Free 186 More Best Homemade Tools eBook:  
Get 2,000+ tool plans, full site access, and more.

User Tag List

Results 1 to 6 of 6

Thread: MAGNET LEVITATION EXPERIMENT

  1. #1
    Supporting Member
    Join Date
    Feb 2019
    Posts
    141
    Thanks
    8
    Thanked 231 Times in 88 Posts

    mariost's Tools

    MAGNET LEVITATION EXPERIMENT

    I use a coil (450 r-0.5 mm) a hall sensor inside the coil and a mosfet as a switch for the current to the coil. The diode protects the mosfet from the back emf of the coil. A resistance controls the current to the base of the mosfet. The coil attracts the magnet , then when the supply stops the magnet begin to fall , the supply to the coil begin again and attracts the magnet again .This happens many times per second and the magnet seems to stay in the same place.
    I try to find a shematic for the opposite effect. The object that levitates to be up and the electromagnet to be down.I' ve seen a system of 4 coils and 2 hall sensor but I cannot find it's shematic .Doew anyone can help? Thank you. You can watch this experiment here:
    Attached Thumbnails Attached Thumbnails MAGNET LEVITATION EXPERIMENT-img_20180702_145805.jpg   MAGNET LEVITATION EXPERIMENT-img_20180625_155930.jpg   MAGNET LEVITATION EXPERIMENT-img_20180630_170423.jpg   MAGNET LEVITATION EXPERIMENT-img_20180630_170500.jpg   MAGNET LEVITATION EXPERIMENT-img_20180630_172423.jpg  


    186 More Best Homemade Tools eBook
    Last edited by mariost; Apr 22, 2019 at 05:00 AM.

  2. The Following 2 Users Say Thank You to mariost For This Useful Post:

    Scotsman Hosie (Apr 23, 2019), Seedtick (Apr 22, 2019)

  3. #2
    Supporting Member Scotsman Hosie's Avatar
    Join Date
    Apr 2017
    Location
    Salt Lake City, UTAH
    Posts
    359
    Thanks
    4,937
    Thanked 85 Times in 60 Posts

    Scotsman Hosie's Tools
    Ingenious use of the Hall sensor. Kind of the "Segway" of magnetic levitation, eh?

    2000 Tool Plans

  4. #3
    JTG
    JTG is offline
    Supporting Member
    Join Date
    Dec 2018
    Posts
    59
    Thanks
    12
    Thanked 93 Times in 43 Posts
    K and J Magnetics had a blog post a while back where they built the inverted setup with ratiometric sensors, but they didn't provide a detailed schematic. I get quite a few hits when searching for "repulsive electromagnetic levitation schematic," but there are about as many ways to go about doing it as there are people building them.

  5. The Following User Says Thank You to JTG For This Useful Post:

    Scotsman Hosie (Apr 27, 2019)

  6. #4
    Supporting Member
    Join Date
    Feb 2019
    Posts
    141
    Thanks
    8
    Thanked 231 Times in 88 Posts

    mariost's Tools
    I 've found two shematics but there are a few correctionts from other vewers so i am not so sure that they are right.

  7. #5
    Supporting Member Scotsman Hosie's Avatar
    Join Date
    Apr 2017
    Location
    Salt Lake City, UTAH
    Posts
    359
    Thanks
    4,937
    Thanked 85 Times in 60 Posts

    Scotsman Hosie's Tools
    Quote Originally Posted by mariost View Post
    I 've found two shematics but there are a few correctionts from other vewers so i am not so sure that they are right.
    I wonder if the circuitry commonly used for switching power supplies couldn't be used – or adapted – to work with that set up? (Just a thought.)

  8. #6
    Supporting Member jdurand's Avatar
    Join Date
    May 2019
    Location
    Krasnodar Krai, Russian Federation
    Posts
    1,456
    Thanks
    126
    Thanked 742 Times in 416 Posts

    jdurand's Tools
    You could easily feed the sensor into a small microcontroller like an LPC80x series or even an STM8 series. That would smooth out the detections and output a PWM signal to drive the coil. You'd have at least part of a PID loop in the processor.

    You could also sense the location of a shiny object like a ball bearing with an infra-red photo beam. That would give you an analog position of the ball and make smooth control easier.



    186 More Best Homemade Tools eBook

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •