47000 Watt Magnetizer

[citfta]

To add a little more info.  I boosted the voltage on the drive motor to 24 volts and as expected the voltage output doubled as well as the frequency.  So I am now getting 24 volts open circuit and 45 hz frequency.  The input current was only slightly higher but I did not have time to let things warm up first either.  I keep getting interrupted by family concerns so did not test under load.  However here is a screen shot from the scope.  You can see the output is not quite a normal sine wave but pretty close.  Again adjusting the angle to make the magnet move either more or less across the core will probably change that.

Carroll

[picowatt]

I did,but i dont think i would get a very good field/even field that way due to the round magnet and elliptical pole pieces.

Tinman,

You might consider elliptical pole pieces as mentioned but with a number of small neo cylinder magnets located as needed to provide the more homogeneous field you desire.

PW

[tinman]

Tinman,

You might consider elliptical pole pieces as mentioned but with a number of small neo cylinder magnets located as needed to provide the more homogeneous field you desire.

PW

Well I quite like the idea of making my own magnets, as they are expensive here in OZ. Im not sure how hard it is to magnetize a piece of soft iron, but half the fun is trying to do it-the other half is building the magnetizer.. speaking of the coil oscillating, wouldnt it do that with using a cap bank anyway, as you just have a tank circuit in reality when using caps.

[DreamThinkBuild]

Hi Carroll,

How close to the core do you have to stay to not get excessive cogging and still get good output?

The previous design is 5mm space between core and magnet. The magnet is 1-1/2" dia x1/2" thick N52

http://www.kjmagnetics.com/proddetail.asp?prod=DX88-N52

I did a quick test and I can move the coil out to about 2cm where the cogging diminishes and when the coil is shorted lenz is minimal but output drops. It still needs more testing with different angles to see how it goes.

[citfta]

Hi Carroll,

The previous design is 5mm space between core and magnet. The magnet is 1-1/2" dia x1/2" thick N52

http://www.kjmagnetics.com/proddetail.asp?prod=DX88-N52

I did a quick test and I can move the coil out to about 2cm where the cogging diminishes and when the coil is shorted lenz is minimal but output drops. It still needs more testing with different angles to see how it goes.

I was referring to the side to side movement of the magnet as it turns.  If you look at my picture if I increase the diameter of the magnet and move the coil out or increase the angle of the magnet it will move the edge of the magnet farther past the core of the coil.  I want to do some testing to see how that affects the cogging.  If I understand you correctly your magnet edges did move past the core and you got some cogging.  So I wonder where the sweet spot is?  Right now the inside edge of the magnet just does get to the outside edge of the core on my test setup.