| Topic: |
Science > Physics |
| User: |
"Scubasteve" |
| Date: |
28 Oct 2006 11:09:43 PM |
| Object: |
Electromagnet Design Questions |
Hello !,
I am trying to design one of those magnetic levitators that use a
solenoid to hover a metallic ball. It's mainly going to be used to
demonstrate transfer functions and types of control.
Anyways, I am looking for some basic tips on how to create an
electromagnet to be useful over a longer range. I am hoping to have the
ball hover at least 2 inches away from the surface of the
electromagnet. What would the tradeoff be between a flat or long
electromagnet?
I am not worried about the electrical part of the design, since that is
my specialty. But, I don't really have an in-depth understanding of how
the electromagnet works and how you can focus the flux lines.
Also, is it worth trying to find another material for the core other
than iron? Any suggestions? Suppliers?
Thanks a lot!!!,
Steve
.
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| User: "Androcles" |
|
| Title: Re: Electromagnet Design Questions |
29 Oct 2006 12:23:33 AM |
|
|
"Scubasteve" <mcfadyen.steve@gmail.com> wrote in message
news:1162094983.852575.215710@e3g2000cwe.googlegroups.com...
| Hello !,
|
| I am trying to design one of those magnetic levitators that use a
| solenoid to hover a metallic ball. It's mainly going to be used to
| demonstrate transfer functions and types of control.
|
| Anyways, I am looking for some basic tips on how to create an
| electromagnet to be useful over a longer range. I am hoping to have the
| ball hover at least 2 inches away from the surface of the
| electromagnet. What would the tradeoff be between a flat or long
| electromagnet?
|
| I am not worried about the electrical part of the design, since that is
| my specialty. But, I don't really have an in-depth understanding of how
| the electromagnet works and how you can focus the flux lines.
|
| Also, is it worth trying to find another material for the core other
| than iron? Any suggestions? Suppliers?
|
| Thanks a lot!!!,
|
| Steve
There is alnico, and Ferrite rods:
http://tinyurl.com/ylszbh
http://www.treehugger.com/files/th_images/magnetic_levitation.jpg
You may have more joy with Google images rather than Google web.
Androcles
.
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| User: "Scubasteve" |
|
| Title: Re: Electromagnet Design Questions |
29 Oct 2006 10:52:53 AM |
|
|
And still no qualitative answers to the problems I have proposed.
Through more research, I have found that it is best to have a shorter
distance between poles, which implies a flat and wider electromagnet
winding arrangement.
I have also concluded, it would be best to use alternate core
materials, but it wouldn't be a feasible expense considering the
marginal performance gain.
Things such as core saturation,how to cool the electromagnet, and how
the temperature affects the transfer function, continue to be
questions. If anyone has any input rather than, "Search google for
electromagnet temperature affects", I would really appreciate your
insight.
.
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|
|
| User: "Androcles" |
|
| Title: Re: Electromagnet Design Questions |
29 Oct 2006 12:39:55 PM |
|
|
"Scubasteve" <mcfadyen.steve@gmail.com> wrote in message
news:1162140773.601856.69790@k70g2000cwa.googlegroups.com...
| And still no qualitative answers to the problems I have proposed.
Oh, you want QUALITATIVE answers, in other words do it all for you.
Ya gotta pay.
http://www.amasci.com/graphics/levit2.jpg
Now go away.
*plonk*
Androcles
.
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| User: "Scubasteve" |
|
| Title: Re: Electromagnet Design Questions |
29 Oct 2006 04:36:28 PM |
|
|
This is a forum for people that need help with matters of physics and
members are to answer questions pertaining to their knowledge or ask
questions for their lack thereof.
I did my part by asking a fairly specific question, you showed much
interest without any sharing of pertaining knowledge. Either you know
the answers, or you show insight, or do not bother giving a response.
It is really that simple!
It's almost like you're masquerading as someone with knowledge of this
particular subject, which is fairly frustrating. It's almost analogous
to the notion "If you have nothing nice to say, don't say anything at
all"., "If you don't know what you're talking about, don't say anything
at all".
Steve
.
