#### Cycle

##### Searl SEG roller magnetization - The Easy Way
«  »Last edited by Cycle
Hey, Russ. I was watching your video attempt at creating the sinusoidal magnetization pattern in the Searl SEG rollers.

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.
##### Re: Searl SEG roller magnetization - The Easy Way
« Reply #1,  »Last edited by Cycle
I'm reading Jason Verbelli's "Understanding John Searl's SEG" PDF file. In it, on page 83 of 302, it shows the SEG rollers are imprinted with a helical magnetic field, but it's not alternated North and South.

Perhaps one could create a geared system with Rotor1 which has a strong permanent magnet mounted at an angle such that its south pole is at the top, and the north pole is at the bottom. Rotor1 would be geared to Rotor2 which holds the roller such that the roller "rolls" past Rotor1's magnet at a low RPM (ie: Rotor1 makes, say, 16 rotations to Rotor2's one rotation).

This allows the permanent magnet to make several "swipes" past the roller. Rotor1 would have coils top and bottom (the coils would be stationary, with Rotor1's axle rotating within them) which would be energized at the exact time that the permanent magnet swipes past the roller, enhancing the permanent magnet's magnetic field strength sufficient to imprint the roller.

In this way, you get a helical magnetic field imprinted upon the roller.

In the same way, you could imprint the stators (remember, the stators need to be imprinted, too, but with north at the top, and south at the bottom, so the rollers are attracted to the stator), using a different gear ratio to account for stator size. The hard part is getting the right stator size, rotor size, swipe count and swipe width such that everything meshes. You have to have the same swipe width and an integer number of swipes on both the rollers and the stators.

Here's an example in keeping with the outer diameter of the first stator which Searl has stated:
 Roller radius: 0.625 Roller circumference: 3.92699081698724 # of Swipes: 16 Swipe Width: 0.245436926061703 ------------------------- Stator radius: 7 (7.03125 with 1/32" magnetic gap) Stator circumference: 44.1786466911065 # of Swipes: 180