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Stepper Motors + Heat / Solutions: Input Plz!

Posted by Janski

Janski

Stepper Motors + Heat / Solutions: Input Plz!
June 27, 2014 08:00PM

Registered: 10 years ago
Posts: 96

Can we speak to Heat and the effect it has on the stepper motors.

Since the Extrusion Method requires a motor and the proximity causes the heat to spread to the motor, what methods do you guys use to control the temperature.

besides bowden extrusion, or liquid cooling. any thoughts?

Pictures / Sketches encouraged! smiling smiley

= Janski

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Janski

Re: Stepper Motors + Heat / Solutions: Input Plz!
June 27, 2014 08:04PM

Registered: 10 years ago
Posts: 96

Main reason i ask is because the Nema 17 motor I am using for a standard MKB extruder and the motor starts skipping in one position without turning. This happens when the heat from the extruder travels up the ceramic block and spreads to the motor.

I have 2 extra 40 mm fans looking to use it directly at the block and the gear / nema 17 plane.

Hope this makes sense smiling smiley

- Janski

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jbernardis

Re: Stepper Motors + Heat / Solutions: Input Plz!
June 27, 2014 09:10PM

Registered: 11 years ago
Posts: 1,320

Are you sure that is the source of the heat? I've never seen that, but I have seen a motor get too hot from an improperly adjusted driver.

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Janski

Re: Stepper Motors + Heat / Solutions: Input Plz!
June 27, 2014 09:16PM

Registered: 10 years ago
Posts: 96

the Heat is generated by the extruder heater block. the extruder fan was not mounted properly and it looks like the stepper motor now broke. when i try to activate it, the motor jiggles back and forth but not turns.

Has anyone fried their stepper motor due to high heat?

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Janski

Re: Stepper Motors + Heat / Solutions: Input Plz!
June 27, 2014 09:22PM

Registered: 10 years ago
Posts: 96

It certainly looks like heat could be the factor.

After checking up on the specs for Nema 17 motors. I found
Temperature Rise: 80°C Max.

the motor was definately above 80C.

Next step switch out the motors and deploy direct fan with heatsinks.

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madmike8

Re: Stepper Motors + Heat / Solutions: Input Plz!
June 27, 2014 11:24PM

Registered: 10 years ago
Posts: 814

I had the same issue with my stepper... Turned out it was one of the steppers connectors had slipped loose from the housing causing a poor connection. Check your connectors...

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Janski

Re: Stepper Motors + Heat / Solutions: Input Plz!
June 28, 2014 05:19PM

Registered: 10 years ago
Posts: 96

Bingo Madmike!

Went through the connections and found a slipped heat shrink that exposed the wires and caused a short.

This taught me that lost COM can be due to bad connection.
Thank you all for the input smiling smiley