Electromagnet Definition and 371 Threads

AC electromagnet questions--I'm smart, but not an engineer--Help! I need an AC electromagnet with these requirements: -17 Hz -square wave -40-60% duty cycle -will run on 60 Hz 110 volt current, and can be plugged into a wall outlet (this one is not an absolute necessity, but it...

We've heard of the water pipe analogy for electric circuit. It says that the current produces magnetic field and that the "pipe" is irrelevant - only the amp-turns are relevant. So I was wondering, is it possible to increase the amp-turns of a electromagnet by rotating it in the same direction...

Hello guys/gals I have a few questions regarding electromagnets that I'm hoping you can shed some light on for me. I don't know much about physics, magnets, etc. I am a career firefighter that is trying to build something requiring the use of electromagnets. 1. I'm trying to have an...

Does it take a certain amount of time for an electromagnet to reach it's full magnetic potential? For example, would a 1 nanosecond pulse of juice be enough to fully magnetize a small lifting electromagnet? Thanks in advance.

Hi, so i had an assumption and wanted to see if my assumption was correct so here goes. If we have a rather strong electromagnet with a constant field, when a metal object is introduced to the field, eddies form in the metal creating a magnetic field of opposite polarity. If a second...

Hello everyone I am trying to create a ring shaped magnet. If you coil wire around a toroidal core the magnetic field is only inside the toroid I want the magnetic field to be present around the outside and inside the hole of the toroid, the ring shaped magnet? I basically want the magnetic...

Hey, so I just ripped the two permanent magnets out of an old seagate hard drive, and have a breadboard for my electronics class to practice with logic chips, and figured id wrap some wire around one of the magnets and see what happens. I got around 10 turns of the wire about the magnet, and...

I'm part of a design group for a university design course and we need to launch a mass using the solenoid idea (iron rod wrapped with wire). The problem that I am having is calculating the force produced by the electromagnet given a certain voltage and current. I know that F=q(v x B) in this...

Hello All! I have a 24V 24A DC power supply that I am trying to hook a 50 loop electromagnet using 22 gauge non insulated copper wire and a small steel nail. Every time I hook the electromagnet to the power supply it sparks and Humms. So I put a 220 ohm resistor inline and it did not spark...

when two electro magnets are coiled the same and same direction of current are placed S to S so they repell... is the force acting upon them to separate ( push away ) exponentially increased (when they are very close) as each of the separate magnets current is increased? is there a formula I...

Hello all! I have created a basic electromagnet using copper wire coiled around a nail. When I hook a DMM in series with the electromagnet and my 12v 3Amp DC power supply, the DMM shows that the amperage fluctuates. It will not come to a certain number or switch between two numbers that are...

A magnet is attached (or over a small airgap) to the end of an electromagnet (EM) with a steel core, then the EM is pulsed with just enough juice to get the magnet to drop off. (just negating the attraction) Which will require less energy input to get it to drop off? 1) a high permeability...

Hey all I have constructed a basic electromagnet with a nail and a coil of copper wire. I plugged it up to a 9V battery to make sure it worked, which it did, but the electromagnet drained the battery fairly quickly since the coil is shorting the battery out. I have a 12 V 3A dc power supply...

Trying to determine the strength of an electromagnet in Teslas, with an iron core. Some sites have the same basic formula but with different units after B= Some use μ0, μr, or μ. Which one to use? For N (the number of turns), is this the general number of turns accounting for multiple...

I'm trying to get feedback on electromagnet design and specifically sourcing premium core material for a pulse coil electromagnet. I have seen this question asked a few times on this forum, but doesn't appear to have really been answered. What is THE BEST core material and where to source...

I'm trying to make an AC electromagnet (better frequency response compared to DC electromagnets) I could not find any document, book, or source to check if I'm on the right way or not. I have a coil and a core and working on them to increase magnetic field, right now it is not high enough...

