Closed loop stepper motor kit power supply

[the great waldo]

I'm contemplating getting 3 of these kits
https://www.omc-stepperonline.com/1-axis-closed-loop-stepper-kit-4-25-nm-601-97-oz-in-nema-24-closed-loop-stepper-motor-driver.html
I've got parts for an unregulated power supply 36 volt 500va toroidial transformer which should give me just over 50 volts (36x1.4) am I pushing my luck as the listed voltage on this kit is 36-48volts ? Or should I use a lower power transformer ? or can I reduce the voltage output somehow ?
Thanks in advance
Andrew

[Voicecoil]

Yes, you could be pushing your luck, depending on the robustness of the driver module :whistle:. 36V x root 2 =50.9V peak, subtract 1.6V for rectifier losses and you'll get a peak on-load voltage of 49.3V. But due to the regulation factor of the transformer, when you're not pulling much power it will rise by probably 5% = 51.8V. And that's at nominal mains, remember it can vary by up to 10% (though I've never seen it up by more than 6% here), so taking that figure you could land up with 55V off-load, high mains. I anticipated the same problem on my setup (albeit with a 35V transformer which makes things a tad better) so have designed a regulator circuit which limits the voltage to slightly over 49V. I haven't fully tested it yet, but will let you know how it works once I've given it a thorough work out.

[dazp1976]

I'm contemplating getting 3 of these kits
https://www.omc-stepperonline.com/1-axis-closed-loop-stepper-kit-4-25-nm-601-97-oz-in-nema-24-closed-loop-stepper-motor-driver.html
I've got parts for an unregulated power supply 36 volt 500va toroidial transformer which should give me just over 50 volts (36x1.4) am I pushing my luck as the listed voltage on this kit is 36-48volts ? Or should I use a lower power transformer ? or can I reduce the voltage output somehow ?
Thanks in advance
Andrew

I'd be a bit iffy.
Lower the power.
https://electro-dan.co.uk/electronics/wiringtrans.aspx
Personally I'd get a set with a 80VAC capable driver and just series wire a 35 to 40v toroidal.
I've seen motors that have the same or higher torque claiming only 2.2mh inductance.

[the great waldo]

Hi Voicecoil
If you get your voltage dropper tested I would be grateful to see the circuit.
Cheers.
Andrew

[Voicecoil]

Sure thing. BTW, it also does a nice soft start to charge up the reservoir caps gently without pulling 60+ amps on switch on.

[Doddy]

What's the primary coil rating of the toroidal? If 220V then you might be well over the design limit of 48V with a 240V supply.

Personally, if the rectified voltage was 49-50V I probably wouldn't lose sleep over using them myself, but would never design around this for a third party.

[JAZZCNC]

I've used and killed these drives.! . . They don't tolerate any overvoltage. 51V will 100% Kill them and with Back EMf and/or Mains fluctuations you will hit 51V with 36V primary. I Wouldn't go much above 30Vdc with Prime and to be honest you won't notice any difference the few volts gives you.

[the great waldo]

Hi Jazz
I'm always glad to hear of someones own experience of an electronic piece of equipment. My cnc machine is going to be mainly used for carving wood, guitar making etc. Is the improvement in a closed loop system worth the upgrade? I've got the parts Leadshine MX3660 , steppers are https://www.upload.sorotec.de/doku/manuals/ST6018L3008.pdf and an AXBB-e controller. If it's worth it in performance I would upgrade as I haven't put the machine together yet and the time saved as opposed to removing the motors and upgrading later would be worth doing it now rather than later.
Cheers
Andrew

[the great waldo]

Hi Jazz
No need to reply on this. I've just checked out some of your previous posts, which lets me think that staying with what I have will be good enough for what I need.

Cheers

Andrew

[JAZZCNC]

I'm always glad to hear of someones own experience of an electronic piece of equipment. My cnc machine is going to be mainly used for carving wood, guitar making etc. Is the improvement in a closed loop system worth the upgrade?

Yes, there is a difference compared to a standard stepper, esp when doing 3D type work with lots of fast small movements as the closed-loop system ensures position with fast direction changes.

I've used about 12 sets now of closed-loop systems from different manufacturers and varying sizes from 2Nm nema23 to 12Nm nema 34 and all of them perform better than standard stepper system. Basicly just a little bit stronger, little smoother and in general feel more reliable.


However,Like wise I've built Dozens of machines using standard stepper systems without any problems. So if you have sized the motors/drives/voltage correctly for the size of your machine and left enough power for when running at higher feeds then you won't have issues.
Personaly because you already have the parts, provided they are sized correctly then I wouldn't have any qualms using them at all.