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|
|
| User: "Bob Cain" |
|
| Title: Re: Electromagnet Design Questions |
01 Nov 2006 02:05:00 AM |
|
|
Scubasteve wrote:
"If you have nothing nice to say, don't say anything at
all"., "If you don't know what you're talking about, don't say anything
at all".
Unfortunately you are responding to one who is the antithesis of this
principle. He can be safely ignored.
Bob
--
"Things should be described as simply as possible, but no simpler."
A. Einstein
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|
| User: "Sam Wormley" |
|
| Title: Re: Electromagnet Design Questions |
28 Oct 2006 11:17:25 PM |
|
|
Scubasteve wrote:
Hello !,
I am trying to design one of those magnetic levitators that use a
solenoid to hover a metallic ball. It's mainly going to be used to
demonstrate transfer functions and types of control.
Anyways, I am looking for some basic tips on how to create an
electromagnet to be useful over a longer range. I am hoping to have the
ball hover at least 2 inches away from the surface of the
electromagnet. What would the tradeoff be between a flat or long
electromagnet?
I am not worried about the electrical part of the design, since that is
my specialty. But, I don't really have an in-depth understanding of how
the electromagnet works and how you can focus the flux lines.
Also, is it worth trying to find another material for the core other
than iron? Any suggestions? Suppliers?
Thanks a lot!!!,
Steve
See: http://www.google.com/search?q=electromagnetic+levitation
.
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|
| User: "Scubasteve" |
|
| Title: Re: Electromagnet Design Questions |
29 Oct 2006 12:06:01 AM |
|
|
Sam,
Thank you for your reply. I have been searching google for hours now
trying to find this answer; hence my request for information through
this group.
The main question is, how does the radius to length ratio of a solenoid
affect the field in regards to the strength at particular distances?
Also, are there alternate core materials rather than iron that will
produce appreciably better results? If so, where could I purchase some
of this material?
Best regards,
Stephen
Sam Wormley wrote:
Scubasteve wrote:
Hello !,
I am trying to design one of those magnetic levitators that use a
solenoid to hover a metallic ball. It's mainly going to be used to
demonstrate transfer functions and types of control.
Anyways, I am looking for some basic tips on how to create an
electromagnet to be useful over a longer range. I am hoping to have the
ball hover at least 2 inches away from the surface of the
electromagnet. What would the tradeoff be between a flat or long
electromagnet?
I am not worried about the electrical part of the design, since that is
my specialty. But, I don't really have an in-depth understanding of how
the electromagnet works and how you can focus the flux lines.
Also, is it worth trying to find another material for the core other
than iron? Any suggestions? Suppliers?
Thanks a lot!!!,
Steve
See: http://www.google.com/search?q=electromagnetic+levitation
.
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|
|
| User: "Sam Wormley" |
|
| Title: Re: Electromagnet Design Questions |
29 Oct 2006 12:18:17 AM |
|
|
Scubasteve wrote:
Sam,
Thank you for your reply. I have been searching google for hours now
trying to find this answer; hence my request for information through
this group.
The main question is, how does the radius to length ratio of a solenoid
affect the field in regards to the strength at particular distances?
Also, are there alternate core materials rather than iron that will
produce appreciably better results? If so, where could I purchase some
of this material?
Best regards,
Stephen
Sam Wormley wrote:
Scubasteve wrote:
Hello !,
I am trying to design one of those magnetic levitators that use a
solenoid to hover a metallic ball. It's mainly going to be used to
demonstrate transfer functions and types of control.
Anyways, I am looking for some basic tips on how to create an
electromagnet to be useful over a longer range. I am hoping to have the
ball hover at least 2 inches away from the surface of the
electromagnet. What would the tradeoff be between a flat or long
electromagnet?
I am not worried about the electrical part of the design, since that is
my specialty. But, I don't really have an in-depth understanding of how
the electromagnet works and how you can focus the flux lines.
Also, is it worth trying to find another material for the core other
than iron? Any suggestions? Suppliers?
Thanks a lot!!!,
Steve
See: http://www.google.com/search?q=electromagnetic+levitation
You may find some of this material interesting
http://www.ndt-ed.org/EducationResources/CommunityCollege/EddyCurrents/cc_ec_index.htm
.
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