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magnetic bearing

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  • 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

  • #2
    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

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    • #3
      Magnetic bearings

      Here's another one:

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

      K&J Magnetics Blog

      Comment


      • #4
        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.

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        • #6
          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

          Comment


          • #7
            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

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            • #8
              suspension spinner.

              @CANGAS,

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

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              • #9
                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.]

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                • #10
                  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]

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