Self accelerating reed switch magnet spinner.

[synchro1]

I had no prior experience holding something that is attracted to a magnet (a piece of iron, another magnet, a coil with an iron core, a coil with a magnet stack core)  near a spinning magnet with my fingers. And if you do that you feel this "rattle" or "vibration". And this rattle and vibration increases and diminishes with the distance from the spinning magnet. And there is a certain distance where the effect is very fine (but you still feel it) and the rotor seems to stay at a stable speed. This happens because your fingers are very sensitive and the rotor speed change is not visible without very good instruments.

This "rattle" or "vibration" occurs because the spinning magnet offers a cyclical changing magnetic field to the "thing" (if it is attracted by the spinning magnet). This is also the reason why a pick up coil picks up a sine wave current and not DC.

So, I was fooled by sychro1's outrageous claims, by my inexperience and by my eagerness to detect something strange. But I am only fooled once by the same fool.

So, I made an error of judgment. But I learn from my errors.

And when building and testing my "synchro coil replication" I did everything as I understood from synchro1, no intentional falsification. And I will do his beloved "one layer synchro coil test" when I find the time. But there is no hurry. I am not a full time experimenter. It is just a hobby and I do experiments only every now and then. And I do things that I find interesting (for whatever reasons). I do not take orders from others. But I like suggestions, clarifications and corrections from others (as long as they have some real experience), because I want to learn. And believe me, I would very much like to see something extraordinary. But that is more difficult than expected. In this respect I was really naïve.

Synchro1, may be you can be less aggressive, less vindictive and less misguided by wrong concepts in 2014? Nobody is sabotaging anything or anybody. Nobody is in a conspiracy against you. Calm down, stay cool, and have a happy new year.

Greetings, Conrad

This experiment is very, very easy to succeed at. I simply slip two 1" radial magnets into the core of a plastic Radio Shack magnet wire spool lightly wrapped, and position it where it vibrates. The output goes through the roof. You have to be a real "Turkey" not to get that to work.  


Your magnets are not very strong compared to the one's I use. You were instructed by me to merely wrap some plastic tape around your radial magnets, not build a "Taj Mahal" to intern it in for starters. All that's left to do is just to lash wrap a little wire on it. This is a two minute job!

[Magluvin]

@Mags: May be it is sufficient to wind a bifilar pancake coil which rings at a higher harmonic to the rotor frequency?

Example:

- bifilar pan cake coil rings at 12.800 Hz (50 * 256)

- rotor spins at 3000 rpm = 50 Hz (I see the 1 AC cycle for each revolution of the "diametrically magnetized spinning magnet" in my measurements)

The idea is to measure the ring frequency of the bifilar pan cake coil (with my function generator) and then to adjust the rotor speed to a lower harmonic (by varying the supply Voltage to the 12 V DC motor which I plan to use in the future to spin the magnet).

Greetings, Conrad

Hey Conrad

You have a bpc that rings at 12.8khz?  I have not seen such as of yet. Maybe pancakes ring lower than a normal layered coil?  How big is the coil?

What I was claiming in the post before this one you replied to, is that I needed 70ft of 26awg in series bifi, multi layer wound on a closed Ecore. I would have imagined that a bpc no core, or even an open core, might need to be large to get to the 10khz I am experiencing with a closed core.

I can get my coil to ring 9600hz by applying 4800hz, but loaded, not much more than 1 cycle gets to the output as the load kills off the unpowered resonance going into the next res cycle before the input influences it again at half the freq. Using the exact freq of the coils res, helps to keep the coil resonance active while loading. Helps a lot.  So hitting the coil with half of its res freq, output is not nearly as high as giving it the same freq. To get similar output using half freq, the input needs to be larger to account for the loss of the second res cycle that is not being driven.

Mags

[synchro1]

@Conradelektro,


Milehigh asked you to buy a D.C. motor. I want to warn you in advance that the motor's drive shaft will be a different dimension then your magnet hole. I know from experience that you'll find it extremely difficult to attach the drive shaft to the magnet without it wobbling!


My advice to you is to spin a large radial tube attached to a ball bearing at the base, on a concave cosmetic mirror with your current pulse relay coil sensor circuit. This will increase your torque and balance greatly with a minimum of expense and effort. Happy new year to you!

[MileHigh]

Conrad:

With respect to the load resistor, note that although it gives you the maximum power transfer, it is only 50% efficient because the pick-up coil is dissipating the same amount of power.  Suppose that your pick-up coil is 10 ohms.  So if you make the load resistor 90 ohms then the setup is 90% efficient at transferring power to the load, and the trade-off is that you transfer much less power as compared to the matched load resistor.  In mains power distribution it works like this.

MileHigh

[conradelektro]

......
Therefore the "safe" measurement protocol is to treat the spinning magnetic rotor as a near-constant-RPM device.  You are aware that the mechanical output power of the DC motor is equal to the mechanical output power of the spinning magnetic rotor.  However, you cannot easily measure this mechanical output power in your testing.  Ultimately this is not an issue since you only want to compare the performance of different pick-up coil configurations.  Hence the idea of the spinning rotor as a "device that spins at a constant RPM under different pick-up coil loads."  That gives you a constant-RPM reference for testing the pick-up coils.  You "do not know" what the mechanical output power is but that's okay because you don't need to know it.
......
MileHigh

@MileHigh: I build a contraption with a 12V motor (see the photo and specs, eventually I bought the one depicted and not the one mentioned in my former post, the price was 9.-- EUR). And it behaves as you say, a device that spins the magnet with a specific rpm (depending on supply Voltage) even under considerable load. I will do more tests coming week. Thank you for your explanations.

The coil measurements with my vertical model and with this new contraption match (under the same conditions: rpm and distance from spinning magnet, the spinning magnets are the same type in both "machines").

@Mags: I did not wind a bifilar pan cake coil yet. I just stated an idea when writing about spinning the magnet at a lower harmonic of the bifilar coil.

Greetings, Conrad