×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Microwave transformer electromagnet questions..

Microwave transformer electromagnet questions..

Microwave transformer electromagnet questions..

(OP)
Hi Guys, Sorry I'm a noob and know next to nothing about electromagnet theory and construction. sadeyes

I am tasked with constructing a device that can be towed along a dirt road to pick up railway dog spikes (approx 115mm X 15mm X 15mm steel weighing up to 150 grams)

I have a plan in mind for microwave transformers with the secondary coil removed attached to a @1000mm square plate then the plate insulated from the trailer.

Will multiple electromagnets work attached to the same plate?
What is the ideal voltage? I see lots of YouTube vids with anything from an AA pencil battery to a 12V car battery.


Jas.

RE: Microwave transformer electromagnet questions..

Huh?? What is a "microwave" transformer? From your description of the job you need a regular metal detector, or several side by side (but not too close to each other) to cover a wider sweep in one go.

RE: Microwave transformer electromagnet questions..

(OP)
By "microwave transformer" I mean the transformer out of a household microwave oven.

A metal detector won't pick anything up from the ground as I need this device to do.

RE: Microwave transformer electromagnet questions..

Ok, language ambiguity: by "pick up" you mean literally, not meaning "detect" the presence of the spikes! In that case using a mains "transformer with the secondary coil removed" won't produce the sort of magnetic flux you would need in the large metal plate. This is because the magnetic circuit is still local to the transformer.

Transformers use 'E' and 'I' shaped soft iron interleaved laminations; you would have to separate these to fit only the E sections through the coil bobbin to get any magnetic flux outside the transformer. But all this is likely to do is attract the metal plate. Most of the flux will be contained in the plate: to produce an external field beyond the plate you need to have a gap in the plate, e.g. two smaller plates extending the transfomer laminations (think of the poles of a horse shoe magnet) I suggest you look at the electro-magnetic grab crane pickup used by auto wrecking yards!

RE: Microwave transformer electromagnet questions..

Kudos to your BrianG for deciphering that. I'd written the OP off as a loony, not realising it was just an ambiguous word choice! Now it makes sense.

RE: Microwave transformer electromagnet questions..

(OP)
BrianG: I have no need for a detector. I can see the spikes on the ground. All I need to do is construct some sort of apparatus to collect them.
USA and Australia almost speak the same language, I'm surprised you didn't think I meant a pickup truck.
I thought an electromagnet setup would be easy enough but unfortunately it isn't my field of expertise.

Liteyear: Loony huh?

RE: Microwave transformer electromagnet questions..

magnetic sweepers are commonly used and cheap

based on permanent magnets in side a roller, there are other designs suitable for highway cleaning

RE: Microwave transformer electromagnet questions..

(OP)
VE1BLL: Thankyou for the link.
One of those sweepers looks much simpler and easier than powered magnets.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close