Author Topic: How hot do stepper motors get?  (Read 816 times)

SteveK

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How hot do stepper motors get?
« on: March 25, 2018, 08:11:22 AM »
On my rotary machine I have two motors on the y axis, the axis I use to rotate the work piece. The x axis, which drives the ball screw to move the laser back and forth has one motor. The two rotational motors get warm but the x axis motor gets too hot to touch. Is this normal and/or acceptable? If not, I think I have two options, get a beefier stepper motor or invest in a 3 axis mana se and put two motors on the ball screw as well. I want to keep two motors for the rotation because eventually I'll be turning some larger work. Any thoughts or suggestions or do I just not need to be concerned?

Steve

ggallant571

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Re: How hot do stepper motors get?
« Reply #1 on: March 25, 2018, 11:47:35 AM »
You may want to verify that they have the proper current limiting. On the controller cards are plug in stepper motor driver boards. Typically called A4988 (or something like that I am away). Each has a small adjustment pot. You measure from the case of the pot to ground. I recall the ideal setting for a single motor being around 0.5V and 1.0V for two. You should not rely upon the factory setting as they do not know your motor.

Lacking a multimeter to measure you might be able to slowly turn counter-wise and test until the motor does not turn. Then go a little clock-wise.

There is a write-up on this site plus Google.
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Zax

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Re: How hot do stepper motors get?
« Reply #2 on: March 25, 2018, 12:06:00 PM »
They shouldn't be too hot to touch, I agree the current is probably too high.

SteveK

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Re: How hot do stepper motors get?
« Reply #3 on: March 25, 2018, 12:14:52 PM »
Thanks for the replies, I will check the voltage.

Steve

SteveK

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Re: How hot do stepper motors get?
« Reply #4 on: March 26, 2018, 07:58:58 AM »
Okay, according to my meter the pot is set at .49V, is it possible I'm just working the motor too hard? I can actually touch the motor when it's working but I remove it pretty quickly.

Steve

Zax

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Re: How hot do stepper motors get?
« Reply #5 on: March 26, 2018, 08:40:22 AM »
That's high for a single motor, you should be somewhere around 0.2~0.3V.

SteveK

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Re: How hot do stepper motors get?
« Reply #6 on: March 26, 2018, 09:23:31 AM »
That's high for a single motor, you should be somewhere around 0.2~0.3V.

Okay, I will adjust it, I thought I'd read .5 was about right. While I was at it I checked the y axis and it's .64, should I crank that down a little as well?

Steve

SteveK

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Re: How hot do stepper motors get?
« Reply #7 on: March 26, 2018, 11:26:35 AM »
You guys are pretty amazing!! Turned it down to .25 and it's been running for about an hour and is barely warm to the touch. I'd just assumed it was working too hard and almost didn't even ask. Thanks to  you both once again!!

Steve

Zax

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Re: How hot do stepper motors get?
« Reply #8 on: March 26, 2018, 11:30:58 AM »
0.6~0.7V is OK for 2 motors.

ggallant571

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Re: How hot do stepper motors get?
« Reply #9 on: March 26, 2018, 12:32:20 PM »
I guess for fixture works very efficiently. Must not be Chinese :-\
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