests and that is why the curves are so nonlinear. This is consistent with similar tests run by jpearman and others.
I hope you find this data useful.
Paul
VEX motor Stall tests 05-25-2012- Raw Chart Data.txt (7.1 KB)
Motor 269 Stall Chart.pdf (147 KB)
Motor 393 Stall Chart.pdf (149 KB)