If you were buying from scratch then I'd Say get Closed-loop everytime because the difference is price isn't so great now and the extra cost is worth it.

[JAZZCNC]

Hi Jazz
No need to reply on this. I've just checked out some of your previous posts, which lets me think that staying with what I have will be good enough for what I need.

Cheers

Andrew

Too Late....Lol

[the great waldo]

Too Late....Lol
Well youv'e got me thinking after your last reply. I can you the bits I have to upgrade an older machine and don't mind spending a few bob on something that runs better and I will be doing a fair amount of 2.5/3d cutting, and i'm getting old so anything that runs a bit better (quicker smoother ) i'm happy to invest in. Now the killer question is are the stepperonline kits ok (they seem to have great prices and there seems to be a 5% discount for us members) or should I look around a bit.
Cheers
Andrew

[the great waldo]

What's the primary coil rating of the toroidal? If 220V then you might be well over the design limit of 48V with a 240V supply.

Personally, if the rectified voltage was 49-50V I probably wouldn't lose sleep over using them myself, but would never design around this for a third party.

Hi Doddy
We have 220 volts here in Austria,
cheers
Andrew

[JAZZCNC]

Now the killer question is are the stepperonline kits ok (they seem to have great prices and there seems to be a 5% discount for us members) or should I look around a bit.
Cheers
Andrew

I've only used this brand on one machine and they worked fine. No better or worse than any of the others I've used and that includes Leadshine.
I did Kill one drive but that was my fault oversizing the PSU which is why I know they don't tolerate Overvoltage.!

[the great waldo]

Thanks good to know.
Cheers

Andrew

[Kitwn]

Many of the Stepperonline drivers have 'Leadshine' written on them as well and their part numbers generally match. One of the reasons I've used them in the past is that buying a 'Stepperonline' driver from Stepperonline seems like a good way to guarantee I'm not getting a counterfeit Leadshine driver.

Kit

[JAZZCNC]

Many of the Stepperonline drivers have 'Leadshine' written on them as well and their part numbers generally match. One of the reasons I've used them in the past is that buying a 'Stepperonline' driver from Stepperonline seems like a good way to guarantee I'm not getting a counterfeit Leadshine driver.

Kit

Can't really say that for certain because I've had drives that look identical to Leadshine with matching numbers etc but when you open them up you can clearly see they are not made by leadshine as the quality is terrible. The counterfeiters are very clever and don't miss a trick regards Visuals and identifcations.

Unless Stepper online sell them as Leadshine drives and if they where genuine leadhsine why wouldn't they.? I wouldn't it take they are Leadshine.!

[Kitwn]

Some of the drivers have both Leadshine and Stepperonline logos. The manual says "designed by Stepperonline. Manufactured by Leadshine". I'll let you make up your own mind.

https://www.omc-stepperonline.com/digital-stepper-driver/digital-stepper-driver-03-22a-18-30vdc-for-nema-8-11-14-16-17-stepper-motor-dm320t.html

Kit

[Doddy]

** Ignore, I'm getting Austria and Australia confused **

(Looks at watch: I'm going back to bed...)

[the great waldo]

Well it looks like i'm veering towards the following configuration.
https://www.omc-stepperonline.com/1-axis-closed-loop-stepper-kit-3-5-nm-495-74-oz-in-nema-24-closed-loop-stepper-motor-driver.html
https://www.omc-stepperonline.com/1-axis-closed-loop-stepper-kit-4-25-nm-601-97-oz-in-nema-24-closed-loop-stepper-motor-driver.html
I'm not sure which one of these to choose as the price is only a few euros more in the stronger motor.
https://www.omc-stepperonline.com/power-supply/500w-36v-14a-115230v-switching-power-supply-stepper-motor-cnc-router-kits-s-500-36.html
I could by a new transformer to go with parts I have from my previous unregulated supply but would probably cost as much or more as the switching supply above.
The machine this lot would go on is the following which I already have.
https://www.sorotec.de/shop/Portal-milling-maschine-CL-Line-0804-DIY-4862.html
Its main use would be for wood carving (guitar making ) and some light metal/plastic milling. Any opinions would be gratefully accepted. Looking at the steppersonline site I like the idea from buying from one scource. They seem to have all the extra cable extensions etc. at a reasonable price and ship from Europe which saves a lot in Duty and taxes.
Cheers
Andrew