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Help with finding shredder motor w/ reducer – USA

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  • This topic has 3 replies, 2 voices, and was last updated 2 years ago by Anonymous.
Phil S. wildplastic

Help with finding shredder motor w/ reducer – USA

03/04/2019 at 19:05

Hi all! Anyone in the US have any connections on a shredder motor? I have been looking for weeks on eBay with no avail. I would love at least 2hp and at least 40rpm output (as long as the torque is sufficient enough not to jam, at least 2,700lbs/300nm). My budget is $300-$400. Any help would be greatly appreciated, even what to search for on eBay.

P.S. Would anyone recommend just purchasing a motor and then a VFD instead of a reducer? Any set up recommendations? This sounds easier but I am sure I am missing something.

I found a 3HP 2.2KW 7A 220VAC SINGLE PHASE VARIABLE FREQUENCY DRIVE INVERTER VSD VFD. Could this be wired up to a 3hp motor and be good to go? This has a single phase input but a 3 phase output to the 3phase motor? This sounds too good to be true?

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03/04/2019 at 19:55

you want at least 2.2 Kw (3-4 Kw for shredding PET bottles), 3 phase with a common configuration of 1500 RPM and a reducer of 1:20. 3 phase is common since it’s way more efficient for this application. In top you need a 3Kw VFD. Here in Spain the motor with reducer is around 350 Euro, before 21% VAT. The VFD is around 145 Euro. Make sure its a original Huanyang , it has a orange label and a potentiometer. This VFDs enable you quite some extras: emergency switch, quick speed selector, backward, forward,…and if you like, auto-reverse via Arduino.

Unfortunately, most offers for motors on ebay & amazon and aliexpress go max. 1800 Watt so you’re more likely have to go to your next machine shop or find a special supplier.

eventually @justinc from precious plastic USA can help you … (he’s using single phase motors)

starter
03/04/2019 at 20:12

Thanks for the reply! I was under the impression that torque is more important than hp/kw. The configuration you recommended yields 280NM. The one below I actually just found yields 356NM. Would this be sufficient? Would it be more efficient to connect a 3hp motor a VFD or just to get this below? What are the advantages using a VFD vs reducer?

I just found this:
Brand:SEW EURODRIVE
Condition:Used
Model:FA47DT100LS4 DFT100LS4
Output RPM:60
Phase:3PH
Power:3 HP
Shaft OD:1-3/8 IN
Voltage (AC):230 V-AC, 460 V-AC
Shipping Weight:92.00 lbs
Shipping Dimensions:18.00 x 11.75 x 11.25 in

03/04/2019 at 20:53

that should be fine. Personally I don’t like used motors and especially reducers/gearboxes since they can wear out, thus not running that efficient anymore.  Anyways, if it’s in a good condition you could try.

A VFD gives you nothing more than enabling single phase to 3 phase and speed regulation and of course lots of inputs/outputs for extra electronics (forward/backward).

Also make sure that the input shaft is at least 30 mm (recommendation). And at this point I have to warn you that there are quite a few reports of broken or bent shredder shafts. We ship only with a 32 mm hexbar, 28 mm is fine too … I have the updated laser files in metric if you like.

And yes, for shredding house hold waste, anything above 300Nm will be ok. Shredding industrial waste (4mm thickness) needs more.

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