Self accelerating reed switch magnet spinner.

[TinselKoala]

A slight revision to the basic circuit diagram:

[synchro1]

@TK,


        I believe a 3D printer can manufacture the rotor part I described, and the design file can go into public domain freeware like Lasersaber's miser motor, accessable to all. Everything else is store bought. The rotor sleeve can be printed too with a square inside. This gives us two firewalls including the PVC housing to protect us from high speed disintegration. I believe a superior rotor and shatterproof housing like this would couple well with your brilliant MHOP circuit design, much more elegant than anything Farmhand ever created.

[TinselKoala]

Not my design, exactly. Mile High laid out the idea, the working principle and all the specifications, I just built it. And he gave me some critical advice along the way, too.

I solved a couple of problems and learned a lot building it, and it's not done yet. The op-amp board needs to have a regulated 12 volt supply that runs from the same batteries that drive the coil, and that's tomorrow's task. Some mechanical cleanup and the implementation of the adjustable positioning of one of the coils, for exact timing, will also be done tomorrow, I think.

I also think the sense coil can be a lot smaller, but I don't have any small magnet wire, just lots of #27.

I'm not sure I'd trust something made on a consumer-grade 3d printer rotating at high speeds. But I have no experience with those things, they have suddenly appeared while I was on Mars or something and I don't think I've ever actually worked with a printed part.

[MileHigh]

TK:

Thanks for giving credit where credit is due.  The MileHigh pulse motor circuit has a certain ring to it.  It's "radically different" from just about anything we have seen before.  To tell the truth I have mentioned it many times in the past but nobody would acknowledge it.  So I am glad and thank you for building it.  Perhaps it will get the creative juices flowing with some of the pulse motor builders.  That includes trying different sense coils.

The challenge for the pulse motor builders is to relate the geometry of the rotor magnet and it's associated magnetic field with the geometry of the sense coil and the resultant EMF output.  It's about understanding the interactions.  You have to be able to look at the scope trace of the sense coil output and try to understand why it is the way it appears on the scope and relate that to your setup.  Then perhaps try another geometry for the sense coil and look at the scope trace and try to understand that.  In other words, understand the basic interactions between a magnet and a coil.  That way you can start to design your motor with the physical configuration of the rotor and the drive coil and the sense coil in mind.  To do a mini rant of sorts, how many times have you heard people say, "How many turns and what gauge of wire for your coil?"  Do they actually use that information in a meaningful way beyond just by-the-numbers replication?  Chances are in the majority of cases, the answer is no.

Probably the next step for pulse motor builders is to look at the current waveform in the drive coil when it is energized and understand how the inductance and resistance of the coil wire and equivalent series resistance of the drive circuit affects the rising current waveform.  Also look at what influence the passing rotor magnets have on the rising current waveform.  So perhaps a standard investigation for builders would be to look at the current waveform without any rotor interaction and then look at the current waveform with the rotor spinning and understand the differences between the two (assuming there are differences).

Some people in this hobby advance and improve their skill set and knowledge year after year and some people just tread water year after year.  Perhaps the MileHigh pulse motor circuit will encourage some people to push themselves to learn and experiment more.

Here is a thought:  If you have a rotor with four magnets spaced 90 degrees apart, what is your maximum desirable conduction angle starting from top-dead-center with the assumption that our design goal is for maximum RPM?  The answer is 45 degrees.  I am not asking you TK, but rather I am asking the greater pulse motor builder readership:  Why is it 45 degrees?  This is just an example of the little details that all can go into making a better pulse motor.

Note that with the MileHigh pulse motor circuit you should be able to set the conduction angle to exactly 45 degrees with a minimum of fuss with near-perfect switching.  In contrast, with a conventional Bedini transistor-based design this would be impossible to do.

MileHigh

[MileHigh]

I also think it's worth mentioning again that there is no current flow in the sense coil.  The sense coil is a "pure EMF" device.  So that means that you can try a sense coil with thousands of turns based on super fine wire if you want to.  You can do anything you want.

However, like a proverbial chipmunk cracking an acorn eventually you will build up the knowledge to make your own design choices.  You might need an 800-turn sense coil or you might not.  Making those kinds of design decisions are supposed to be part of the fun.

MileHigh