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Swinging Magnetic Attracted to Batteries [closed]

I have a pendulum in which the Bob is a permanent magnet. The circuit and batteries are hidden inside the base. The problem is that the permanent magnet is attracted to the batteries and slows the ...
Wylie Wisnewski's user avatar
0 votes
1 answer
71 views

What is the max voltage I can apply to an electromagnet? [closed]

I have a small Amazon Electromagnet 4 ohms of resistance and wound with 110 feet of 28 AWG lacquered wire. What is the maximum sustained voltage I can put through it?
Collins's user avatar
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1 answer
32 views

How to prevent power fluctuations on strong Electromagnetic Lock (2A)?

I'm learning how to control strong Electromagnet Lock using ESP32 microcontroller, but I'm having problems with board freezing at the end of relay activation. So the Lock works, but then the board ...
madneon's user avatar
  • 105
0 votes
2 answers
58 views

How can I use a relay and diodes to reverse the polarity to a electromagnet?

I am trying to make a solenoid using a motor, relay, and 12-volt battery. I have everything working, but it only goes one way. I want it to reverse the polarity when the relay is open. Will it work if ...
Seymour Butz's user avatar
0 votes
1 answer
46 views

Where does the electricity in electromagnets come from if permanent magnets from generators decrease their magnetic strength?

The question has been puzzling me for some time, I presume electrical power starts from generators, the heat produced by them(generators) cause their magnets to weaken and electromagnets have to be ...
kopon stanley's user avatar
0 votes
1 answer
37 views

Phase shifting 2 waveforms to create a rotating magnetic field

I'm trying to set up a rotating magnetic field with 4 electromagnets coils (2 pairs) arranged around a fluidic cell. I have read that you need to shift the 2 waveforms out of phase by 90 degrees to ...
LeviB's user avatar
  • 31
1 vote
1 answer
92 views

How to improve my son's solar bobble head [closed]

My son has a minecraft solar bobble head (in this case a bobble Steve). Under light it swings a diamond sword this exact one (Puckator Officially Licensed Minecraft Steve Solar Pal https://amzn.eu/d/...
Jordan's user avatar
  • 13
2 votes
0 answers
79 views

Designing a polarity-reversing electromagnet with energy recovery

I'm looking to design an electromagnet that changes its polarity by the trigger of a pulse signal, by considering the lowest energy drop, I am looking for a sub-system to reserve the energy of the ...
Hamza Hajeir's user avatar
0 votes
2 answers
91 views

Charging and discharging electro-magnet

I was using normal MOSFET to turn a 1.2 H+4.8 Ω electro magnet at 48 V and draw around 10 A. The MOSFETs are getting damaged after a few days. The MOSFET is just used as a switch (no continuous ...
Jim's user avatar
  • 51
1 vote
1 answer
112 views

Finding the ideal parameters for a homemade electromagnet

I am making an electromagnet and I was watching some videos on designing one. I just have some misunderstanding about power calculations of electromagnets and I have some questions about it. Q1) 1.1) ...
zoghii's user avatar
  • 177
1 vote
2 answers
205 views

How is the holding force of this electromagnet so large?

I am designing a system that uses the magnetic force to fix an object in its place. I plan to connect an I-core to my object and fix it to a fixed C-core by letting a magnetic flux flow through both ...
Arad's user avatar
  • 91
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1 answer
85 views

Electromagnet doesn’t have power [closed]

I have so problem with an electro magnet, I mean it seems a little weak to me. What could I do to improve it’s power? Battery: 3.7V 8800mAh Also, I had the wires in small parts so that’s the reason ...
Gabriel Stan's user avatar
1 vote
0 answers
56 views

Mixing power supplies with inductive loads

I have two unregulated power supply - 24V and 12V. My board consists of digital components and sensors that require 3.3V or 5V. All that electronics is resposible for electromagnets or DC brush motors ...
pajur97's user avatar
  • 11
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0 answers
56 views

Magnetic Field Produced By Electromagnet Perpendicular Winding

If I wound wire like a cylinder (blue) and then continued in a perpendicular direction like a toroid (yellow), what would the magnetic field look like?
br4n_d0n's user avatar
1 vote
1 answer
65 views

Wrong orientation of a diode destroy a circuit (Schematic included)

I get 24V from the barrel jack. The electromagnet is controlled using PWM. Here, I made a mistake and the diode direction is reversed. (The diode is placed to protect from back EMF.) When I plugged ...
thankyounaly's user avatar
0 votes
2 answers
171 views

Do superconducting electromagnets require less energy than resistive type electromagnets to create the same strength of magnetic field?

Do we require less power in the superconducting (cryogenically Cooled) electromagnet than the resistive type electromagnet? If you have any figures or the voltage and current graph for both magnets, ...
Smit Fefar's user avatar
0 votes
1 answer
80 views

How do I create an AC electromagnet for a particular type of field generator?

