Rotor idea?

[motoman465]

One of my co-workers is taking machine shop in vo-tech and has offered to help me out by making some parts for me.  I was wondering about making a small rotor to accomodate my 1/2" diameter neos.  It would have ten holes drilled deep enough for two neos per hole.  What would it do to the magnetic field if the magnets were totally surrounded by steel?  Thanks!

Todd

[stephent]

the flux would mostly be drawn through the steel and not travel out into the coils much.

[motoman465]

Thanks, Stephent.  I kind of thought something like that might happen.  Oh well, if nothing else, it shows that there is something going on upstairs...LOL!

Todd

[nanotech]

If you haven't designed the rest of the generator yet, I would double your magnet "acreage" by putting them beside each other.  Either in rotation or in radius.  Or you could skew them as well....

[stephent]

or you could drill the holes a lot bigger (at least bigger then the mag + air gap) and kinda force the flux to go out thru the windings, instead of just to each side thru steel.

It won't "force" the flux--it would just make a less resistance path out thru the coils--maybe...gonna have steel laminations in the stator?

Don't give up the ship yet.

Just drill bigger holes and maybe use single mags, not doubled up.

[finnsawyer]

Magnetic flux, like electrical current, tends to follow the path of least resistance (reluctance).  By surrounding the magnets with iron you shorten up considerably the path for the flux from the face of the magnet exposed to the air to travel through the air and bend back to the iron.  This will increase the leakage flux at the expense of the flux passing through the coils.  The result will be a loss of voltage output compared to having the magnets mounted on the surface of the iron where the path for the flux to bend back to the iron and consequently the reluctance will be substantially greater.

[vawtman]

Todd were you a naughty boy with the pics again i dont see anything but a red x?

[motoman465]

WHAT?  Just one X, it should have been three..LOL!  No, I resized it and made sure it was at 100K before I posted it.  I dunno what happened.

Todd

[kurt]

i looked at your story to see if i could fix your picture the file has errors in it so cannot be displayed. probably from reducing a bitmap to under 100k next time try converting to a .gif before resizing paint can do that for you. .bmp's are usualy not exepted here becouse they are way huge for what they show.