TinMan Generator Research Moderated Topic

[Grumage]

Actually, I might have been a bit more clear by using "stator laminations" instead of "frame', but I hope I was able to get my point across.

I am definitely no expert regarding electric motors!

PW

Dear picowatt.

Aw, now you've  gone and ruined it!! The correct term is " Frame "!!

The pole pieces were attached separately in the good old days.

I'm surprised you had not seen a screw shank milling cutter before, you do need a special chuck to use them, but once secure they don't budge so you can accurately bore a hole to size and depth.

Most of my working career was spent in both Electrical and Mechanical engineering, big boys toys, sort of thing. 

Cheers Grum.

[picowatt]

Dear picowatt.

Aw, now you've  gone and ruined it!! The correct term is " Frame "!!

The pole pieces were attached separately in the good old days.

I'm surprised you had not seen a screw shank milling cutter before, you do need a special chuck to use them, but once secure they don't budge so you can accurately bore a hole to size and depth.

Most of my working career was spent in both Electrical and Mechanical engineering, big boys toys, sort of thing. 

Cheers Grum.

As for frame versus laminations, clarity for the masses...

As for the milling bit, just because I own a few machine tools does not make me a machinist!

I get by...

PW

ADDED:  I did a search for screw shank end mills and did not return a lot of hits (none actually).  Are they very common where you are?  Do they go by another name?

[tinman]

I thought you were filing the brushes to a point so that only one rotor segment one each side would be connected at a time.

Not on the motor you see in the video,as it has a higher number of poles on the rotor.The motors with 1/2 the number of rotor poles need only have one pole per brush contact<-- for the bulk of the time.

9 out of 10 motors will need the brush timing changed,or it will not perform very well -if at all.

[tinman]

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.

I am answering as i can.

[tinman]

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

https://www.youtube.com/watch?v=i91F5VQD4JM