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(Almost) Definitive guide on Motors (WIP)

This topic contains 141 replies, has 63 voices, and was last updated by  André Vieira 1 hour ago.

10
beltran lyricalpolymath

(Almost) Definitive guide on Motors (WIP)

13/05/2016 at 20:17

Hey everybody,
I’ve summarised a bit of the various posts on the motors that can be found around in this forum, and wrote this Google Doc that you can all see, comment and edit.

check it out and help complete it if you can / want.
The idea is to start preparing a simple, clean doc about the motors to expand the awesome specsheets that @davehakkens produced.

let’s keep the messy discussion here in the forum or as comments in the doc and there put only the final results.

It would be great to put some examples, with the pictures of the label of the working motors that people are using.
@davehakkens could you post a pic of yours or is it all painted in grey? 😉

If anyone here has made the machines and they are working, please post images of the nameplate of your motor and what the pros and cons you see in them

this doc builds on many other posts and contributions that you can find in these forums:
Motors
Shredder Motor
Realistic Cost Shredder
All posts that name “motor”

Let me know what you think
thanks to all

ps I’m in Malaga, Spain too if any other spaniard wants to hook up. We also found some providers we can talk about and if we order all together the pieces maybe we get a discount 😉

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dedicated
07/05/2018 at 15:52
2

Torque list!

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starter
07/05/2018 at 17:44
2

Handy table for torque. Just curious what are the colour codes for?

 

Working it out isn’t really the issue it’s what sellers list it as on eBay that’s usually off. And knowing what torque we need for each machine.

dedicated
07/05/2018 at 18:51
2

The coulors are Just to locate faster which combination between motor and gear are almost the same. For the Shredder Ithink we need minimum of 300 NM to shred without problems, I will try in the next days, for the extruder I don’t know because I have never built one.

warrior
08/05/2018 at 07:18
3

@allans are you going to use those motors on an extruder? because they won’t work for a shredder.

0.37kw is not enough for shredding, and if you convert the motors to single phase the resultant power will be even less. There are plenty of videos in youtube that show how to convert a 3 phase motor to single phase, you need to get some capacitors and rewire it.

helper
17/05/2018 at 10:07
2

This is amazing @lyricalpolymath! thanks for creating this it has seriously helped!

starter
11/07/2018 at 07:34
2

I am getting some issues trying to get conected my three phases motor, I was wondering if I need to be worried about what kind of conection i need to start ande wich one after starting. May be someone has a diagram how to wire a threephases motor correctly or a tip that can share.

thanks for all

new
11/07/2018 at 14:08
1

@unratonloco, there is plenty on youtube about, just search for ‘3 phase motor’ or variants of it: ‘3 phase motor wiring’. You can go also with trial and error, also take into account the kind of connection: delta or star, google gives you lots of results about ‘3 phase motor delta star connection’, images & videos. there is not much to it at the end.

starter
30/07/2018 at 21:56
2

I’m starting work on the extrusion machine. I’ve been searching these forums for some info on what sorts of motor work well for this; there are loads of posts about the shredder motor but very little I can find on the extrusion motor – can anyone point me to some good threads on this or put info here (this seems like the best place for it (a sticky thread on motors, but the google doc is almost all about the shredder).
Ideally I’d like some tips on what sort of equipment has the correct type of motors and gearboxes in them; or is it best to buy a new motor and gearbox set?
This thread on the shredder motor is great:

shredder build IDEA


Is there anything similar out there for the extrusion machine?
Thanks

new
31/12/2018 at 06:23
2

Hi! I’m trying to figure out in my country (El Salvador) if it’s easy or hard to find a good motor, and I’ve found this one:

 

https://santatecla.olx.com.sv/motor-electrico-reductor-de-velocidad-iid-1036007126

The last image has the specs of the motor and also the seller states that the output speed is 45 RPM. The motor already has a reductor, it’s a 3 phase, so if it already has a reductor I shouldn’t worry about it right?

Thanks in advance.

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new
03/05/2019 at 09:44
2

Goodmorning,

I want to build a shredder machine. I am looking for a motor. Since I know nearly nothing about electricity I’ve spend the last few days reading many topics on this forum.

