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17th Mar 2021, 12:51 PM #1New Member
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Wtb - 3hp (2.2kw) ~2800rpm 240v motor with 19mm shaft
Got a 3hp dust collector but the motor is 3 phase and apparently busted. I dont have 3phase so looking to swap it out for a 240v which i thought would be easy to source... oops
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17th Mar 2021, 02:06 PM #2Member: Blue and white apron brigade
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How do you know its busted?
It's pretty easy to check if teh wirings are intact.
1) Check the resistances of each of the windings and make sure they are all the same - a few ohms
2) Check the resistance of windings to earth should be more than 2MΩ
Post a poor of the motor junction box - it may be possible to run it off a 240V SP to 24V 3P supply using a VFD, OR using a 240- 415V VFD.
The added benefit of using a VFD is that the impeller can be spun at 60Hz providing about 20% more air flow.
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18th Mar 2021, 12:17 AM #3Most Valued Member
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A VFD on a dust extraction unit... nothing like over complicating things.
I have some motors floating around I知 prepared to part with, I値l have a look and see if I have anything close to your requirements and report back.
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18th Mar 2021, 08:49 AM #4Member: Blue and white apron brigade
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3P motors and VFDs are increasingly being used on dust extractors (DE). Most machinery out of China is designed for the north american market (60Hz) but DEs machines don't use pulleys so their pulleys cannot be changed to recover speeds @ 50Hz. As a result most DEs sold in Australian underperform their North American versions by 20% . In some cases it is possible to drive the DEs at 65 or 70 Hz garnering even greater performance. 20% doesn't sound like much but most DIYer DEs need every bit of suck they can get.
With increased speed comes increased noise and although DEs can (and should) be located or vented outside a shed, if a DC is set up right the air ducting intake/inlets on machines should be making a loud (ie irritating) hissing sound. If it's not doing this there's probably not enough flow even at 50Hz. For me this means wearing ear muffs even for relatively quiet tasks like turning and sanding. However, for tasks small workpiece jobs, high flows may not be required which means the DE speed can be reduced to <50Hz My DC is set up with outboard speed control but to make things easier I have set up a switch which dials in 40 - 50 - 60Hz.
Just a heads up with motors for DEs, they some are flange mounted (although making a foot-flange adapter is not out of out of the question) and more some need to have longer shafts than usual.
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29th Mar 2021, 08:04 AM #5New Member
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