Hey Everyone, So here is my situation. I have a PVC tube six feet long, with electromagnets placed at either end. In between the electromagnets is a steel disk. The electromagnets I have been researching are anywhere from 1in to 12in in diameter with breakaway strength of 14lbs to 3500lbs. What...

Hey, anybody out there good with electrical stuff?? I'm no genius but can I be correct in assuming the following? Im making high voltage electromagnets. If I use 1200 winds of awg30 magnet wire, it will have the same power ~ (EMF) Or (magnetic field strenghth) as 600 winds of awg15 magnet...

1. does the length of an electromagnet effect how strong it is or where the magnetism is located? 2. I am making an electromagnet and i am done with one layer how do i add one more do i start from where i started and go down or do i trail the wire to where i started.

does it have an ac or dc current? I think I still don't understand what is the difference between ac and dc. they both currents, both changing electric fields. (not static field since they are moving) they both creates a magnetic field. then what is the difference? (DC = steady...

Good Morning! Is it true, that supplied with the same voltage and current, an electromagnet with 10,000 turns of #40 wire will have the same lifting power as an electromagnet having 100 turns of #20 wire? (cores are identical). Thank You All!

I'm attempting to get a rough estimate on how the shape of an electromagnet pole will affect the field produced. Most of the poles you see in labs are tapered, and not simply cylindrical - I'm wondering how this affects the field. After all, there has to be a reason why they would do such a...

I am trying to create an electromagnet that will repel another magnet when activated. Currently, I am using a 12v battery with 7400 mAh. For the coil I am using copper wire of AWG 9 and 12 (I am experimenting with both sizes). I have also tried air and iron cores. However, I have run into a...

electromagnet that plug into wall outlet? I am working on a project for science and and trying to make an electromagnet that will plug in a normal wall outlet (120v ac). I have been searching the internet for a way to do this and have found out very little. I am on a lower budget and want to...

I am working on a project to make a large scale electromagnet and try as I might I just can't get past one part. Getting it to magnetize. I have built the unit primarily out of a 5 ft rod of threaded steel (I will be replacing it with iron I just happened to have the rod already) wrapped in...

So, I'm playing around with electromagnets right now and I was wondering how to calculate (or determine experimentally) the approximate strength of the electromagnet. What I'm doing right now is using the formula for a solenoid, B=\mu_o N i and adding the constant for whatever material is in the...

If you have a bar magnet in a coil and rotate it sideways (poles on the side of the magnet) does it produce an alternating current and do the number of turns in the coil affect this, and if you move a magnet through a coil one way and then the other, does it produce an ac current?

I need a bit of help in constructing 2 small electromagnets with opposite poles for quickly moving a 4 or 8lb pull rare-earth magnet back and forth ~ 3 cm, farther if need be. _______ _______ ________ |e-mag 1|-----|r.e.mag|-----|e-mag 2| ("---" being a rail)...

Hi- I'm a researcher for a TV production company, and I'm trying hammer out a basic idea - perhaps members of this forum could enlighten me a bit, as my science knowledge is a bit weak... How powerful of an electromagnet could I create with an iron manhole cover, wrapped with rather thick...

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...

Air cooled coil electromagnet ? Hi. I'm a (very) Junior researcher I'm trying to biuld a solenoid electromagnet (air bore, not metal), But I need it in a specific size and most important I have to have it AIR COOLED (by fan or compressed air). Does anybody know if such an electromagnet...

Small Simple Electromagnet...Help Please! hi I'm trying to make a simple small electromagnet using a core from electric drill transformer (I think its called permalloy if I'm not mistaken) which i machined into 17mm long and 2mm diameter. How can i make it powerful enough to produce a force of...

Hello All, I am trying to run an electromagnet from my new power supply (TekPower HY3010E - 0-30V @ 0-10A). My electromagnet is a very simple air-core solenoid - 3-layers wound with 8 turns per layer from a 20-ft-long #12-gauge wire. The coil form is not big at all - a simple cardboard...