I’m trying to generate a special sort of field in a spherical spinning iron core using two orthogonally oriented coils. One single-layer coil of 18 AWG magnet wire is wrapped directly onto most of the ...
magnetwhisperer's user avatar
3 votes
3 answers
106 views

How can I control five hundred 250 mA electromagnets with shift registers and MOSFETs at the same time?

At the moment I control 16 electromagnets. I will later daisy chain the shift register control boards to control 500 electromagnets 250 mA each at 24 V (could be 12 V) with shift registers and MOSFETs ...
Mastalyn's user avatar
2 votes
2 answers
244 views

H-Bridge Circuit w/ Inductor Demagnetization

I'm building an H-bridge circuit designed to send a pulse through an electromagnet, and then rapidly collapse the field of the electromagnet coil as soon as the transistors switch off. Minimizing the ...
Flywheel's user avatar
1 vote
1 answer
121 views

Can a solenoid be made of copper strips?

Could a coil of copper strips instead of copper wires be used as a solenoid? Are there any real world examples of making solenoids out of strips of copper?
David johns's user avatar
-3 votes
2 answers
121 views

How do we maximize core and winding losses in an electromagnet (and calculate them) for variable DC input?

Bigger Picture: Imagine a magnet approaching the solenoid with some initial constant velocity on \$v_0\$ on x axis. The approaching magnet will induce an EMF and induced current in solenoid. We want ...
student0's user avatar
0 votes
0 answers
122 views

Grid of electromagnets influencing eachother

I'm trying to create a grid of electromagnets to move around some iron filings on a piece of paper. I made a prototype with a 3x3 grid made of some nails and enamaled wire, and but I've found that ...
Cccel's user avatar
  • 1
0 votes
1 answer
120 views

12 V, 7 Ah equivalent transformer

I am trying to power a maglock. The specs say its current draw is 12 V, 500 mA. It works fine when powered by a 12V battery (Mighty Max ML7-12). However, it doesn't work when powered by a 12 VDC, 2A ...
btt's user avatar
  • 101
1 vote
0 answers
135 views

How powerful would be a Bitter configuration electromagnet made of aluminium foil?

The specs: The electromagnet has 7,2 cm of height, 1 cm of radius. A hole with 2,5 mm of radius in the middle. An aluminium foil has 0,024 mm of height so I assumed the insulator layer has the same ...
Fulano's user avatar
  • 370
1 vote
1 answer
58 views

Can laser-induced graphene wires produce electromagnetic fields if a current is passed through them?

For those who don't know, laser-induced graphene (LIG) is a porous type of graphene that appears after exposing certain types of carbon-based materials with a laser. In this video, they made LIG on ...
Fulano's user avatar
  • 370
1 vote
1 answer
175 views

Filtering peaks of a H-bridge driving an electromagnet?

I'm driving an electromagnet (56.5Ω, 59mH) with an H-bridge composed by N-Type MOSFETs (SiHFR120) and half-bridge drivers (2EDL05I06PF). VDD is 80V. Everything works fine excepting the huge current ...
wellknow's user avatar
0 votes
2 answers
156 views

Proper way to switch 80 VDC for continous high current operation?

I'm designing a circuit to change current direction for an electromagnet (57 Ω, 76.2 mH) which I drive with 80 V. I have been using an H-bridge but due to the long on-state period (several seconds), ...
wellknow's user avatar
0 votes
2 answers
240 views

Control 12V relay by using Arduino [closed]

I have an Arduino Mega, 12V relay module, and 12V external power supply. I want to control relay state (on/off) by using Arduino I/O pins (5V). Is it good idea to use following simple diagram? There ...
vito's user avatar
  • 111
1 vote
2 answers
584 views

Snubber circuit for electromagnet

I have run into the same problem described here and here, when I added diode to electromagnet. Basically, the magnet still holds with about 20kg force several minutes after removing power. The ...
Maple's user avatar
  • 12.8k
8 votes
5 answers
7k views

How do I build an electromagnet?

I want to make an electromagnet that can lift a paper clip off of the ground from a short distance (probably 7 to 8 inches). I naively thought of making an electromagnet as a simple task (because of ...
Will's user avatar
  • 99
0 votes
0 answers
35 views

Briefly Drive Permanent Electromagnet [duplicate]

I need to drive a 12VDC/1.2A permanent Electromagnet for 2 seconds (to release object). Will the attached circuit be able to do that or do I need something else? Thank you https://i.sstatic.net/Npy3w....
kevers's user avatar
  • 1
0 votes
0 answers
113 views

Possibility of achieving magnetic levitation(Arduino) with just one solenoid and a ring magnet?

I am currently working on a magnetic levitation project and have been looking into all types of magnetic levitation. One particular video I found around the subject was this: https://www.youtube.com/...
Thanos's user avatar
  • 211
1 vote
0 answers
55 views

What are the components I would need for an electromagnet with the given specifications?

