Pulse Motors- Your building them wrong.

[sm0ky2]

Somethings to think about:


- pulse at the rim, generate at the shaft
  Could be done with shaft magnets or from the inside side of the coil


- adding ring oscillators to pulse a second coil in resonance


- super capacitors parallel to the ground circuit (w diodes)
  to store stray currents that are otherwise dumped to ground


- bifilar (unipolar) pulse coils, to maximize electrical usage efficiently
  bipolar windings generally waste 1/2 of the current creating a field on the back of the coil


im sure we can add to the list

[MagnaProp]

Sounds good to me sm0ky2. First things first though. We must follow the directions and do the initial tests before we can get jiggy wit it.

Construction updated photos attached. Super and hot glued a piece of foam board to the top and spray mounted the circular graph to that.  I'm itching to start turning the power on.

[Nali2001]

I know I am going way slow but besides the rotor I also now finished the coil. Its way more wraps then I would normally use. Its 11ohm. almost a 1cm thick layer of 0.5mm wire.

[MagnaProp]

Your build quality looks really good to me. I hope to get up to that level next time around. I just finished going through the manual and some videos on how to use my power supply. That green GND port took some research to figure out. I've always known black and GND to be the same thing when messing with RC and Arduino. From the info I found, I should basically stay away from that "earth ground" in most setups I make. I feel that I'm getting closer to turning on the juice. I'm going through the test videos again to help me get that right.

Magnaprop
One important aspect is the pulse time period.

When the current starts rising in a coil the magnetic field starts expanding. When the magnetic field is done expanding all the current starts generating heat in the resistance of the coil. We call this "flat lining", if we watch the current flow on a DSO it starts rising and when it flattens out it starts generating heat.

I often use a voltage sensor, current sensor and a hall effect magnetic field sensor attached to my DSO when tuning coils. This way we can tell how effective or efficient our setup is. Our goal is to produce the strongest magnetic field using the least amount of energy. So it pays to know how strong the magnetic field is and what it's doing relative to our input. 

AC

Thank you for the tips. I hope to put that info to use when we get to the circuit building part.

[MagnaProp]

Got some power into the coil. I have a tesla meter so I thought I would use that to get the neos and the electro mag in the same ballpark before I try the pull test method we are supposed to do for getting the neo and electro mag evened out.

With the amps limited to 2 on my power supply, I turned up the voltage until the amps peaked at the 2 amp limit mark. The voltage went up to 10 and the tesla meter read (96.0mT). One of my neo magnets reads (211mT).

So I need to make this electromagnet twice as strong as it presently is. My question is should I limit the amps to 4 on my power supply then turn up the voltage until I hopefully reach about 211mT or is that too many amps and I just need to make a new electro magnet? Do I just turn up the voltage a little at a time and check the electro magnets temperature as I go? Asking about how to proceed since I find working with power supplies a bit scary at this early stage in my learning curve.

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As a side note I thought it was interesting how the number of neo mags relates to their power. It appears there may be a point of diminishing returns as more are stacked together, at least when measured at the pole tips it seems. I started with 12 neos and thought removing half the magnets would cut their power in half but that wasn't the case. I don't know if this has to do with the inverse square law thing or if just adding more neos together creates more flux resistance to move through. Attached picture is the reading of just one neo.This is what I found...

Code Select Expand


12 neos = 445 mT.
6  neos  = 390 mT.
1   neo  = 201 mT.