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  • pault
    replied
    This video describes how to orient the magnets, for a horizontal bearing.

    [VIDEO]https://www.youtube.com/watch?v=PNR5eBFXI4E&ebc=ANyPxKr9DFWFbluS3fLsaI453b 6ux9pPcoF8QziP_2ZyzCuqeNfUVSk4vLMSddVqHY0OSaaTL1Zf-wwnMM_uH2rxqJjkENPphQ[/VIDEO]

    Leave a comment:


  • pault
    replied
    Thanks for the replies. More food for thought.

    I had thought that I was building something like this:

    https://www.youtube.com/watch?v=wMy5d3vC2dk

    , but, I get a mag field "surprise" - it does not suspend the axle+magnet in the centre hole but either strongly repels it away from the centre or strongly attracts it into the centre (the magnets are not perfectly balanced, so it favours a particular magnets and sticks to the edge of the inner hole).

    I am hoping to use this bearing in the lateral direction (I want to put a vertically oriented wheel on it).

    On review, I see:

    - My magnets are all the same size (unlike the video), 7 (neos, no centre holes) on the outside ring, 1 (with a centre hole) on the axle. All magnets on the outer ring face in the same directions (e.g. N left, S right). When I (manually) bring the axle magnet S side towards the S side of the ring, there is a well of strong attraction into the centre hole (and a huge hump of repulsion on the other side).

    - the youtube shows a backstop, which I do not have - I guess that magnet rings are pushing / pinning the axle laterally into the backstop?

    My first questions are: Should all the magnets on the rings be facing in the same directions? Have I got things too closely spaced thereby creating too great a field? Why does the above video (plus a few others) appear to show the centre magnet's "bloch wall" pointing at the "bloch walls" of the outer magnets while suspending the axle nicely?

    [I'm going to be trying some of the ideas out, but if someone can get me down the learning curve faster, I'd appreciate it.]

    Leave a comment:


  • Allen Burgess
    replied
    suspension spinner.

    @CANGAS,

    Here's a couple of photos:
    Last edited by Allen Burgess; 08-02-2017, 02:10 PM.

    Leave a comment:


  • Allen Burgess
    replied
    Originally posted by CANGAS View Post
    Thanks for your helpfulness.

    My system is too slow to do youtubes.

    A picture or a photograph?


    CANGAS
    I'll try and upload photos; Meanwhile here's another cool video:

    https://www.youtube.com/watch?v=Sxeg3IrE3yI

    Leave a comment:


  • CANGAS
    replied
    Originally posted by Allen Burgess View Post
    This one's the best; Two large steel ball bearings between two disc magnets in attraction. A precision perpendicular gudgeon and pintle, at the base with no downward pressure on the base of the pintal, just in suspension, would produce frictionless high speed air cushion, zero wobble stability! The suspension bearings at the top can float completely apart by a tiny space! No physical contact what-so-ever is achievable.

    Another stability alternative would involve a second set of disc magnets and ball bearings, narrowly seperated in attraction, at the base:

    https://www.youtube.com/watch?v=dQSnZnDRUdA

    A second generation model; 5 hours of free spin:

    https://www.youtube.com/watch?v=_STnL0U9PyQ

    Thanks for your helpfulness.

    My system is too slow to do youtubes.

    A picture or a photograph?


    CANGAS

    Leave a comment:


  • Aaron
    replied
    magnetic bearing

    Here are a few threads here:

    http://www.energeticforum.com/renewa...gnetic+bearing

    http://www.energeticforum.com/renewa...gnetic+bearing

    http://www.energeticforum.com/renewa...gnetic+bearing

    http://www.energeticforum.com/renewa...gnetic+bearing

    http://www.energeticforum.com/renewa...gnetic+bearing

    http://www.energeticforum.com/renewa...gnetic+bearing

    Leave a comment:


  • Allen Burgess
    replied
    Magnetic bearings.

    This one's the best; Two large steel ball bearings between two disc magnets in attraction. A precision perpendicular gudgeon and pintle, at the base with no downward pressure on the base of the pintal, just in suspension, would produce frictionless high speed air cushion, zero wobble stability! The suspension bearings at the top can float completely apart by a tiny space! No physical contact what-so-ever is achievable.

    Another stability alternative would involve a second set of disc magnets and ball bearings, narrowly seperated in attraction, at the base:

    https://www.youtube.com/watch?v=dQSnZnDRUdA

    A second generation model; 5 hours of free spin:

    https://www.youtube.com/watch?v=_STnL0U9PyQ
    Last edited by Allen Burgess; 02-12-2016, 11:07 PM.

    Leave a comment:


  • bistander
    replied
    Magnetic bearings

    Here's another one:

    https://www.youtube.com/watch?v=HIL5WDgnhjA

    K&J Magnetics Blog

    Leave a comment:


  • thx1138
    replied
    Here's one version. The idea is to use the repulsion of same magnetic poles to suspend the shaft in air without contact to a bearing. There are also commercial ones available that are very pricey.

    https://www.youtube.com/watch?v=V0BCFel74U8

    Leave a comment:


  • pault
    started a topic magnetic bearing

    magnetic bearing

    How does one build a magnetic bearing?

    I'm playing with 3D printing and am trying to start out simple.

    I'm missing "something" about how to orient the magnets to form a magnetic bearing.

    thanks
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