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Registered Member #54402
Joined: Mon Feb 02 2015, 11:09PM
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Posts: 86
Hi , please help me out i have thought about this yet havent generated useful answers elsewhere.
The idea is as follows.(for sake of simplicity I avoid more complicated design which would also have higher efficiency and or without brush contacts.) A faraday disc . A constant rotational torque source that spins the disc which we assume as input energy into the system.Now as the disc spins no current is induced, because there is no magnetic field present to drag the electrons sideways, or should I say generated since the disc operates on lenz law rather than faraday induction law. I now inject a kickstart current into the disc so curent flows and so it creates a magnetic field along it's way , given the fact the disc is spinning the magnetic field should now create further current , (assuming I have some load attached to the disc via brushes to make a complete circuit for the current to flow.)
I am asking is this possible and would it work , can a disc like this create its own excitement field for current production without any external magnets or exciting coils , the geometry of the disc can be varied to make the field lines through the disc better. So would it work, what do you think?
It's certainly possible for a motor to generate it's own field. The earth's magnetic field is thought to be produced this way. I'm not convinced this setup would do much, the field would be at right angles to where you'd think it needs to be.
Registered Member #54402
Joined: Mon Feb 02 2015, 11:09PM
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Posts: 86
hen918 electricity flows through the disc only if its rim is connected to the center to form a closed loop , and the wire connecting them must be sationary or move at a different speed with respect to the disc itself, that much i have learned.
Well a single disc with brushes ofcourse is a very inefficient machine due to the low voltage high current situation.I am using this just as an example for simplicity , a real world machine could have more discs, turns and would also be able to have the b field and more desired angles the perfect angle being 90degrees to the surface of the conductor.
Registered Member #54402
Joined: Mon Feb 02 2015, 11:09PM
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Posts: 86
Yes I have read this and where it says self excitation it still mentions field coils only the difference being that the weak leftover field in the armature first produces a small current in them until the current further builds up.
I was thinking in my case with no field coils as they normally come as a separate entity , just the disc and that's it then once current flows through the disc that current produces a b field and that b field continues to produce current as long as the disc is spinning , something like this, will this work? with no separate field coils in series just the disc for example.?
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Salvador wrote ...
Yes I have read this and where it says self excitation it still mentions field coils only the difference being that the weak leftover field in the armature first produces a small current in them until the current further builds up.
I was thinking in my case with no field coils as they normally come as a separate entity , just the disc and that's it then once current flows through the disc that current produces a b field and that b field continues to produce current as long as the disc is spinning , something like this, will this work? with no separate field coils in series just the disc for example.?
Current doesn't just magically return from the edge of the disc to the centre, it's carried there by a conductor, which has to close the circuit. This represents both your field winding, and your load (assuming series connected field). If that return conductor is looped a few (N) times, then the H field it creates will be N times that of a straight conductor. Like I said, it's just geometry. Once you've identifed the field path generated by the return conductor and intercepted by the disc, you may want to make some of that iron, to increase the amount of B field you get per H field. That's only fiddling about with the efficiency.
Registered Member #54402
Joined: Mon Feb 02 2015, 11:09PM
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Posts: 86
Ok, Dr.Slack, just to confirm , a single disc , yes it has some load atached to it via brushes which also completes the circuit because wthout that there is no path for the current to flow , so brushes , disc and load say a light bulb , and that's it no permanent magnets no field coils no nothing just a start up current kick say from a battery after the disc starts to spin to create the first current and the b field , and this will work?
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
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Posts: 1546
In a homopolar generator, assume you have magnets.If the disk spins, and current flows to a load, for example, a homopolar motor ,then the rotational force is moved from disk to disk.
The same force exerted on the disk of both machines, is exerted on their magnets.
What objects that rotate transfer energy without electricity?
Try thinking about a solution that isn't at all conventional.
Homopolar means one pole. Instead of wires, is there any way of moving the energy on the magnetic field ?
Why did they build the Barlow's wheel about 200 years ago ?
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self excited homopolar generator (no PMM!!!)
