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Thread: 240V Motor for SG
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7th Mar 2020, 09:48 PM #16
Hi Kryn,
Possible options !
If you can get hold of a treadmill motor or a BLDC motor the vibration would be non existent assuming that they were well balanced, which is usually the case.
Another possible alternative could be a front loading washing machine motor ! The ones with an armature and brushes, they require a variable DC voltage and can run at very high speeds. The end of the shaft is usually for a poly "V" belt.Best Regards:
Baron J.
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7th Mar 2020, 09:57 PM #17Most Valued Member
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7th Mar 2020, 10:50 PM #18Member: Blue and white apron brigade
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I agree - comparisons are very difficult, made worse because most all of the motors I get hold of are used.
A more reasonable comparison would be comparing new same powered motors from the same manufacturer. The most likely new motors I can get my hands on are budget end Conon SP and 3P motors and while these do come my way occasionally I usually haven't been able to hang onto them long enough to test them.
I wish I lived a bit closer to one of my Northern Italian Cousins who owns an electric motor manufacturing business as he would let me have all manners of motors to test. He mainly fabs small runs of custom made motors. I should contact him to see if he has any data on this. Interestingly he has over the last 10 years or so moved from mainly making SP to 3P motors with built in VFDs, and recently told me it has almost become cost effective to replace all SP motors with a 3P motor with built in simple VFD.
OTOH northern Italy is not that good a place to be right now.
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7th Mar 2020, 11:12 PM #19
Hi Guys,
Having seen Brooks, Brooks Crompton, motors being manufactured at Huddersfield and Doncaster, I can vouch for the great care that was taken in manufacture both of the hardware and electrical components. Whether that still holds true or not I don’t know since the original company has been taken over a number of times. Anyway the motors that seem to be commonly around today are rubbish by comparison.Best Regards:
Baron J.
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8th Mar 2020, 12:01 AM #20Golden Member
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8th Mar 2020, 09:17 AM #21Most Valued Member
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8th Mar 2020, 01:36 PM #22Most Valued Member
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Went through my stash of motors and found a 3 phase 1hp motor 1420 rpm. It's a Y motor but has 6 wires (3 Red and Black) going into the motor, so I think it can be converted to a star to be able to run off a VFD, (HOPEFULLY).
KrynTo grow old is mandatory, growing up is optional.
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8th Mar 2020, 02:01 PM #23Member: Blue and white apron brigade
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8th Mar 2020, 04:35 PM #24
Kryn,
I have a couple of tread mill motors it they are any good for you.
Ratty 05/2004 -05/07/2010 COOPER 01/08/1998-31/01/2012
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8th Mar 2020, 05:46 PM #25Most Valued Member
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Hi Bob, the wires inside the box have been disconnected, so it'll be a sparky job to sort it out.
Here's a pic of the mess of wires in the box.
3P wiring.jpg
Hi Mark, I'll take them off your hands next time you come down this way.
Thanks,
KrynTo grow old is mandatory, growing up is optional.
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8th Mar 2020, 06:08 PM #26
OK Just remind me before I leave.
Ratty 05/2004 -05/07/2010 COOPER 01/08/1998-31/01/2012
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8th Mar 2020, 08:14 PM #27Member: Blue and white apron brigade
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Yes given what I see in the picture I'd definitely recommend a sparky.
Don't quote me, but with any luck the centre terminal could be the common point, OR it could be an earth
A multimeter would sort that out but either way the pairs of wires could would need to be connected up in a specific way or it would rapidly let out the smoke.
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8th Mar 2020, 08:22 PM #28Most Valued Member
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Thanks for that confirmation Bob, a sparky will DEFINITELY be doing it.
Electrickery and me don't really go that well together.
KrynTo grow old is mandatory, growing up is optional.
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8th Mar 2020, 09:27 PM #29Golden Member
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The graphs showing vibration figures are very interesting Bob as I had always wondered about whether a 3 phase motor was actually more smooth running than a single phase, the chart seems to indicate that they are. I have read the text accompanying the chart a few times and find some of the information confusing especially the results for the 3p motor at 55Hz, maybe it's a typo?
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8th Mar 2020, 09:46 PM #30
Hi Lex,
Its simply saying that vibration gets worse as rotational speed increases.
As you spin an out of balance rotor the centrifugal force gets larger as the speed increases, as does the frequency of vibration. The heaviest part tries to move to the centre of rotation.Best Regards:
Baron J.
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