TinMan Generator Research Moderated Topic

[picowatt]

Dear picowatt.

I was in fact using a "Pozidrive" "cross head" type screwdriver gently touching the leading ( motor rotation ) Commutator segment to the brush holder. In fact you can retard the speed by placing the screwdriver on the lagging side. This was done with the shaved brushes and later with the standard brushes. In fact I actually state verbally what I'm doing at 3.38 minutes into the video.

Now as to the use of permanent magnets? The " jury is still out " !! Brad seems to be ignoring MY questions, perhaps you should ask him ? However if the drawings posted on page one of this thread are anything to go by, my gut feeling is that there ARE PM's involved, somewhere. 

Cheers Grum.

Grum,

So, in effect you were increasing the width of the brush contact with the armature somewhat when you were shorting with the screwdriver.  Correct?

As for the N52, have you attempted using any PM's in your RT experiments?

PW

[Grumage]

Grum,

So, in effect you were increasing the width of the brush contact with the armature somewhat when you were shorting with the screwdriver.  Correct?

As for the N52, have you attempted using any PM's in your RT experiments?

PW

Dear picowatt.

Correct.

In an early experiment I placed a stack of 3  15 x 6 mm dia Neo's in a hole drilled into one of the motors pole pieces, see attached photo. Unfortunately this motor was not ideal in it's topography as the brushgear was placed around 70 deg by design. As people may or may not be aware, there are actually two methods of Armature winding. Wave and Lap wound.

Cheers Grum.

[picowatt]

Dear picowatt.

Correct.

In an early experiment I placed a stack of 3  15 x 6 mm dia Neo's in a hole drilled into one of the motors pole pieces, see attached photo. Unfortunately this motor was not ideal in it's topography as the brushgear was placed around 70 deg by design. As people may or may not be aware, there are actually two methods of Armature winding. Wave and Lap wound.

Cheers Grum.

Grum,

That's a clean hole you cut in those laminations.  What did you use?

Your attempt to use some added magnets was an interesting and inspired idea.  I wonder if cutting off and trimming the pole piece and placing the magnet(s) between the modified pole piece and the outer frame would have been more effective.

Placing the magnets in the bored out hole as you have apparently done would tend to create only a local magnetic loop, that is, the motor frame surrounding the bored out hole would tend to act more so as a keeper between the north and south poles of the installed magnets.

Placing the magnet between the pole piece and frame would allow the installed PM's field to travel thru the motor frame and armature (effectively in series with the armature).  As well, the coil surrounding the modified pole piece/PM assembly could be used to modulate the field produced by the PM.

Very interesting...

Thanks Grum,

PW 

[Grumage]

Grum,

That's a clean hole you cut in those laminations.  What did you use?

Your attempt to use some added magnets was an interesting and inspired idea.  I wonder if cutting off and trimming the pole piece and placing the magnet(s) between the modified pole piece and the outer frame would have been more effective.

Placing the magnets in the bored out hole as you have apparently done would tend to create only a local magnetic loop, that is, the motor frame surrounding the bored out hole would tend to act more so as a keeper between the north and south poles of the installed magnets.

Placing the magnet between the pole piece and frame would allow the installed PM's field to travel thru the motor frame and armature (effectively in series with the armature).

Very interesting...

Thanks Grum,

PW

Dear picowatt.

The hole ? Ah, trade secret !!   

Inspired ? Yes, but not mine, the inspiration is Brads.

I'm also impressed by your use of the correct terminology for these machines. I had two years of day release learning about DC machines and strangely, there is, it appears MORE to them than meets the eye !!

Cheers Grum.

[a.king21]

Grum: Of course PM's are involved.
That's the whole point of the thread.