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Nema 17 operating at 60°C - still ok?

Posted by Persephone 
Nema 17 operating at 60°C - still ok?
August 06, 2016 02:34PM
Hey everyone,

I`m currently using a direct drive bowden extruder with a NEMA 17 Motor (SM42HT38-1684AF) and DRV8825 stepper drivers. My whole printer is running in an enclosure, which heats up to about 40°C (necessary for larger ABS prints).

The temperature of the extruder motors chassis rises up to around 60°C, measured with an IR thermometer. Is this a tolerable temperature or am I risking long term damage of the stepper motor? I already attached a 40mm fan and turned the stepper drivers current just high enough, so the extruder won't miss any steps.

I read that the inside temperature of the stepper motor is about 30°C higher than the chassis temperature (so ~90°C at the inside in my case) and this particular motor can take a temperature rise of 80°C at an ambient temperature of up to 50°C. Does that mean the motor can handle up to 130°C and I'm still 40°C away before damaging the motor?

Edited 1 time(s). Last edit at 08/06/2016 02:36PM by Persephone.
Re: Nema 17 operating at 60°C - still ok?
August 29, 2016 04:46PM
I believe from spec-sheets I found that to be ok, but definitely not ideal. You should look up spec sheets yourself to verify though. Personally I'd cool that for sure!
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