On Jul 10, 2024, at 5:44?PM, BuffaloJohn via groups.io <johndurbetaki@...> wrote:
See responses below
If remember NEMA ia at sea leave I think at 40% humidity.
No, there is NO humidity, it is 40C which is 104F.
We feel humidity as making the heat worse because our bodies are cooled by evaporation. ?humidity slows down the evaporation process. ?But this does not apply to motors.
The more modern way to use a motor is to embed a tempature sensor into it and have the controller reduce the power so as not to overheat the motor. ? But years ago sensors and the computer needed would cost more than the motor. ?But today it costs almost nothing so “temperature throttling" is common. ?I think our minilathes are too old of a design for this. ?Maybe the ones with BLDC motors have this?
In any case this whole problem of brushes goes away with brushless motors. ? The other thing about those motors is they have maximum torque at zero RPM. ? If you must replace a motor, that is the way to go.