I need to make an electromagnet that exerts at least 5 times its own weight on a ferromagnetic material kept 0.03 m away. I know that: F = [(number of turns × current)2 × magnetic constant(4 × pi × 10-...
Sreenandan Balasubramaniam's user avatar
2 votes
1 answer
109 views

How do I make an electromagnet that weighs less than 2 kg but can exert a force of at least 420 N

For a project that I am doing currently I will need an electromagnet whose total weight is less than 2kg, but can exert a force of at least 420 N on a ferromagnetic material 0.03 m (3 cm) away from ...
Sreenandan Balasubramaniam's user avatar
1 vote
2 answers
227 views

Is there any effect on efficiency of electromagnet if winding wire cross each other during winding?

While winding a core of the transformer some turns cross other turns. Will this affect the magnetization produced by the core?
Shivam Kumar's user avatar
0 votes
1 answer
240 views

Determine inductance of large inductor

I asked a similar question before but i am still struggling with this problem. I am trying to measure the inductance of a large (34cm diameter) electromagnetic brake. Important findings to keep in ...
Rens's user avatar
  • 259
1 vote
1 answer
87 views

Why don't Li-pol accumulators change the polarity of an electromagnet?

I made a simple electromagnet with a screw and a wire. When I supply power to it via 1 AA battery (1.5v) and change + and - contacts it acts differently with other magnets (attracts and repels), but ...
DSP_engineer's user avatar
1 vote
0 answers
476 views

Determine electromagnet inductance

I am trying to measure the inductance of a large electromagnetic brake (coil diameter 34cm). I used two methods: LCR meter (100Hz because the brake is activated using a rectified 50Hz AC voltage) (...
Rens's user avatar
  • 259
1 vote
1 answer
329 views

Determining an industrial electromagnet coil's number of turns and wire diameter, etc

I'm a new graduate and fresh hired Electrical Engineer who works in a company building magnetic separators for general industry (including mining, recycling etc.) Normally, we build magnetic ...
Mert Ünlüsoy's user avatar
-1 votes
1 answer
123 views

Preventing a circuit from blowback voltage from an electromagnetic coil [duplicate]

I've connected up the coil of a relay to a transistor, which is in turn connected to an Arduino Nano. The circuit is a timed relay switching circuit. I know that when the current to an electromagnet ...
Mario Gianota's user avatar
0 votes
1 answer
306 views

How does this electromagnet control circuit work?

I am reverse engineering an electromagnet control circuit in isolation (I do not have the original controls or wiring diagram). I believe applying 12VDC should trigger the respective magnets, but it ...
ElectronNovice's user avatar
0 votes
3 answers
3k views

Ideal dimensions for an electromagnet?

I've been working on a design for an electromagnet. I've exprimented various lengths of core, and figured the height of the windings for 6 different gauges of magnet wire based on the maximum current ...
Brandon Thompson's user avatar
-3 votes
2 answers
400 views

What maximum DC current and maximum voltage can I flow through an inductor?

I have built a toroidal inductor by wrapping an insulated copper wire over a toroidal laminated soft-iron core. The dimensions of core and copper wire are as below: Toroidal core: Inner diameter = 20 ...
Shivam Kumar's user avatar
0 votes
0 answers
66 views

Problem with Amp Turn calculations for electromagnet

I'm attempting to design an electromagnet, and the equations seemed to produce an nonsensical result. The electromagnet needs to impart 42.75 newtons at 0.0015875 meters. I needed to discern the Amp ...
Brandon Thompson's user avatar
1 vote
3 answers
2k views

Powering an electromagnet

I need an electromagnet so I made one out of an old microwave transformer. (something like this: https://www.instructables.com/Microwave-Electromagnet/) To power this electromagnet I have a DC power ...
Mitchell M's user avatar
0 votes
1 answer
91 views

Turning a transformer into an electromagnet [closed]

I saw in a YouTube video that people turned a transformer into an electromagnet by rearranging the T-shaped metal. When I did the same and plugged it into the AC supply, it gets too hot. I tried ...
Akash's user avatar
  • 9
0 votes
2 answers
2k views

Ferrite core in electromagnets

I have a small project based around designing a small home-made DC actuator using a small DC electromagnet. My final goal is to generate the strongest magnetic field possible with the minimum amount ...
tampler's user avatar
  • 97
1 vote
0 answers
54 views

Solenoid Train - Best approach for magnetically guiding an object along a path?

My project is to pull an object along a path with solenoids, by cycling their on/off state. I don't know if ferrous core solenoids pulling steel would be more efficient than pulling a neodymium ...
Scott's user avatar
  • 11
0 votes
1 answer
235 views

Will a regular neodymium magnet attract an electromagnet not currently being supplied with power?

I have a setup for one of my robotics projects where a neodymium magnet is placed across from an electromagnet. I power the magnet with DC through a L298N motor controller that is connected to an ...
Cousin Ale's user avatar
0 votes
2 answers
84 views

Does electric resistance of an iron-cored electromagnet depend upon the size and type of the core?

I know that the resistance of an electromagnet depends upon the nature, length, and diameter of the wire. Is it also depend upon the size and nature of the iron core on which the wire is wrapped?
Shivam Kumar's user avatar