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Author Topic: Wrong NEMA-17 motor?
krummrey
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Posts: 66
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Post Wrong NEMA-17 motor?
on: October 16, 2015, 10:01
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Hi,
I have the following motors:

Part No.: 17HS4401N
Step Angle: 1.8 degree
Voltage: 3.4 V
Current: 1.7 A/phase
Resistance: 2.0 Ohm/phase

The motor shield gets extremely hot and stalls after a while. I guess the motors draw too much power for the shield. Is that the case?
If so, what would be best for me - get new motors or a different driver shield? Love to hear your suggestions

The one from Ada Fruit?

sandy
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sandy
Post Re: Wrong NEMA-17 motor?
on: October 16, 2015, 22:01
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You're probably right about the diagnosis - the motors pulling too much power through the drivers. Without knowing which driver shield you're using, I can't really suggest a option. Some motor drivers (like the Polarshield) are adjustable, so you can modify the power, but others have to have the motors matched to them. Either get a new shield, or new motors - doesn't make much difference which!

sn
reconlap
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Posts: 7
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Post Re: Wrong NEMA-17 motor?
on: October 18, 2015, 14:42
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Hi krummrey,
Think you need to set the v-ref on the pot on you stepper driver.

you may find this link helpful
http://reprap.org/wiki/Pololu_stepper_driver_board

Regards
krummrey
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Post Re: Wrong NEMA-17 motor?
on: October 22, 2015, 10:10
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I just bought two Adafruit 350ma motors. They seem to work well with the V1 motor shield. Thanks for your thoughts
sandy
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sandy
Post Re: Wrong NEMA-17 motor?
on: October 22, 2015, 21:34
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Excellent Krummrey, good luck with the project!

sn
krummrey
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Post Re: Wrong NEMA-17 motor?
on: October 24, 2015, 20:07
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Today I got it to draw today!

ImagePolargraph - First Test
A few things need to be ironed out. The square isn't straight yet and the gondola needs some more love. But it draws. Thanks Sandy for your great project and your continued support
sandy
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sandy
Post Re: Wrong NEMA-17 motor?
on: October 24, 2015, 20:18
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Good work!
DaniK
Beginner
Posts: 34
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DaniK
Post Re: Wrong NEMA-17 motor?
on: May 21, 2016, 11:08
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Hey guys,

I happen to have a second polarshield and a couple of these stepper motors lying around:
http://www.zappautomation.co.uk/sy42sth47-1684a-high-torque-hybrid-stepper-motors.html with a "rated current" of 1.68 A)

after some reading in the forum I figured out that I shouldn't use the stepper drivers the polarshield comes with and got 2 Black Edition Polulus with the cooling element:
https://www.pololu.com/product/2128

anyone any idea if I can simply swap them and run it normally? Or do I need to adjust anything. Is there any danger that I break the whole polarshield(arduino) or is the worst that can happen burnt through stepper drivers?

thanks in advance for any comments and thoughts about this.
D
sandy
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sandy
Post Re: Wrong NEMA-17 motor?
on: May 21, 2016, 21:10
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You're pretty safe DaniK, same orientation (with the screw adjuster at the same end), it'll just drop right in.

Only things you might like to adjust might be the supply voltage (though no less than 8v), and the current to the motors. The screw adjuster on the driver controls the current. If you set it moving then you can twiddle this screw until you find a smooth sounding setting.

Tuning stepper drivers for strength and subtlety

It's actually pretty hard to damage these things, the chips have a thermal cutout if they're overheating. The motors can be over-powered, and it makes them hot and move suddenly and noisily, but the worst that'll happen is that you'll burn your hands on them (oh, or your sprockets melt - that happened before). Just turn the current down a bit.

The way to damage the drivers is to disconnect the motors while they are energised - the return current surge makes them die. Other than that, I've never managed to kill one.

sn
DaniK
Beginner
Posts: 34
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DaniK
Post Re: Wrong NEMA-17 motor?
on: May 23, 2016, 19:17
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Thanks! Don't know why I didn't find that post before....
I also found that very helpful: [url]https://www.youtube.com/watch?v=89BHS9hfSUk
[/url]

now I just need to figure out how to glue the heat-sinks on and I am good to go 🙂
sandy
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sandy
Post Re: Wrong NEMA-17 motor?
on: May 25, 2016, 07:39
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You can get fancy thermal transfer cement, or adhesive pads, but superglue (cyanoacrylate) is good for that too.
DaniK
Beginner
Posts: 34
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DaniK
Post Re: Wrong NEMA-17 motor?
on: June 27, 2016, 15:47
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works like a charm (superglue)! thanks Sandy! now I have 2 <3
AbbyGelber
Newbie
Posts: 1
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Post Re: Wrong NEMA-17 motor?
on: October 18, 2016, 17:37
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Hi...i am a new user here. As per my knowledge the motors pulling too much power through the drivers. Without knowing which driver shield you're using, I can't really suggest a option. Some motor drivers are adjustable, so you can modify the power, but others have to have the motors matched to them.

electronic circuit assembly
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