Mysteries of the Robert Adams/John Bedini style Pulse Motor

[@royh4305]

Interesting research. Electricity and magnetism sure work in peculiar ways. I will be keeping an eye on your progress as we move forward. Thanks.

[@paulmaher812]

👍

[@deslomeslager]

Is the LED before or after the 'electronic switch'? We need to look at the schematic and chronological part of that circuit. With regards to your volt meter in the PSU: it is very well possible the volt meter is tapped off at a point where there is a diode to prevent the PSU from getting damaged. This would make you believe it is rectified. And it is in a way. Have you tried putting a real sinus voltage on your PSU? Most likely it will come out one way only (again). Any how, in electronics it is usually good to do research by measuring and checking every part of the circuit. If you have an oscilloscope you could find out even more.

[@paulmaher812]

Thanks for the comment. Once I had a chance to sleep on it I realized what is going on. So first off, this doesn't just show up with a PSU, I may have demonstrated this in a previous video, maybe not, if you just spin the rotor and replace the PSU with a cap you see the voltage in the cap. So voltage is being rectified but how? What gave it away for me was when in this video I moved the coil to different angles in relation to the hall effect sensor and the current and voltage out diminished then reversed. As each North then South magnet spins past the coil it traces out an AC sine wave, one would expect without a diode there would be not net DC current. What I didn't factor in previously is that the PSU or Cap is only connected to the coil for the brief time of the pulse. So perhaps considering a single peak -> peak of the AC wave, the coil is only connected for say 10% of that time. Even when the PSU power is at 0 the arduino is still making and breaking the connection to the PSU. So from there one can see how if you chop the wave up into 10% increments there will be places where the coil is putting out a a large positive voltage, at the zero cross it will put out nothing and places where it puts out a large negative voltage. It is actually an example of synchronous rectification. As I said for such a simple machine there really is a lot going on.

[@TGiFoosday]

I like building pulsed magnetic motors too. I made a high speed one (10K+ RPMs), that is bearing less. The rotor axel shaft is magnetically floated for extremely low friction. My 2 coils are bifilar wound and only have 2 magnets on rotor with North poles facing out and when power turned off it will spin for 20 minutes using the recaptured energy on secondary coils to capacitors. Fun to play with and try different configurations. I have a couple of tektronic CRT display O-scopes to get a good view of the waveforms in the circuitry and they really help show what happens when I change anything. I also have a small digital scope I bought as a kit on Amazon for less than $30 that is very useful too because it runs on 9V battery's, so it's portable also. Very handy. While O-scopes won't directly show you current flowing in a circuit, (probe is not and can't be in series with the circuit because they are a high impedance capacitive coupled connection). But I've learned from decades of usage that you can get a sense of how much current is present at the probe test point by looking at the brightness/thickness of the trace line displayed on the screen and compare how it appears to other places in the circuitry and how it looks when not connected to circuit under test. This probably only works on scopes with a CRT display also. You can adjust the focus and brightness controls to make this more noticeable also.

[@firdousahangar1189]

I like your experiments. These pulse motors look like crop circles. Coils seem to be all about geometry and placements & bifilar trifilar quatrafilar....

[@paulmaher812]

Thx Fird, Can't say I ever thought about the rotors in terms of crop circles, or know much about them but certainly an interesting observation. Yes, geometry of the magnetic fields and (for any motor that isn't a homopolar type motor) timing of how the fields change is, well, its pretty much the whole story.

[@Buzzhumma]

At 10 min mark you switch it off and the led dims . Ok so thats just simply the magnet rotating and creating a changing magnetic feild ie a generator . Is that correct . With the power on you get a collapsing magnetic feild as well

[@paulmaher812]

You are correct. Was just pointing out that what is coming out of the bridge rectifier isn't only from the "flyback" current of the collapsing field, the spinning magnets are also generating through the "drive" coil. In this set-up, eyeballing it looked like 90+% was coming from the flyback/radiant/inductive spike whatever anyone wants to call it. If you put three more coils in around the other magnets a) the machine should be more efficient b) with 4 coils in series inductance 4x and resistance 4x so I would say the strength of the flyback would be the same c) the current from magnets spinning past the coils though, should be 4x higher. Don't know for certain if that is right but don't see why it wouldn't be and should know more once I throw in a second coil.