1
vote
1answer
53 views

Can a solenoid have its magnetic field “focused”?

Imagine a solenoid generating a magnetic field. Can this field be focused so that it exists only in a certain section of that solenoid at a given time. If a typical solenoid looked like: ...
2
votes
3answers
439 views

My DIY solenoid does not work

DESCRIPTION: Hi there, I don't know lot about electricity and I`m having problems with my first solenoid-prototype, I tried to build it watching you tube videos. I have attached the pictures of the ...
1
vote
1answer
76 views

When -EMF is induced can we keep current the same?

I'm confused at how Back EMF or (-V, -EMF) reduces current, and conserving the overall power. Let use the following simple example to help my understanding: A solenoid produces a magnetic field B, it ...
0
votes
1answer
93 views

Powerful electromagnet?

Is it possible to produce over 1000 lb of magnetic force over a distance of 4 inches(0.101 meters), using an electromagnet? How difficult would it be? Explaining the general spec's of such an ...
2
votes
1answer
121 views

AC solenoid valve with DC

I have a 24VAC/60Hz solenoid. I used 12VDC just to try, and it worked good (well needless to say it worked as expected with 24VAC/60Hz). What are the effects of a solenoid that's projected for AC ...
7
votes
3answers
4k views

How to properly wind coils for a solenoid?

I need to wind a small electromagnet "solenoid?". About 3cm high and 2~5cm wide running at 5V/0.5A. This magnet will be put into a desk bell so it pulls the clapper down and rings the bell. I have ...
2
votes
1answer
753 views

How to determine the force of a solenoid based on inductance

I'm looking to potentially build my own small solenoids, I thought perhaps that I could take an Air core inductor, a spring, piece of plastic, and conductive core and build my own. Is there a way to ...
19
votes
3answers
2k views

Why aren't solenoid/electromagnet windings insulated?

This has been bugging me for a long time. Take this video for example. I have always thought that electricity will take the shortest path. When the electromagnet's windings are uninsulated, it seems ...
1
vote
2answers
2k views

Solenoid Alternative?

I wanted to use solenoids in previous projects and have been let down by the fact that I can't find them here in Egypt. Plus they are a bit expensive. My question is: is there an alternative that it ...