Questions tagged [electromagnet]
The electromagnet tag has no usage guidance.
96 questions
0
votes
1
answer
30
views
How will the force v/s Distance Plot look like for this electromagnet and iron piece pair [duplicate]
Given an electromagnet and iron piece pair with the initial setup as below. Assume that the electromagnet is fixed and the iron piece and move only in vertical direction (lets assume that it is fixed ...
- 135
1
vote
2
answers
88
views
Why does the instantaneous force decrease in this electromagnet and iron piece setup?
This is related to a previous question In which direction does the iron piece experience force in this electromagnet setup?
Given an Initial Setup of a fixed electromagnet and a vertically movable ...
- 135
2
votes
2
answers
169
views
In which direction does the iron piece experience force in this electromagnet setup?
Given a U shaped electromagnet and an iron piece setup as shown below:
We can assume the electromagnet is fixed.
When the electromagnet is energized, in which direction will the iron piece experience ...
- 135
0
votes
1
answer
69
views
Electromagnet with ESP32 and MOSFET
I got this circuit that should drive electromagnet from ESP32 using 1RLZ44N MOSFET. I do think I got it correct but would appreciate feedback. I am a little bit uncertain on the placement of the 10 kΩ ...
- 203
0
votes
1
answer
41
views
How to implement variable electromagnet control?
I'm planning to build a small model engine dynamometer, of the eddy current type. Basically the engine spins a metal disk, and the stator contains some electromagnets, which will induce a current on ...
0
votes
2
answers
68
views
Electromagnet/Solenoid affect on other hardware
I plan on using an electromagnet or a solenoid to attach a brace to a robot. These would be either two of the 5V Electromagnet - 25 Kg Holding Force electromagnets or two LEDEX B4HD-254-M-36 solenoids....
2
votes
2
answers
167
views
Problem with H-bridge circuit inverting power to electromagnet. The transistors are burning up, but I don't see the problem
Background:
I am using an H-bridge configuration (w/ flyback circuit) to invert the power to an electromagnet.
I made the system with all NMOS transistors (Q1-Q4). It is running at a max of 300 A @ 30 ...
-1
votes
2
answers
67
views
How would super high voltage and high amperage affect the number of windings in an electromagnet?
If you use a high resistivity material (either being due to small cross section of wires or poor conductivity of material), you could increase the voltage to kilovolts proportionally to the resistance,...
- 122
0
votes
1
answer
43
views
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 ...
0
votes
1
answer
72
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?
- 21
0
votes
1
answer
36
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 ...
- 105
0
votes
2
answers
86
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 ...
0
votes
1
answer
51
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 ...
- 151
0
votes
1
answer
41
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 ...
- 31
1
vote
1
answer
179
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/...
- 13
2
votes
0
answers
88
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 ...
- 141
0
votes
2
answers
111
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 ...
- 53
1
vote
1
answer
165
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) ...
- 189
1
vote
2
answers
226
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 ...
- 113
0
votes
1
answer
93
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 ...
- 41
1
vote
0
answers
66
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 ...
- 11
0
votes
0
answers
57
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?
- 13
1
vote
1
answer
79
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 ...
- 127
0
votes
2
answers
214
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, ...
0
votes
1
answer
85
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 ...
3
votes
3
answers
108
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 ...
- 31
2
votes
2
answers
336
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 ...
- 21
1
vote
1
answer
151
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?
- 13
-3
votes
2
answers
128
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 ...
- 1
0
votes
0
answers
143
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 ...
- 1
0
votes
1
answer
140
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 ...
- 101
1
vote
1
answer
62
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 ...
- 122
1
vote
1
answer
219
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 ...
- 69
0
votes
2
answers
162
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), ...
- 69
0
votes
2
answers
270
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 ...
- 111
1
vote
2
answers
699
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 ...
- 13.1k
8
votes
5
answers
9k
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 ...
- 99
0
votes
0
answers
46
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?
- 1
0
votes
0
answers
133
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/...
- 211
1
vote
0
answers
56
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-...
2
votes
1
answer
112
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 ...
1
vote
2
answers
266
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?
- 11
0
votes
1
answer
271
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 ...
- 269
1
vote
1
answer
89
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 ...
- 11
1
vote
0
answers
534
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) (...
- 269
1
vote
1
answer
343
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 ...
- 11
-1
votes
1
answer
133
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 ...
- 121
0
votes
1
answer
323
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 ...
0
votes
3
answers
4k
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 ...
-3
votes
2
answers
451
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 ...
- 11