bank0066 Posted January 30, 2019 Share Posted January 30, 2019 Hi, just a question on electromagnets. If you had 2 electromagnets repelling against each other with a 140kg pull weight, would there be a way you Can adjust the distance between one of the magnets with a dial that could reduce and increase the pull weight ? E.g the further away the magnet the less pull weight it would have e.g 70kg and then turning the dial it to a higher setting it would pull the magnet closer pull the weight to 110kg? Link to comment Share on other sites More sharing options...
swansont Posted January 30, 2019 Share Posted January 30, 2019 Distance between one of the magnets? If you mean the two magnets, yes. Translation stages/tables exist. Turn the handle and move a screw to change the distance. Link to comment Share on other sites More sharing options...
bank0066 Posted January 30, 2019 Author Share Posted January 30, 2019 Oh that’s great so could adjust the pull weight of the 2 magnets with translation stages/tables ? And also could you adjust the pull weight to what you wanted . So if i wanted a pull weight of 120kg I could adjust the dial or type in on a screen 120kg it would adjust the that weight Link to comment Share on other sites More sharing options...
swansont Posted January 30, 2019 Share Posted January 30, 2019 1 hour ago, bank0066 said: Oh that’s great so could adjust the pull weight of the 2 magnets with translation stages/tables ? And also could you adjust the pull weight to what you wanted . So if i wanted a pull weight of 120kg I could adjust the dial or type in on a screen 120kg it would adjust the that weight You’d move the table until your indicator read the desired value, yes. 1 Link to comment Share on other sites More sharing options...
bank0066 Posted January 31, 2019 Author Share Posted January 31, 2019 Thanks! Appreciate it Link to comment Share on other sites More sharing options...
Sensei Posted January 31, 2019 Share Posted January 31, 2019 (edited) You can control strength of electromagnet by increasing current flowing through its wire. After exceeding current limit of wire, it's damaged. If really high currents are needed to create powerful electromagnet there are used superconductors, which are typically operating at extremely low temperatures. e.g. liquid Nitrogen and liquid Helium are used to cool down material to turn it to superconductor. https://en.wikipedia.org/wiki/List_of_superconductors https://en.wikipedia.org/wiki/Superconducting_magnet Edited January 31, 2019 by Sensei Link to comment Share on other sites More sharing options...
bank0066 Posted January 31, 2019 Author Share Posted January 31, 2019 So you could have a limiter somehow installed so the limit doesn’t exceed the limit of current flowing threw Link to comment Share on other sites More sharing options...
John Cuthber Posted January 31, 2019 Share Posted January 31, 2019 If you are using a translation table to alter the force on something, it may be easier to use a spring instead of the electromagnet. What are you actually trying to do? 43 minutes ago, Sensei said: You can control strength of electromagnet by increasing current flowing through its wire. After exceeding current limit of wire, it's damaged. If really high currents are needed to create powerful electromagnet there are used superconductors, which are typically operating at extremely low temperatures. e.g. liquid Nitrogen and liquid Helium are used to cool down material to turn it to superconductor. https://en.wikipedia.org/wiki/List_of_superconductors https://en.wikipedia.org/wiki/Superconducting_magnet Controlling the current is the obvious way to control the force, and I wonder why the OP hasn't chosen it. For a few hundred kilos of force you really don't need superconductors. https://en.wikipedia.org/wiki/Electromagnetic_lock#Electrical_requirements Link to comment Share on other sites More sharing options...
bank0066 Posted January 31, 2019 Author Share Posted January 31, 2019 Say example there’s 2 poles one side be side, one with an electromagnet on one with a normal magnet, I want to see if I could move the magnets in an up and down motion with the friction of the pull weight of e.g 30kg and then change the pull weight to e.g 60kg using a dial or to what ever weight I needed it to be ? If you understand? Link to comment Share on other sites More sharing options...
bank0066 Posted February 2, 2019 Author Share Posted February 2, 2019 On 1/31/2019 at 9:06 AM, bank0066 said: Say example there’s 2 poles one side be side, one with an electromagnet on one with a normal magnet, I want to see if I could move the magnets in an up and down motion with the friction of the pull weight of e.g 30kg and then change the pull weight to e.g 60kg using a dial or to what ever weight I needed it to be ? If you understand? Link to comment Share on other sites More sharing options...
John Cuthber Posted February 2, 2019 Share Posted February 2, 2019 I'm not sure what you mean but, if you want to change the pull from an electromagnet it's much easier to change the voltage (or current) than to change the distance. Link to comment Share on other sites More sharing options...
bank0066 Posted February 3, 2019 Author Share Posted February 3, 2019 Yeah so could I buy a transformer stage / table and could I somehow get it programmed to a dial that I could turn and then it would adjust the power of electro magnet . So I need it so the dial reads 20kg then I could turn it to 30kg and the electromagnet would have more current going to it Link to comment Share on other sites More sharing options...
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