Solid State Pulse Motor

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  • Last Post 03 September 2024
unimmortal posted this 03 July 2024

Hi all,

This thread is around the continued development and build of my pulse motor. I've joined this forum as there is lots of good discussion and information around coils.

What you're looking at is two rotors with 3 stacks of magnets, 4 sets of 3 coils (approx 1200 turns each, 25ohm, 0.5mm wire), and two sets of 3 coils (1mm) to pulse the rotors. The gen coils sets are going to be wired as POC. And a quick test after setting this up sees an easy 50V from 1 of the 4 sets of gen coils.

Really looking forward to sharing some results.

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unimmortal posted this 03 July 2024

Ok, just getting used to the forum... here's the image for the description above and below.

I'm switching with IRF540N's which do a great job, but do get hot pretty quickly. My intro video (meet and greet) had me using the generator coils as pulse coils, which at 25ohm (@36V) kept current down to ~200mA. The 1mm coils come in at 1.4ohm... so they need to be replaced with higher resistance coils.

I'm also using UGN3503AU hall sensors (green leads) as I get a 2.5V-4.5V output (powered by batteries, black boxes), which is perfect to trigger the FETs.

Pulse coils are offset to the gen coils as it gives the rotor a forever forward flux path. 

 

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This setup replaces the L1 as the primary in a solid-state system, with rotating magnets that time the delivery of the flux across the POCs. 

Both rotors are set as N up, S down for the moment, so there is a strong flow of flux. The magnets are stacked 20x20/10x5/20x20 N40 Neo's which don't really wake up until you hit them with 30-36V. Stacking magnets increases field strength as well.

Frequency wise, with the rotor at 2000rpm I'm working with ~100hz.

More to come...

 

 

unimmortal posted this 21 July 2024

After a fun few weeks of testing I'm now pulling 140VAC from a 14W input... inadvertently, by having the POCs within the rotors, I get a much increased pulse as the pulsing POCs work together. At the moment the pulsed POCs are wired and pulsed in parallel, but the plan is to split the switching so that the ~70V of EMF can be bucked. A 36V/.5A  return will make this a self runner.

Without a scope (Siglent SDS1104X-E is on the shopping list), I only have multimeters to roughly gauge how the POCs are behaing.

For the generator POCs, with diodes for direction in place, I can clearly see the load of 7x12V mini edison globes dragging down both coil sets relatively evently from 60V > ~50, when placed on the native wound coil set. But the same load again on the regauged coil set, sees it drop as low as 27V and 36V on the other side. So definitely levels of interaction going on here.

I'm wondering whether I need to make a simple mechanical commutator to pulse the re-guaged set of coils to 'trick' the current to flow in the opposite direction at the right tme. Something a scope will help with.

The really exciting part of this, if I were to pulse from outside of the rotors, my output would double to 280V across the dozen coils within the rotors. And further, if I loaded the other half of the rotors with opposite magnets, I could potentially double again by alternating flux flow.

 

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Plasmonic posted this 21 July 2024

Hey Unimmortal!

Looks to be a very interesting project, I cant add much to your effort but I just wanna step in to say something about the scope choice.

I own a SDS1202X-E the two channel 200MHz model and it's a very nice scope, rather easy to use.  It does seem to have some noise issues though.  You can find comparisons online of Rigol vs this Siglent model that expresses this but it can also be noticed in my replication post and noted by Chris that my scope has a lot of noise, even with a odd but very clear POC saw tooth wave.

I really like the phosphor screen simulation and it's quite useful so long as you trust the scope trigger setting.  A very nice scope but just wanted to point out the noise before you grab one up.  I originally expected my PSU to be the noise problem but after researching the scope I am leaning more towards the problem being more in the scope than not.  Again, it's nice and works great but maybe take a minute to look up a Rigol as an affordable alternative.  Do your own due diligence, I just wanted to offer that up.

I look forward to seeing more, thank you for sharing a very nice build!

P.S. I mostly say this because of current measurements, they are in the mV range where you will start to see that inherent noise, otherwise great scope.

Matt

 

unimmortal posted this 22 July 2024

Thanks for the feedback Matt. I'm going to need 4 channels to see the 4 coil sets, and 100Mhz seems to be entry level these days - 200Mhz would be nice. Rigol v Siglent seems to be an ongoing debate, but seeing as this will be my first scope I don't think I'll go too far wrong with either. So it'll come down to dollars. All opinions and advice welcome 😁

unimmortal posted this 02 September 2024

I've now got to the point where the generator PoCs are balanced. I've put in ~3mm plastic washers to give the fields some air to build. Initially blinded by numbers, I soon realised that the effect is now beginning to work.

Typically I can get 50-90V from 3 coils, but as you'll see in the vid - it takes 3 minutes to even get to 35V in an open circuit - albeit with diodes directing.

The fields are maintaining and building very slowly in opposition to each other. There is still plenty of air-gap between magnets and coils, and I'm still to switch the coils with a commutator - but that seems the likely place to tune manually instead of using a bias capacitor. 

 

 

unimmortal posted this 03 September 2024

So now for the maths. I need to work out capacitance, inductance and self resonance for the coils in order to work out my optimal rotor rpm.

Each coil is: 7.4 ohm, 0.5mm (24 AWG), 150g in weight, 90 metres in length, 37x20mm cores, 1150 turns (approx)

If anyone can point me at a calculator that I can understand, it would be very much appreciated.

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