Experiments·Transcript-backed
Motor Mayhem Magnet Rotor Speed Test at 12 Volts (6 Magnets)
Watch this motor mayhem magnet rotor speed test with a 6-magnet rotor running on 12 volts using 20 and 30 AWG bifilar coils. Real RPM readings, amp draw, and efficiency notes from the bench. Fewer magnets gave slightly higher rotor speed but similar overall performance.
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What to watch for
- ▸6-magnet rotor reached 730-750 RPM steady at 12 volts
- ▸RPM range improved slightly over the 12-magnet setup (680-720)
- ▸Amp draw dropped by about 1 amp compared with 12 magnets
- ▸Magnetic levitation raised the rotor about half a centimeter
- ▸Efficiency favored the 6-magnet configuration despite similar top speed
- ▸Next test will drop to 4 magnets to check the fewer-magnets-equals-higher-RPM idea
Watch the full long-form video on YouTube — that's where the full bench audio, runtime, and experiments live.
Experiment notes (read while you watch)
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In this bench test I swapped from a 12-magnet rotor down to 6 magnets on the same pulse motor setup. Running at 12 volts with 20-gauge drive and 30-gauge trigger bifilar coils, the rotor hit a steady 730-750 RPM while drawing fewer amps than the 12-magnet version. I also talk about the magnetic levitation effect that raised the rotor slightly when the weight dropped.
Key takeaways
- 6-magnet rotor reached 730-750 RPM steady at 12 volts
- RPM range improved slightly over the 12-magnet setup (680-720)
- Amp draw dropped by about 1 amp compared with 12 magnets
- Magnetic levitation raised the rotor about half a centimeter
- Efficiency favored the 6-magnet configuration despite similar top speed
- Next test will drop to 4 magnets to check the fewer-magnets-equals-higher-RPM idea
I ran the 6-magnet rotor at 12 volts today and the thing took off faster than the full 12-magnet version. The coils are 20 gauge drive wire paired with 30 gauge trigger. First spin gave me a tach reading right around 734 RPM and after a quick battery swap on the meter it settled at 736-750. That's a bit higher than the 680-720 range I got with all 12 magnets on there.
The motor draws noticeably fewer amps now, about a full amp less at 12.2 volts. Even though top speed isn't dramatically different, the efficiency seems better with six magnets. I also noticed the rotor is now riding a little higher because of the magnetic levitation setup I have with the stacked flanges. With less weight it lifts about half a centimeter off the lower flange.
I stopped and restarted a couple times to get clean readings. One time the circuit board fell off the table and I had to kill the power quick so the clips wouldn't short. After that everything read consistent across the board. The transistors are monopolar MPN type and the whole thing feels pretty synchronous no matter how I connect it.
Next up I'm swapping to the gyro rotor with only four magnets to see if fewer magnets really does push the RPMs higher every single time or if there's more going on. So far six magnets feels like the sweet spot for efficiency.
Related on this site
- Pulse Motor Rotor Design: Magnets, Materials and Balance — Directly supports discussion of changing magnet count and magnetic levitation height
- How to Maximize RPM on Your Pulse Motor — Reader can continue learning how to tune rotor speed after seeing these real measurements
- Best Wire Gauge for Pulse Motor Coils (AWG Guide) — Explains the 20 and 30 AWG bifilar coil choice used in this test
- Pulse Motor vs Bedini Motor: What's the Difference? — Context for the monopolar MPN transistor circuit shown
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*Generated from video transcript (hash `dd3f8709cccb…`).*
Full transcript (3,636 chars · en)
hello ladies and gentlemen what's up this is Papa Bale and this is the second video in my series about magnets on the rotor basically so we've it's this 12 magnet rotor has 12 slots I've removed six magnets from it now and now we have six magnets on and we're going to test it at 12 volts the coils are 20 gauge drive and 30 gauge trigger all right here we [Music] go oh we're already going faster than we were with the 12 holy smoke that is unbelievably fast I'm kind of nervous actually all right I'm going to get a quick Tech reading 700 just to see where it's going oh looks like it's slowing down I know that can't be right I wonder if I swap the battery out on the TAC meter what will happen [Music] yeah so it's saying it's registering about the same right around the range of 700 it's monopolar MPN transistors oh there we go 734 I don't know should I spin it up again think I might be able to spin it the wrong way do you think I don't know we are drawing fewer amps though all right I'm going to stop it real quick we're going to start it up again it's down to [Music] zero yeah all right so we're going to spin it from this side which I like to do and put it up to 12 again all right here we go [Music] 7:36 wow so 7:30 steady so that would make the range between 700 and 750 I'd say that's a little bit better than 680 to 720 is it significantly better I don't think so maybe it's the way that I've uh done all my connections and stuff that's making it pretty much synchronous across the board um we're going to do two more readings on that though that's how many amps are being drawn on two uh 12.2 volts [Music] oh no we got to cut the power quick about it too cuz my circuit that's built on my transistor just fell off the table and if any of those clips like touch [Music] looks like we're good across the board yep we're good all right all right so that is a six magnet test and it went about 750 730 sweet okay so in the next test we're going to do four magnets on the rotor and I'm going to swap out this rotor for the rotor right there on the gyro so I'd say they're about equal I don't know why but they're about equal uh you do draw more amps though about a whole amp more with the 12 magnets and the RPMs are about the same so I say six comes out on top on that one uh just due to the efficiency it's not much faster it's just more efficient and it might be because it's now mag left and it's a little higher than it was before cuz the weight of the 12 magnets kept it down I'll show you the mechanism that I'm using see there's two flanges stacked on top of each other right there and when there's enough weight it'll just rest on the flange right there but when there's not it'll be magl just because that's the way it worked out so it is mag Liv right now and it is a tiny bit higher than in my opinion it should be so maybe uh that prejudices the experiment uh slightly you see it's only that much distance it's about uh half a centimeter but it does raise it a little bit all right thank you very much ladies and gentlemen peace out have a good day Please Subscribe and the next video will be four magnets we're going to see if like uh it's just written in stone that fewer magnets means more RPMs that's my point that I'm trying to make here is that true is that just written in stone and that's the truth or is there some more to it than that you know we're going to find out so far it's about equal with 12 magnets we got a range from 680 to 720 and with six magnets we got a range from 730 or like 720 to 750 all right we're going to do four now and'll be right back thank you very much peace out bye now
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