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Science Forum Index » Physics - Electromagnetic Forum » torrus field generator
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| Guest |
 Posted: Thu Nov 15, 2007 9:39 am |
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the purpose of this question is to possibly design a practical
generator using a torrus shaped magnetic field.
because a torrus is circular the field is self shielding and
concentrates the flux lines at the core. It would be a good place to
make a current flow if coils in the core can be caused to move
correctly.
please discuss or correct the following notions:
1 wires moving in this field must CROSS lines of flux not orbit
parallel to them?
2 when a magnet rotates about it's axis does the field remain
stationary?
3 would a wire perpendicular to the core flux lines, rotated radially
be crossing them and result in voltage?
The question is practical because we already have the means to
motivate one torrus within the shell of another one.
Thanks for anyone's input.
sj |
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| Wimpie |
| Posted: Thu Nov 15, 2007 1:13 pm |
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Guest
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On 15 nov, 20:39, seape...@msn.com wrote:
Quote: the purpose of this question is to possibly design a practical
generator using a torrus shaped magnetic field.
because a torrus is circular the field is self shielding and
concentrates the flux lines at the core. It would be a good place to
make a current flow if coils in the core can be caused to move
correctly.
please discuss or correct the following notions:
1 wires moving in this field must CROSS lines of flux not orbit
parallel to them?
When you want to generate EMF, you are right.
Quote:
2 when a magnet rotates about it's axis does the field remain
stationary?
What field?
The total field everywhere is the sum of the individual fields,
provided that you feed your torrus with a constant current source.
When you feed with a voltage source, induced fields (by the moving
magnet) may change the current running through the winding. You may
also experience eddy current loss inside the magnet (that will create
counter acting fields also).
Quote:
3 would a wire perpendicular to the core flux lines, rotated radially
be crossing them and result in voltage?
No, your wire must be perpendicular (sine law) to the fluxlines and
must "cut" magnetic fieldlines to generate an EMF. In other words,
you need dflux/dt in your wire loop. It doesn't matter how you
generate the dflux/dt (that is by changing the flux, or changing the
captured flux by the wire loop).
If you mean in- and outwards with the word "radially" you will get an
EMF, as long as you cut fieldlines.
Quote:
The question is practical because we already have the means to
motivate one torrus within the shell of another one.
Thanks for anyone's input.
I hope this helps a bit
Wim
PA3DJS
www.tetech.nl |
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| Don Kelly |
| Posted: Fri Nov 16, 2007 1:12 am |
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Guest
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----------------------------
<seapeace@msn.com> wrote in message
news:5e4a1dbd-41f2-4084-8662-d4ed3b9ed19a@d27g2000prf.googlegroups.com...
Quote: the purpose of this question is to possibly design a practical
generator using a torrus shaped magnetic field.
because a torrus is circular the field is self shielding and
concentrates the flux lines at the core. It would be a good place to
make a current flow if coils in the core can be caused to move
correctly.
please discuss or correct the following notions:
1 wires moving in this field must CROSS lines of flux not orbit
parallel to them?
-------
true
---
Quote:
2 when a magnet rotates about it's axis does the field remain
stationary?
----
depends- what geometry are you considering?
----
Quote:
3 would a wire perpendicular to the core flux lines, rotated radially
be crossing them and result in voltage?
----
Yes
----
Quote:
The question is practical because we already have the means to
motivate one torrus within the shell of another one.
Thanks for anyone's input.
sj
The geometry that you appear to indicate "moving one torus within another"
seems to imply that the moving torus (a winding?) is moving internally in an
outer torus -that is in the direction of the magnetic field- if so you will
get no generation. Motion perpendicular to the magnetic field will produce a
voltage but there is the problem of moving conductors perpendicular to the
field and yet having them remain within the outer torus.
--
Don Kelly dhky@shawcross.ca
remove the X to answer |
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