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heating up motors till they fail is no fluke. It happens fairly often, often during testing.
The motors can handle 40 amps no problem.
They can't handle stall current (well above 100 amps) for long. The problem is that the 40 amp breakers are thermal, and as such do not trip at 40 amps. They trip if you stay above 40 amps. How long that takes depends on how much current you are pulling. With the high currents the new motors are capable of pulling, the breakers should trip fairly quickly at stall.
However, testing a robot means running it for long periods of time. While the breakers may have time to cool in between stalling, the motors will stay much hotter much longer.
When testing, take breaks to let the motors cool.
-Andy A.
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