All Questions
22
questions
7
votes
1
answer
212
views
Equation for the force created by a solenoid
I'm trying to make an electro-magnet and I want to figure out what core and wire I need using math instead of trial-and-error.
I want it to produce ~1.5 newtons of force at ~1.5 inches from the magnet....
- 173
2
votes
2
answers
156
views
Does winding a solenoid around a copper pipe reduce the net magnetic flux at all?
I want to wind an air core solenoid around a copper tube. One end of the solenoid is soldered to the copper tube. (See picture above). Will a magnetic field be induced in the copper tube that cancels ...
- 593
3
votes
1
answer
585
views
How can the magnetic field produced by the shading ring of a solenoid valve be 90° out of phase compared to the coil magnetic field?
I am trying to understand how the shading ring in solenoid valves is able to produce a 90° out phase magnetic field compared to the coil's magnetic field. The logic seems different from a shaded pole ...
- 31
0
votes
0
answers
116
views
How do we calculate the cross section area and EMF in a solenoid?
Case 1: Consider an air core solenoid \$S_0\$ with inner diameter \$(d_{in0})\$ = 10 cm and the cross section area of the wire = 0.1 cm, outer dia \$(d_{out0})\$ = 10.1 cm. The number of turns in the ...
- 1
2
votes
1
answer
81
views
DIY fixed voltage solenoid inductor -- do more loops actually make the B field stronger?
I'm building a custom electromagnet. Given the fixed voltage, I'm wondering if there's actually a benefit to putting more wire loop layers in my solenoid given the trade-off of increased resistance/ ...
0
votes
2
answers
174
views
Calculating audio amp output impedance and other general questions [closed]
I'm 3rd year EE student and I am now doing a project where I'm basically making a supersensitive metal detector using solenoids. Solenoid has about 9 ohm resistance with inductance about 13 mH. ...
- 1
-1
votes
2
answers
52
views
Creating AC magnetic field with DAQ card [closed]
I'm a second year student in electrical engineering. For my project, I am working with magnetic nanoparticles and I need to set up an AC magnetic field.
My plan is to build a solenoid (~1200 turns, 10 ...
- 19
0
votes
1
answer
158
views
Electromagnet force and magnetic permeability
In a cylindrical core electromagnet,
Magneto-motive force (MMF) = 613 At
Magnetic strength (H) = 15345 At/m
I am using an iron core with 10% silicon in it, so the saturation magnetic flux density of ...
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 ...
- 11
1
vote
0
answers
102
views
Designing an electromagnet
I'm new to magnetics and apologize in advance if any of these questions are too basic. I'm looking to build an electromagnet array to move around an object placed on top of the array. Something ...
1
vote
1
answer
251
views
measuring ac voltage drop across a resistor with a solenoid in series with it
I wanted to measure the phase difference between the current (magnetic field due to the solenoid) and the system response. I am doing this by measuring the voltage drop across the resistor in series ...
- 37
-1
votes
2
answers
728
views
Shape of a core for use in a solenoid
I am currently designing an electromagnetic accelerator meant to accelerate a spherical nickel-plated NdFeB (neodymium) projectile along a circular tube, in a similar manner to a particle accelerator. ...
2
votes
2
answers
3k
views
Increase the pulling force of a solenoid with a permanent magnet [duplicate]
I have a number of solenoids I would like to use in a project. The problem is that they're not quite powerful enough so I've been trying to come up with ways to increase the their pulling force ...
- 145
0
votes
1
answer
838
views
Two solenoid coils and ferrite rod, how to calculate mutual inductance or coupling co-eff
I have two solenoid coils, one is wounded on ferrite rod and other is wounded in larger diameter in proxmity of ferrite rod, see picture. It is used as wireless comm (simplex) between RX and TX where ...
- 158
3
votes
2
answers
547
views
why is the outside of an electromagnet not magnetic?
On the electromagnet (5 Volts DC, built upon a transformer core) setup pictured below , only the core part is magnetic (when powered, it attracts a piece of steel) but not the 2 "wings" outside that ...
- 249