I am doing a question about Current balances & Electromagnet Induction and i cnat seem to figure out a few thing and i was hoping someone could help me, so here is the question: A conducting bar moves to the right along parallel,frictionless conducting rails connected on one end by a 6.00ohm...

I am designing an electromagnet and need a strong field strength. I have came across a few different ways to wire the coil and am curious which way produces the strongest dipole electromagnet. The coil is to be wound around a cylindrical steel core. The first way is what I think is the most...

Hi, I am fairly new to magnetism and had a few questions regaring the construction of electromagnets. I am trying to build one for a simple application and was hoping for some advice. My application requires a small, preferably short, large-radius cylindrical electromagnet that will act as a...

I've posted on here a few times concerning the electrical problems I continue to encounter for my video installations. And yet, here's another one. If anyone remembers, I posted a month back or so concerning the use of an audio signal from a home audio receiver to open and close a small...

Hello, this is my first post here. I'm building an electromagnet as part of a larger experiment in my lab. My magnet needs to move a magnetic thread made with a paramagnetic substance. This string just barely responds to strong magnetic fields (tested it with standard speaker magnets). The...

I'm not too knowledgeable on electricity, but I'm constructing an electromagnet with aluminum strips as the coil and using a 120 volt household current. Proposing to solder an extension cord to the strip coil. 1. When it is plugged into the outlet, will it automatically send juice through the...

Hello, I am currently planning on constructing an electromagnet. Its purpose is entirely for entertainment. I was hoping to make two of them that I could attach handles and switches to so they could be used for hanging/climbing underneath some random thing. If possible, it would be useful if...

I plan to use two electromagnets (With a magnetic core) to make a magnet move back and forth on a rail. I plan to place the two electromagnets on the both the ends of the rail. The travel length of the magnet is 0.5 inch. Then depending on the direction of movement of the magnet, I plan to...

It would be great if someone is able to answer the following question (if possible) What is electromagnet? How is electromagnet used to generate electricity? What happens during electromagnetism? Advantages and disadvantages of using electromagnets. Future developments in electromagnetism...

hi, as part of a project me and my friends are undertaking we are trying to measure the change in resistance of an electromagnet when a coin is placed near near the electromagnet. i have been trying to use a bridge rectifier to convert the system to DC but i have been encountering a few...

I realize that soft iron is the most common material for this but I am wondering if there is something that will increase the magnetic strength. Here is what I have. Two electromagnetic coils in series connected by a yoke with a capacitor in parallel (for spark reduction). Cores are soft...

Wondering if anyone can give me a clue as to where I might look for information on what the best core material would be for an electromagnet if price were not an issue. I need as much magnetic strength as possible for between 3-9 volts DC. At between 80-160Hz. Basically this is a solenoid...

What is the relationship between voltage and the strength of an electromagnet?

Magnets and electromagnet power? It’s said in the <crackpot link removed - Zz> e-books that high voltage 5000v DC electromagnets are more powerful that low voltage 12V DC electromagnets. And in the permanent magnet motor it’s said that “The Attraction of a magnet ( North ) is always stronger...

Homework Statement I want to design Electromagnet in aluminium strip/wire for pickup 5kg iron piece at distance of 300mm and i try many books to calculate the said magnet but failed. I want to know how i calculate above magnet. Please help Homework Equations The Attempt at a Solution

Hi, I like to research the possibility to build an electromagnet that is quit big and has a lot of strength. As I really don't know much about magnetism, I don't see how to start with this. Anyone that please can help me with some formulas? I like to make a sort of excel or MATLAB...

If a toy electromagent holds 200 lbs on 2 d cells is that overunity? If not could someone explain it without just stating the 2nd law of thermal dynamics. Also if anyone knows the push against and armature in an electric motor compared to the pull of an electromagnet built for lifting...