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  1. #16
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    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.

  2. #17
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    Mar 2011
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    Quote Originally Posted by BobL View Post
    How much of this is due to a better construction of the 3P motor I'm not sure.
    In this case all of it...

    Comparing a Taiwanese single phase built to price for the mass market motor to an industrial grade WEG is comparing apples to a squashed frog. To suggest that a three phase motor is better based upon those results is well in my books.

  3. #18
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by racingtadpole View Post
    In this case all of it...

    Comparing a Taiwanese single phase built to price for the mass market motor to an industrial grade WEG is comparing apples to a squashed frog. To suggest that a three phase motor is better based upon those results is well in my books.
    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.

  4. #19
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    Sep 2012
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    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.

  5. #20
    Join Date
    Jul 2011
    Location
    Adelaide
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    837

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    Kryn

    Because the range of movement in the Z is so little when actually grinding you set the belt adjustment right for wheel just a little above the work then it is close enough for the few thousands different in height that the grinding operation will remove.

    Eric

    Quote Originally Posted by KBs PensNmore View Post
    Hi Robert, the Macson SG, of which mine is possibly a copy, has the motor mounted off the back, on a pivoting mount.
    Have attached a pic of the Macson for comparison.Attachment 385122.
    Thanks,
    Kryn

  6. #21
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    Jul 2010
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    Melbourne
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    Quote Originally Posted by racingtadpole View Post
    In this case all of it...
    Or possibly none of it.

  7. #22
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    May 2011
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    Murray Bridge S Aust.
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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).
    Kryn
    To grow old is mandatory, growing up is optional.

  8. #23
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by KBs PensNmore View Post
    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).
    Kryn
    Post a close up photo of the terminal box.

  9. #24
    Join Date
    Aug 2008
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    Tennant Creek, Aust
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    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

  10. #25
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    May 2011
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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,
    Kryn
    To grow old is mandatory, growing up is optional.

  11. #26
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    OK Just remind me before I leave.

    Ratty 05/2004 -05/07/2010 COOPER 01/08/1998-31/01/2012

  12. #27
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by KBs PensNmore View Post
    Hi Bob, the wires inside the box have been disconnected, so it'll be a sparky job to sort it out.
    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.

  13. #28
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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.
    Kryn
    To grow old is mandatory, growing up is optional.

  14. #29
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    Sep 2008
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    Riddells Creek, Vic.
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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?

  15. #30
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    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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