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Author Topic: B-field flux switcher  (Read 9589 times)

DreamThinkBuild

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B-field flux switcher
« on: July 28, 2011, 05:55:52 AM »
Hi All,

I've had this flux switching idea that has been nagging me for awhile, but no time to test it.  I'll just put the idea up here, any suggestions welcome.

If you look at your standard DC motor when the field windings are energized they create a torque to the rotor by repelling off the magnetic field. Now imagine this same effect where you don't move the field windings but only allow the path of the magnetic field to shift.

Take a heavy gauge wire and pass it through the center of a large toroid with magnets on each side to setup the magnetic field. By pulsing(+/-) the wire we are changing the path of the flux through the toroid. On the top and bottom half of the toroid we wind our pickup coils. We gain in two ways, we capture the changing flux in the toroid from the magnets and capture the B-field from the switching wire, nothing is wasted. I attached a picture to clarify.

Since we are using the B-field for the switching this could be 10ft of welding cable(0000 gauge wire/low impedance) with multiple units down the line. One pulse would activate the entire line, since the B-field is uniform along the entire length.

poynt99

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Re: B-field flux switcher
« Reply #1 on: July 28, 2011, 02:12:33 PM »
Seems to be a somewhat novel idea; much along the lines of the MEG and other flux switching schemes.

I think you could also use small coils on the toroid itself to perform the switching. As far as I know, many variations of this have been tried, and no one yet has demonstrated OU.

.99

Airstriker

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Re: B-field flux switcher
« Reply #2 on: July 28, 2011, 03:46:05 PM »
Seems to be a somewhat novel idea; much along the lines of the MEG and other flux switching schemes.

I think you could also use small coils on the toroid itself to perform the switching. As far as I know, many variations of this have been tried, and no one yet has demonstrated OU.

.99
I've seen something similar (patent) in the ORBO thread. I thought I had it on my harddrive but unfortunatelly not. Anyway, it's somewhere over there. But the idea presented here is much simpler and probably better. Should be easy to build and try.

@DreamThinkBuild: What software did you use to generate flux view (the colour one)?

broli

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Re: B-field flux switcher
« Reply #3 on: July 28, 2011, 05:10:27 PM »
There might be coupling issues when the pickup coil generates current, as it's wound around the toroid which penetrates the main current loop.

wings

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Re: B-field flux switcher
« Reply #4 on: July 28, 2011, 05:12:50 PM »
analog to Graham Gunderson ?


phoneboy

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Re: B-field flux switcher
« Reply #5 on: July 28, 2011, 06:57:15 PM »
@Airstriker, that image looks like it was generated by vizimag.

DreamThinkBuild

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Re: B-field flux switcher
« Reply #6 on: July 28, 2011, 07:52:52 PM »
Hi All,

@Poynt99,

I believe with enough current you can make any of these flux switchers to work. Whether OU can be achieved with this setup I'm still not sure.

@Airstriker,

I used the trial version of vizimag 3.19.
Here: http://www.vizimag.com/ordering.htm

@Broli,

I think you are right I didn't have a way to see how the B-EMF from the collapsing coil will impede the current loop. Maybe split the toroid into arcs but only have the pickup coil on the top and leave the bottom pickup coil off?

@Wings,

That's about the same principle, just a different setup. Thanks, have to look into that some more.

@Phoneboy,

Yep, Vizimag.