TinMan Generator Research Moderated Topic

[Jimboot]

Thanks Jim

Yes, rather wide commutator segments    we'll see how she goes.
[size=78%] [/size]

Jim, if your input voltage drops, that is a sign you're using more current.

Luc

The run battery drew less voltage. That's all I was measuring. Anyway odds are I'm stuffing something up but it was interesting. I have no idea what I'm doing you understand?

[Jimboot]

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Now Jim-how is it that you can generate power to charge a battery,but instead of loading the prime mover up,it decreases the prime movers power consumption. Where is the lorentz force?.

Im not sure what you mean here?.Was the battery feeding the coil,or the coil full wave rectified,and charging the battery?.
If the battery was feeding the coil,then you just created a magnetic field around your stator winding,and the rotor is now more attracted to that part of the stator core. You will find(or should) that if you reverse the polarity of the battery feeding the stator coil,the motor should spin backwards.You can achieve the same effect by using a PM embedded in the stator core.
If you have rectified the stator coil,and are charging the battery,then you are off to a good start.

It is a curious effect. And it's got me hooked to get my brain cells around it. A nice little challenge to be sure. Btw I'm using a completely dead 20 yo alkaline 6v dolphin torch battery as my charge battery. I've been playing with pm as well. Hard to get to the core of this one though. Not sure how alan and grum are going with the same motor. Thanks for the tips. Esp the one about the <blink>PERMANENT MAGNET </blink>

[gotoluc]

The run battery drew less voltage. That's all I was measuring. Anyway odds are I'm stuffing something up but it was interesting. I have no idea what I'm doing you understand?

As long as you're having fun and learning at the same time

When you're using a battery to power something and you make a change and see the battery voltage go down, then it means your using more current. When you see the voltage go up, then you're using less current.

All the best mate

Luc

[tinman]

The run battery drew less voltage. That's all I was measuring. Anyway odds are I'm stuffing something up but it was interesting. I have no idea what I'm doing you understand?

OK-im lost.

[Vortex1]

Thanks Jim

Yes, rather wide commutator segments    we'll see how she goes.


Thanks Brad,

the reason I didn't cut down the keepers yet is, where ever we cut steel laminations there's a small build up of eddy currents at that location caused by some small shorts between laminations while cutting.  I don't know which would be worse, loosing a little flux or eddy currents, so I'll wait to cut them. Maybe adding an other magnet would be the better solution. I'll play with it fist.

An important note for everyone, if you cut transformer lanination make sure to add 1/4 inch steel plate exactly where you want the cut on each side and place it in a vice, or use vice grips or a C -clamp well tighten (on the side you want to keep) so not to cause inflation between the lamination layers while cutting. It also helps to guide the cut straight as you can rest your grinder cut off wheel on it. Also, another note is you must use as thin of a cut off blade as your grinder can use, which make the cut much cleaner and faster. No need for much pressure on the cut, let the wheel do the work. I would recommend to use a mask as there is silica in the metal which you don't want to breath. I've cut so much of the stuff and didn't think to wear a mask at first and you must wear goggles to protect your eyes.


Jim, if your input voltage drops, that is usually a sign you're using more current.

Luc

LUC
Those are very good points about cutting the laminations and the possibility for eddy current shorts. After the coarse cut, If you use a fine file or belt sander lightly along the length of the cut area to clean up the shorts and varnish the cut areas, you may be able to eliminate most of the shorts.
I agree trying it as is would be a good first step.

I wonder why you are using such a large motor for your initial tests, and your motor does not have the spiral rotor laminations. Any reason? Brad's motor was supposedly from an import buffer, and they can be had for less than $20 US. Also vacuum cleaners are along many trash pickup sites on the right days, but even those may be too large, not to say that the effect is not scalable.

My initial build a few weeks back using a Hoover vac motor and the Brad FET circuit originally published does not work as shown, so there are indeed missing components / information / magnet placements etc. Only Brad knows.

Regards
Vortex1