I want to use the shredder at home. I do have 1 phase electricity. I read in the  google docI that after plenty of testing it turned out that shredding machines on 1phase will definitely not work.  If hat is true I can stop my project since I have no 3 phase option. However in later posts (the document is end 2017) many people have asked questios about 1 phase shredding motors and have been given positive reply’s …. So that has left me confused. Can somebody please help?

I want to shred PLA (messed up 3d prints) to about 5 mm pieces.
Is that even possible on a 1 phase electricity supply?
And if so, will a motor with these specs do? It is an old paint mixing machine with speed reduced to 30 rpm.

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new
03/05/2019 at 13:27
1

you can use single phase motors but its not recommended. to run a 3 phase motor (2 + Kw), you need a VFD (3Kw = 120 Euro) which also provides more control and fine tuning as well safety (fault/over torque protection) ; see buying guide here.

dedicated
03/05/2019 at 18:28
2

Well, for shredding failed PLA prints, there is always this option
https://www.youtube.com/watch?v=rrGHxHEwGcs

starter
03/05/2019 at 22:16
2

Single phase shredding can work. The torque can be high enough if you are willing to accept a slower speed. Look at this thread: https://davehakkens.nl/community/forums/topic/shredder-bulid-idea/
I’m working on a shredder using the same basis, but it’s not finished yet.

new
05/05/2019 at 11:34
2

Thanks for the reply and the tip.
I was looking for a wood chopper. Looks like a good option. I think I will go for that!.

starter
05/05/2019 at 21:43
2

If you get  wood chopper just be aware that there are two types. The type you want includes a gearbox which slows the blade down so it slowly grinds the wood. There is another type which has a very fast spinning disc with blades on it. The fast type doesn’t work well with plastic – it makes a huge noise and takes a very long time; eventually you end up with a plastic dust which is not very good for several reasons (hard to collect, blows around, colours get so well mixed that everything you make is brown).

starter
07/05/2019 at 08:38
2

Right, I’ve got a motor running at 4,000 RPM, 2.4 kW, 240v, 2 pole. From what I can tell I’ll need at least a 50:1 gearbox, if not a 70:1.

new
11/05/2019 at 19:41
2

Hi all, I am just getting started. So please forgive the basic question.

 

I’m procuring a motor, and I’d like to know if this one could work. Would someone with experience give me some advice? I don’t know much about motors.

I imagine I’ll need a reducer. Thanks in advance for the help.

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new
11/05/2019 at 23:11
1

should be fine, most heavier duty motors I’ve came along were around 1500 RPM, I can’t tell why but may be because they run more steady and longer; especially considering the bearings have to swallow whopping 3000 RPM it makes sense. More or less you need 50 – 70 RPM for the v3 shredder; you would need at least a 1:40 reducer, 1:60 would be better (more torque) but slower. From what I’ve read it’s not ideal for the gearbox to have so much reduction because of the friction and energy loss it creates. If you don’t have 3 phase, you need also an inverter (which gives you also over torque protection), cost around 120 Euro new, 80 second hand. Here’s a collection of useful  calculators (collected from the forum here).

@andyn

starter
12/05/2019 at 21:49
2

That is a high quality motor made by Emerson used to run centrifugal pumps. It is close coupled and fan cooled rated for 40C. They use these a lot in agricultural situations. Btw, going from single phase to three phase is called a converter, an inverter changes DC to AC.

starter
12/06/2019 at 06:17
0

I seem to be experiencing a very uncommon problem.  One of these single phase air compressor motors I pulled had a rusted bolt going through the top of the compressor fan, apparently holding everything together.  Now that it has been removed I would assume I should be able to simply pull it apart.  My other motor had a bolt near the bottom I was able to unscrew and the whole thing came off the shaft, but this one seems to be held together by sheer force of will.
Is that other little thing on the top another bolt, or is there anything else I can do to get this thing apart?  Has anyone else here experienced something like this?

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starter
17/06/2019 at 15:27
0

Hi! I’m starting to get everything ready to build the shredder, so i had the luck to find a bunch of motors in my backyard. I found this motor with a reducer and I would like to know if these specs are appropriate for this project.
The tag with red letters is from the motor and the greenish one is from the reducer.
From what i can see (excuse me for the dirty tags :s) the motor has these specs:
2,2 kW- 1420rpm; 2,6 kW- 1720rpm
And the reducer has these specs:
97,3rpm
I wonder if the reducer’s rpm is suitable to this project instead of the 70rpm desired rotations per minute. Thank you!

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