Rotor Magnetic Polarity

[mckayped]

Hi People,

10' Wind Turbine w/ 12 magnets per 12" rotor & 9 coils.

I just placed my magnets on my rotors and glued them down - then I found a spare magnet and re-checked polarity.  I think I screwed up.

The twelve magnets of each rotor alternate polarity just fine.

However the TDC (Marked) magnets on each rotor attract my test magnet.

Oops.  I think I should have checked before I glued.

I was reading Hugh's book, and he indicates that it may be possible to rotate one of the rotors 90 degrees.  Possible?

If not I may be drilling out the rear rotor with a new 4 bolt pattern.

Has anyone made this mistake?

What's the best way to salvage the project.

One rotor is in the mold.

I appreciate any and all help.

Thanks

Pete

[zapmk]

Hi Pete,

Been there done that, What kind of glue was used to hold them down ?

If it was super glue it is very easy to take the mags back off with a wood block and hammer.

 -Zapmk

[RP]

Yeah I think a 90 degree shift would work.  Thie first quadrant would be north, south, north and the second quadrant (90 degrees around) would be south, north, south.  If you've got a 4 bolt pattern then you should be in good shape.  

Don't forget to remark a new TDC point in case you take it apart in the future,

[mckayped]

Thanks for the reply Zapmk.

T'was LockTite super glue.  Lots of it to be sure the edges of the magnets were sealed.  When knocking off the magnets - do they clean up OK?  Does the plating get damaged?  Do you clean up the rotor before placing the magnets back?

I really hope that I can rotate 90 degrees.

Thanks again.

[mckayped]

Allright!!

That's what I was hoping for.  That takes some suspense out of waiting until assembly time.

I appreciate your help.

Pete

[Flux]

Yes 90 deg works for a 4 hole bolt fixing.

Superglue doesn't stick much and you would have no trouble removing the magnets without damage, but the 90 deg trick should get you out of trouble.

[DanB]

If you'r rotors are drilled out with 4, or 6 holes then you have no problem - just rotate one 90 deg.  If you've drilled out 5 holes then you need to either take the magnets off and put them down again - or...  redrill.