Questions tagged [electromagnet]
The electromagnet tag has no usage guidance.
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Electromagnet doesn’t have power
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 ...
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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 ...
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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?
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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?
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How can I switch polarity for high power device?
I have a power supply that can deliver from 0 to 1400W (100V - 14A) to an electromagnet. I want to be able to switch the polarity with an electrical signal. I cannot use mechanical relays because it ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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), ...
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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 ...
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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 ...
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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 ...
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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.stack.imgur.com/...
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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/...
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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-...
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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 ...
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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?
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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 ...
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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 ...
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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) (...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Powering an electromagnet
I'm a first time question asker...
So here's the problem:
I need an electromagnet so I made one out of an old microwave transformer. (something like this: https://www.instructables.com/Microwave-...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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Reducing Residual Magnetism in Electromagnets
My issue is that after the electromagnet has been switched off, the magnet and the test steel C45 object attracted to it remain attached.
The residual force appears minimal, as no object which was not ...
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How many volts is needed to power a coil
I recently encountered and was trying to troubleshoot a device that's not working properly. In tracing the functionally of the device, I isolated the issue with a coil that does not activate.
...
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Electromagnet with a pipe as the core
I have heard that applying a strong magnetic field to diesel fuel can positively affect the filtering out of microbial contamination. Assuming that is true:
I thought it would be simple to wrap a ...
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Help with homemade electromagnet
Just for fun, I decided to build what I was hoping would be a relatively powerful electromagnet. I used this copper wire (20 AWG, entire 1 pound spool) and this soft iron core (0.5 in diameter, 6 in ...
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PWM driven MOSFET to power a coil
I need to power a coil (electromagnet to be precise) using a PWM singal generated by an arduino or a 555 timer.
I can esily power the coil when the PWM signal is in the HIGH (5v) state using a simple ...
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Electromagnets and voltage
I'm thinking of getting two electromagnets. On Amazon, it reads 24V 400N. What does that mean? Of course, it would be DC since that is what electromagnets are based on. I will use a simple series ...
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MOSFET Drain - Source Current limiting
I am a new enthusiast to MOSFETS. I am trying to use a MOSFET to switch on and off a electromagnet that draws 5 amps at 1.2 volts using an Arduino. The circuit I am using has a diode going from the ...
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Solenoid : how dimensions ratio affects the magnetic field?
For a constant length of copper wire (with constant diameter), how can I calculate the most efficient solenoid diameter/length ratio ?
(i.e. what ratio produces the strongest magnetic field, if the ...
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How to design a solenoid.?
I want to design a DC solenoid valve that could compress a spring under 5 kg of load. All I know is the voltage (12V), load (5kg), the current range (15-20), and the cross-sectional area of the ...
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Use DC Motor driver for electromagnet
I need to control the force exerted by an electromagnet using an MCU. it's not a commercial item so I don't have any datasheet.
Here what I know:
resistance: 8,9 ohm
may be powered up to 60V (with ...
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