CR4® - The Engineer's Place for News and Discussion®


Previous in Forum: Low Capacitance Coupling in Mains Step-Down Transformers   Next in Forum: Help Me With This!
Close
Close
Close
26 comments
Member

Join Date: Jan 2017
Posts: 6

Billy D Willoughby

01/28/2017 5:35 PM

I am an inventor, trying to find out if Eddie Currents, have ever been used to generate
electricity, in any way.

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19144
Good Answers: 341
#1

Re: Billy D Willoughby

01/28/2017 5:42 PM

You mean Eddy currents,

no, at least not intentionally. I believe eddy currents are generated for things like NDT and the like. And not vice versa, it sounds more like a waste.

__________________
phoenix911
Register to Reply
Guru

Join Date: Apr 2010
Posts: 5812
Good Answers: 589
#5
In reply to #1

Re: Billy D Willoughby

01/28/2017 6:11 PM
Register to Reply Score 1 for Good Answer
Member

Join Date: Jan 2017
Posts: 6
#7
In reply to #1

Re: Billy D Willoughby

01/28/2017 7:47 PM

Thank you for replying, phoenix911. Do you believe, anything new could ever be invented, using eddy currents?

Register to Reply
Guru

Join Date: Dec 2016
Posts: 2914
Good Answers: 115
#2

Re: Billy D Willoughby

01/28/2017 5:44 PM
Register to Reply
Member

Join Date: Jan 2017
Posts: 6
#8
In reply to #2

Re: Billy D Willoughby

01/28/2017 7:56 PM

Thank you Andrew for replying, I think you are saying no to my question.
I am aware of the things, you are talking about.

Register to Reply
2
Guru

Join Date: Dec 2016
Posts: 2914
Good Answers: 115
#10
In reply to #8

Re: Billy D Willoughby

01/28/2017 8:26 PM

"if Eddie Currents, have ever been used to generate

electricity, in any way."

My answer remains "Yes, they have."

Thing is, in all cases, the part in which the eddy current is produced is also its consumer.

Let's take a well-known example of eddy current in action: a magnet falling through a copper pipe:

Now, what if we slit that copper pipe on one side along its entire length and bridge the gap with a resistor. Is it still an eddy current or is it now the current flowing through the 1-turn coil of a generator?

Eddy currents are currents which are localised in the bulk; that is, they don't leave it. When you morph that bulk into a wire, wind that wire into a coil, expose it to a varying magnetic field, and connect the coil to a load, is it still considered an eddy current? Why not? Everything is still there that was there before, yes?

Register to Reply Good Answer (Score 2)
Guru

Join Date: Dec 2016
Posts: 2914
Good Answers: 115
#11
In reply to #10

Re: Billy D Willoughby

01/28/2017 9:01 PM

Topologically (because of the hole) that pipe could be considered a one-turn coil. How about a copper plate against whose centre we have one end of an electromagnet plugged into an AC source, thereby inducing an AC eddy current to flow in the plate:

What if we slit the plate halfway to its centre and bridge the gap with a superconductor? Is the plate now a one-turn transformer secondary?

As we increase the resistance, what happens to the current flow? Does part of it turn back into an eddy current flowing in the plate around the slit?

What if the resistance is infinite? Is the current flow entirely an eddy current, albeit considerably reduced? Yes. Eddy currents don't leave the bulk. They're localised.

Register to Reply
Member

Join Date: Jan 2017
Posts: 6
#12
In reply to #11

Re: Billy D Willoughby

01/28/2017 10:29 PM

Prof. Westman, your credentials are impeccable. you have proved my point, even though you don't know it. Thank you for the answer.

In a few weeks, I would like to show you results, of this conversation. If you don't mind.
thank you for taking the time, to help me.
Billy Willoughby

Register to Reply
Guru

Join Date: Dec 2016
Posts: 2914
Good Answers: 115
#13
In reply to #12

Re: Billy D Willoughby

01/28/2017 10:40 PM

I'd be delighted.

Register to Reply Score 1 for Good Answer
Guru

Join Date: Apr 2008
Location: Chicago
Posts: 2296
Good Answers: 73
#14
In reply to #11

Re: Billy D Willoughby

01/28/2017 10:45 PM

Not that I'm one to correct grammar by any means, but I looked into it a little. I believe you mean that the copper pipe is the topological equivalent to a one turn coil?. Not that it could be considered a one turn coil.

as for an eddy current generator?

I think the OP should contact you and make you and exclusive partner.

Slit plate copper superconducting eddy current generators in every home.

__________________
High Tolerance is Beautiful
Register to Reply
Guru

Join Date: Dec 2016
Posts: 2914
Good Answers: 115
#15
In reply to #14

Re: Billy D Willoughby

01/28/2017 10:55 PM

"Not that it could be considered a one turn coil."

Why not? What makes it fundamentally different than a single shorted turn made from ordinary wire? Because it's thick? Because it's long? Does it function any differently than a shorted single-turn coil in any respect whatsoever?

Register to Reply
Guru

Join Date: Apr 2008
Location: Chicago
Posts: 2296
Good Answers: 73
#16
In reply to #15

Re: Billy D Willoughby

01/29/2017 7:53 AM

A shorted one turn coil is operationally speaking... A paperweight. Or door stop. Depending on size. And would exhibit the same operational characteristics.

Topologically speaking the coil, pipe, and a doorframe are equals. That was my only piont.

__________________
High Tolerance is Beautiful
Register to Reply Score 1 for Off Topic
Anonymous Poster #1
#3

Re: Billy D Willoughby

01/28/2017 6:00 PM

If Fast Eddie Filson doesn't know, ask Minnesota Fats.

