Hey, Russ. I was watching your video attempt at creating the sinusoidal magnetization pattern in the Searl SEG rollers.
https://www.youtube.com/watch?v=2wQZ1ZCsrRo
How about creating a device which has two coils (one for N and one for S pole), with "fingers" which extend inward and interlock. The roller fits over these "fingers".
When the coils are energized, the "fingers" are magnetized, and thus the roller is likewise.
As an analogy, put both hands in front of you, and stick your index and middle fingers out. Now turn your hands toward each other (fingers of each hand pointing toward each other), rotate your right hand by 90 degrees (your left palm will be down, your right palm will be facing you), and interleave the index and middle fingers of the left and right hands while keeping the fingers straight. The coils would be on your wrists or thereabouts. The roller would fit over your fingers during magnetization.
The advantages of this design are two-fold:
1) You can heat the central region up above the Curie temperature of the magnet rollers to make them easy to magnetize, energize the coils, then let it cool off with the coils energized. Thus you get a good magnetization without a high current. The coils are distanced from the source of the heat, so they should be OK for as long as it takes to cool off.
2) You can change the "wavelength" of the sinusoid used... if you want a higher sine count, you'd use more interleaved "fingers", for a lower sine count, you'd use fewer interleaved fingers. You want the roller to have two full sinusoids per revolution? Then you'd use a two-"fingered" jig on each side. Three full sinusoids per revolution? Use a three-"fingered" jig on each side. Etc., etc.
In other words, each "finger" represents a half-wavelength of the magnetic field pattern imprinted upon the roller.
The only disadvantage is that you have to custom-build the jig for each sine count you want.
It might be beneficial if one pole's "fingers" are inside the magnet rollers, and the other's outside.
https://www.youtube.com/watch?v=2wQZ1ZCsrRo
How about creating a device which has two coils (one for N and one for S pole), with "fingers" which extend inward and interlock. The roller fits over these "fingers".
When the coils are energized, the "fingers" are magnetized, and thus the roller is likewise.
As an analogy, put both hands in front of you, and stick your index and middle fingers out. Now turn your hands toward each other (fingers of each hand pointing toward each other), rotate your right hand by 90 degrees (your left palm will be down, your right palm will be facing you), and interleave the index and middle fingers of the left and right hands while keeping the fingers straight. The coils would be on your wrists or thereabouts. The roller would fit over your fingers during magnetization.
The advantages of this design are two-fold:
1) You can heat the central region up above the Curie temperature of the magnet rollers to make them easy to magnetize, energize the coils, then let it cool off with the coils energized. Thus you get a good magnetization without a high current. The coils are distanced from the source of the heat, so they should be OK for as long as it takes to cool off.
2) You can change the "wavelength" of the sinusoid used... if you want a higher sine count, you'd use more interleaved "fingers", for a lower sine count, you'd use fewer interleaved fingers. You want the roller to have two full sinusoids per revolution? Then you'd use a two-"fingered" jig on each side. Three full sinusoids per revolution? Use a three-"fingered" jig on each side. Etc., etc.
In other words, each "finger" represents a half-wavelength of the magnetic field pattern imprinted upon the roller.
The only disadvantage is that you have to custom-build the jig for each sine count you want.
It might be beneficial if one pole's "fingers" are inside the magnet rollers, and the other's outside.