What is Electromagnet design: Definition and 19 Discussions

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.
The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.

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  1. user2539

    Magnetic equivalent circuit for a UU-core inductor

    Hello, I am trying to develop a magnetic equivalent circuit for a UU-core inductor with two parallel bus bars in the middle of the slot. I am not sure as to how to model the MMF in such problem. The logical way in my mind is to have two current sources to represent the fields of each bus bar...
  2. P

    Engineering Magnetic field strength of an electromagnet (coil wound around a bobbin)

    I am trying to design an electromagnet which consists of a copper PVC sheathed wire wound around a cylindrical plastic spool of Circumference (C) = pi x diameter. The spool has a hollow body of diameter D1. This wire has maximum length (L), cross sectional area A, resistivity P. The spool once...
  3. derekmatthew

    Trying to make an electromagnetic shaker device

    Hello, I'm trying to make an electromagnetic shaker but I'm not sure if this is possible? Basically I want to wrap an iron core with a solenoid and use AC to shake a magnet at some distance away. I'm not certain on the approach at the moment but I'm kind of looking at the feasibility at the moment.
  4. Arturas Surblys

    How strong should an electromagnet be to elevate a 1kg mass?

    Hello Everybody, Can somebody help me to find out about Electromagnets and Electric motors? I hope that here it is possible to get an expert opinion about the next question. How strong should be electromagnet to elevate and hold f.e. 1 kg weight in the middle of a ferrous environment (f.e. cube...
  5. M

    Electromagnet Design for Separating Ferrous Material from an Ore Mixture

    Good day I've been the task of designing an electromagnet to remove ferrous material from ore mixture. I've calculated the flux density require to remove the particle from underneath a burden depth of 400mm; which is 792.7177 Gauss. (Force index is: 1.5710*10^6 G^2/m) However what I've been...
  6. Y

    MOSFET or Rheostat or Potentiometer pros and cons?

    Preface: I'm a chemical engineering undergraduate student but as small-time and noob electrical engineering hobbyist. I really only have minimal experience in circuitry and the like. I want to build a series of electromagnets with a variable their strength in order to levitate an opposing...
  7. N

    Help in designing electromagnets

    Hi all, First post, be gentle... I'm trying to build a system based on the MIT Actuated Workbench. They used electromagnets with the following spec: 1.9cm (0.75”) diameter x 3.8cm (1.5”) length, wound with 32-gauge copper wire with a total length resistance of 120-122 ohms, with no metal...
  8. P

    EI Core electromagnet questions

    Hello. I am trying to design an EI-core electromagnet (think two c-shaped cores with their gaps abutting). The coils would go on the top and bottom legs of the E (legs B and C in my sketch). There is a sketchbelow and you can find one here...
  9. H

    Step-by-Step Guide: Designing an E-Shaped Electromagnet for a Magnetic Levitator

    Hi guys and gals Long story short I'm trying to make an magnetic levitator (like you can see on youtube), basically a floating metal ball, this will be part of a project I'm doing but the issue is I have absolutely no idea how to go about designing a electromagnet from scratch (which is a...
  10. M

    Design Electromagnet for 400-500 Oe, 100-800kHz

    Dear all, I need realizing an electromagnet producing a magnetic field changing in direction with a given frequency (from 100 to 800kHz). Max intensity should be 400-500 Oe. I need applying this magnetic field in a small region (10x 10 mm2) and I would prefer the electromagnet not so big...
  11. B

    What knowledge is needed for Electromagnet design?

    guys, I want to design a electromagnet. but i do not know how to start. so could you please tell me what knowledge is needed for electromagnet design? Or you can recommed some data that i can find and buy myself. thanks in advance!
  12. E

    Electromagnet Design - Value of inductance L

    Homework Statement Hi all, I am working on an electromagnet design. It is a C-shape with an air gap of 80mm. The number of coil windings is 320 turns. I would like to generate let's say B = 30 mT = 300 gauss in the air gap. Area of air gap Ag = 80mmX80mm = 6.4e-3. Mean length lg of...
  13. R

    Electromagnet Design Help Required

    G’day everyone I need some direction / advice in the area of electromagnet design. Application and restrictions: DC supply Push down and hold with 100N of force Pull up with 100N of force and hold with 1,000N of force (or pull up and hold with 1,000N of force) Stroke length: 10mm...
  14. B

    Electromagnet Design Questions

    Hey guys, so I have a couple questions about electromagnets that I was hoping to get some insight on here. Basically, I've been tasked with designing an electromagnet that is low-heat (<150F or so) yet high pull force. I'm improving on a past design where the electromagnet got way too hot (>...
  15. J

    Need Help With Large Electromagnet Design

    Hello Everyone. I'm very new to this website and am turning to anyone for help. I'm trying to design and build a large electromagnet to do some scrap metal lifting for me and my grandpa that can be hooked onto a crane/loader of a tractor/payloader. I'm currently studying electrical and...
  16. U

    Help with electromagnet design

    Hi everybody, I just had 100m of copper winding wire arrive in the mail so I can build an electromagnet. I'm aiming to pull a 5kg weight along, which is already floating on a separate magnetic field so all friction is removed except air resistance. What I want to do is put an...
  17. I_am_learning

    Design Powerful Electromagnet: Maximize Magnetic Field w/Constant Power

    I am trying to design a very powerful electromagnet for experimental reasons. However, I am wondering at his absurd sounding conclusion I arrived at! The governing equation of the magnetic field generated by a solenoidal electromagnet is B = u0nI Provided that I keep these things constant 1...
  18. L

    Design 1T Solenoidal Electromagnet w/ Core Permeability>1000

    I was trying to get the numbers to design a 1T solenoidal electromagnet with a core of permeability >1000 (electric steel or Permalloy). I think the permeability saturates at some field strength(0.2T?). But I am not sure how to use the formula after saturation. should I just use u0 instead of...
  19. C

    Which Electromagnet Design Works Best?

    I have magnet wire and I have steel with extremely high iron content. I was just wondering, if I were using the same amount of wire and metal no matter how I built it and I were just making a straight cylindrical electromagnet, what would be the more powerful design? More towards the short and...