Register to Reply Score 2 for Off Topic
Guru

Join Date: Oct 2008
Posts: 40058
Good Answers: 1598
#4

Re: Billy D Willoughby

01/28/2017 6:09 PM

Welcome.

I tried to look at tripleeeepowersource.com but couldn't get toit.

I don't tweet, where can we look at your inventions?

Register to Reply
Member

Join Date: Jan 2017
Posts: 6
#9
In reply to #4

Re: Billy D Willoughby

01/28/2017 8:11 PM

Thanks for replying Lyn, I am trying to find the answer, to one last question.
I will reply to you, when all the legal work is done. Thanks again.

Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19474
Good Answers: 1141
#6

Re: Billy D Willoughby

01/28/2017 6:35 PM

An eddy current is by definition a closed loop, eddy means circular....If you're talking about magnetically induced current flow in a conductor, that's the definition of a generator....If you used an eddy current to induce electricity you would create an inefficient parasitic load on the power source....In other words, there's no free ride.....

Here's some good reading for info...

http://web.mit.edu/viz/EM/visualizations/coursenotes/modules/guide10.pdf

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 4597
Good Answers: 168
#17

Re: Billy D Willoughby

01/29/2017 10:34 PM

Prior to the advent of the "Smart Meter", virtually all (at least all that I was aware of) permanently installed kWh meters ("Light meters") used eddy currents to propel the rotating disk. Thus this disk was an electric motor. Electric motors need electricity to run, and that electricity came from eddy currents, so I'd say the answer is Yes.

__________________
Teaching is a great experience, but there is no better teacher than experience.
Register to Reply Score 1 for Good Answer
Guru

Join Date: May 2016
Posts: 922
Good Answers: 44
#18

Re: Billy D Willoughby

01/30/2017 10:14 AM

I have Wilton bench grinder that uses a pickup coil near the armature that powers the grinder work light. As the grinder spins up, the work light gets brighter. Initially it surprised me that they would not just put the work light in a 120v parallel circuit with the grinder.

Register to Reply Score 1 for Good Answer
Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 4597
Good Answers: 168
#19
In reply to #18

Re: Billy D Willoughby

01/30/2017 12:06 PM

That is indeed interesting. Small 120 V incandescent lamps have very weak filaments, that don't handle vibration well, so using a much lower voltage lamp will make it last much longer.

That pickup coil is just a generator, or could be considered the secondary of a transformer. It is NOT an example of eddy currents. See AW's post #10.

__________________
Teaching is a great experience, but there is no better teacher than experience.
Register to Reply
Guru

Join Date: May 2016
Posts: 922
Good Answers: 44
#20
In reply to #19

Re: Billy D Willoughby

01/30/2017 1:52 PM

This light doesn't turn on when the switch is turned on. It brightens only as the grinding wheel speed comes up.

Register to Reply Score 2 for Off Topic
Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 4597
Good Answers: 168
#21
In reply to #20

Re: Billy D Willoughby

01/30/2017 2:37 PM

Yep! That shows that it is essentially a generator, using the magnetic fields of the rotating armature as the energy source.

There are always various ways of understanding things. The spinning armature can also be considered the primary of a transformer, with that coil being the secondary.

__________________
Teaching is a great experience, but there is no better teacher than experience.
Register to Reply Score 1 for Good Answer
Guru

Join Date: May 2016
Posts: 922
Good Answers: 44
#22
In reply to #21

Re: Billy D Willoughby

01/30/2017 3:13 PM

Rotary core transformer. Got it.

Register to Reply
Member

Join Date: Jan 2017
Posts: 6
#23
In reply to #21

Re: Billy D Willoughby

01/30/2017 6:33 PM

Thank you, dkwarner You are seriously help me understand, what I'm trying to do

Register to Reply
Guru

Join Date: May 2006
Location: Placerville, CA (38° 45N, 120° 47'W)
Posts: 4597
Good Answers: 168
#24
In reply to #23

Re: Billy D Willoughby

01/30/2017 7:12 PM

You're quite welcome!

If you are an inventor, then you need to become proficient in patent searching. For example, it took me about one minute to find this.

Note that I agree with Andrew Westman, that if the current leaves the conductor in which it was generated, it is no longer an eddy current. (Look up the term eddy). BUT, that does not prevent less well-informed individuals (and organizations, such as the Patent Office) from using the term to describe something which technically does not involve eddy currents.

Of course the first step in looking up any information is knowing how to spell the related terms. I frequently use Siri on my iPhone or Mac, or one of the dictionaries that lets you speak the term(s), to find out how to spell words.

__________________
Teaching is a great experience, but there is no better teacher than experience.
Register to Reply
Power-User

Join Date: Feb 2013
Posts: 251
Good Answers: 4
#25

Re: Billy D Willoughby

01/30/2017 7:21 PM

Eddie Fisher sure shocked the music world and electrified his fans!

Register to Reply Score 1 for Off Topic
Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 3918
Good Answers: 119
#26

Re: Billy D Willoughby

02/07/2017 4:32 AM

Eddy currents are electricity.

__________________
Give masochists a fair crack of the whip
Register to Reply Score 1 for Off Topic
Register to Reply 26 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

Andrew Westman (5); Anonymous Poster (1); Codemaster (1); dkwarner (4); JE in Chicago (2); Jpfalt (3); lyn (1); phoenix911 (1); Rixter (1); SolarEagle (1); tripleee65 (5); wayneelowe (1)

Previous in Forum: Low Capacitance Coupling in Mains Step-Down Transformers   Next in Forum: Help Me With This!

Advertisement