Tinman's coil shorting circuit

[gyulasun]

......
Let me know of any typo's that need fixing.

Hi Vortex1,

Thanks for typing the text, I put in bold where a typo occured if you do not mind:


"ATDC- second inductor become open from stator winding and back EMF is sent to load."   =   "becomes"

"This torque gives the RT the torque required for the power generated at stator Aand also the torqu increase seen in the videos when driving a load such as the fan."      =   "A and"  and   "torque"   

"In the center of the stator core is as folows:"   =   "follows"

I agree with discussion and creating a timing diagram and a schematic.  Maybe a bit early to ask but I am curious and would like to know where Brad may have meant the center of the stator core?
I copied a photo of a 2 pole stator core of an universal motor from one of Brad earlier videos to help visualize what kind of stator core may be under this discussion (if he means similar here of course). Do we have to drill a hole in the stator and embed a magnet?  If so, where is the center of  the stator core I wonder and sorry if this question sounds trivial...   

Thanks,
Gyula

EDIT:  in the meantime I figured the magnet is perhaps to be embedded into one of stator poles' center?

[Vortex1]

Hi Vortex1,

Thanks for typing the text, I put in bold where a typo occured if you do not mind:


"ATDC- second inductor become open from stator winding and back EMF is sent to load."   =   "becomes"

"This torque gives the RT the torque required for the power generated at stator Aand also the torqu increase seen in the videos when driving a load such as the fan."      =   "A and"  and   "torque"   

"In the center of the stator core is as folows:"   =   "follows"

I agree with discussion and creating a timing diagram and a schematic.  Maybe a bit early to ask but I am curious and would like to know where Brad may have meant the center of the stator core?
I copied a photo of a 2 pole stator core of an universal motor from one of Brad earlier videos to help visualize what kind of stator core may be under this discussion (if he means similar here of course). Do we have to drill a hole in the stator and embed a magnet?  If so, where is the center of  the stator core I wonder and sorry if this question sounds trivial...   

Thanks,
Gyula

EDIT:  in the meantime I figured the magnet is perhaps to be embedded into one of stator poles' center?

Thanks gyula, I made the corrections (I was in a hurry and out the door to the doctors when I posted that) but no excuses for my bad English.

Brad called the view a "face view" which means to me that if you were in place of the rotor and were facing the stator, then the hole would be dead center of the stator face.

This is where I drilled the hole on my first test motor., but from the outside drilling into the face.

I will have to make the hole a bit bigger to accommodate the extra coil and sleeves.

Thank you for your contributions.

PS to all: please be sure to credit Brad with the phrases and not me should you cut and paste them. This seems to have created a problem for somebody on the other forum.

[gyulasun]

Hi Vortex1,

Thanks for your explanation, now it is clear for me where the magnet (with its iron tube and extra coil)  is to be placed.
I suspect the material for the steel or iron tube may matter from eddy current point of view, even though this second inductor winding (sitting on the outside of the iron tube) seems to have a pulsed operation. Of course this eddy current issue is my early speculation on this.   Should it matter, a ferrite bead could be used instead (though it may be difficult to find a suitable size).

Regarding the timing, first I think we should figure out whether the pulsed operation or rather the effect of it what the brushes insure for the rotation of the rotor (to work in an attraction mode) is just good for controlling the MOSFET switch or not.
As Brad wrote there is a Before and then an After TDC position for the rotor with respect to the second coil where the MOSFET is to be switched on and then off.
Question is whether a Hall or opto sensor should be used or the needed "control info" manifests in the normal change of the induced stator voltage from which we could derive the gate-source control voltage instead. From Brad's earlier writings in June I figure the latter case seems to work (i.e. no need for a Hall or opto sensor, I may be wrong here of course).

It is fortunate you already made a hole for a magnet earlier in a stator core, I assume it was for another test/project.
Unfortunately, I have no means in my home (in a block of flats) to build such setups due to lack of a lab, and I am now in pension. 

PS I hope your health is okay as per the doctors. 
Gyula

[shylo]

Hi Guys, In the original discussion , I don't recall any talk about drilling holes and inserting magnets.
Brad said that the only thing he wouldn't reveal was the circuit for the shorting, hence the block in his schematic.
If there were a magnet inserted in the stator core why is it not shown?
It seems like we keep getting steered away from the original set-up.
artv

[Vortex1]

Hi Guys, In the original discussion , I don't recall any talk about drilling holes and inserting magnets.
Brad said that the only thing he wouldn't reveal was the circuit for the shorting, hence the block in his schematic.
If there were a magnet inserted in the stator core why is it not shown?
It seems like we keep getting steered away from the original set-up.
artv

You are correct, we can never fully know if we have information or disinformation until a successful replication is accomplished. Indeed talk of the magnet came later, and there was no mention of a second coil at that particular time.

I often wondered if all of Steven Marks ramblings to Lindsay Mannix kept his gov't check to seed disinfo coming in the mail , so I often discount those email exchanges in favor of the videos for first hand info when researching the TPU.  Some of those exchanges have truth, some are fiction.

Each must decide for himself what is truth and what is fiction and choose the appropriate path of action.