I Finally Got My Pulse Motor Running (Magnet Rotor)

Hook

I finally got my pulse motor running again and this time the magnet rotor is doing exactly what I wanted. It spins, makes kinetic energy on one end and real electricity on the other. Nothing fancy, just a tabletop toy that lights a 35 watt bulb while I watch the numbers.

Watch this experiment

You see the 9 in N magnet rotor spinning nice and steady. We’re feeding it 7 and a half volts at 1.2 amps. On the output side the mid-size coil (about 12,000 turns) and the bigger 22,000 turn coil are putting out 11 to 15.4 volts even with the bulb connected. The scope shows roughly 350 spikes and frequency stays below 100 Hz at 89.2. It’s AC by the time it reaches the generator coils even though the input is DC.

What you'll learn

You’ll see exactly how the magnet rotor drives both motion and generation. I talk about why the external coil works better as a trigger, what the coil wire is made of, and why I treat this as a fun toy instead of a world-changing machine. All numbers come straight from the bench.

From the bench

The setup is modular so I can swap parts quick. The drive coil is a four-filer of 26 gauge wire with each strand at 215 turns plus a 32 gauge strand of the same length all hooked into the drive. Generator coils are 12k and 22k turns. The whole thing runs at 7.5 V and 1.2 A while lighting the 35 W bulb. When I try to load it with anything heavier than very fine copper wire the rotor lets it stop pretty quick.

How it works / what we changed

This run uses the external coil as the trigger for the drive. I’ve tried both ways and the external coil works way better. No need for a bigger bobbin or miles of extra copper. Total turns on the external coil are about 860. That’s really just 215 turns depending on which strand you count. The energy goes straight from the drive to the output with very little in between. I’m not chasing potential energy or trying to break physics. I’m just playing with it and documenting what I see.

Rotor let take

The rotor let take is simple. This 9 in N magnet rotor will stop really quick if you try to make it spin anything more than a very fine copper wire. That tells me the mechanical power is limited. It’s happy lighting the bulb but don’t ask it to turn a heavy load. That matches what I measured: it keeps spinning under the 35 watt load but any extra drag and it quits fast.

Coil wire

The coil wire on the drive is four strands of 26 gauge plus one strand of 32 gauge, each the same length and 215 turns. The generator coils use much finer wire with 12,000 turns on the mid-size one and 22,000 on the larger one. That’s a lot of coil wire but it gives me the 11-15.4 volts I’m seeing on the meter. I keep the strands separate so I can choose which one I’m touching when I test for shocks.

External coil

The external coil is the trigger coil for the drive and it works way better than having it inside the coil. I’ve done it both ways. Using the external coil means I don’t need a bigger bobbin or a ton more copper. Total turns on this external coil are around 860. That small amount still gives strong results and clean triggering. I say try it because I already tested both setups and this one wins for what I’m doing.

Builder checklist

• Start with a 9 in N magnet rotor balanced well
• Wind drive coil: 4×26 ga + 1×32 ga, 215 turns each
• Add two generator coils (12k and 22k turns)
• Mount external coil separately as trigger
• Measure input at 7.5 V 1.2 A before adding load
• Use fine copper wire only for any mechanical take-off
• Check frequency stays under 100 Hz and spikes around 350
• Have a meter ready for the 11-15.4 V output

Troubleshooting

If the rotor stops quick, make sure you’re only using very fine copper wire for any load. If triggering is weak, move the external coil farther out instead of burying it inside the main coil. Voltage sagging under load? Check that the 22k turn coil is still connected properly. Readings jumping around? Remember it’s AC on the output side so set your meter accordingly.

Safety

This thing will shock the hell out of you if you grab it the wrong way. I’ve zapped myself touching all five strands at once. Treat it like sticking your finger in a light socket. There’s not six miles of copper between you and the energy, just 860 turns or less. Keep one hand in your pocket and don’t try to “improve” it while it’s running.

FAQ

Is this free energy? No. I’m putting in 7.5 volts at 1.2 amps and getting out electricity plus heat and motion. It’s a toy, not a breaker of physics.

Why use an external coil? It works better than putting the trigger inside the main coil. Less copper, smaller bobbin, better results in my tests.

How many turns do I really need? I got good numbers with 215 turns per strand on the drive and 12-22k on the generators. More isn’t always better once the gradient gets ridiculous.

Can I drive a mechanical load? Only very fine copper wire. Anything heavier and the rotor lets take stops fast.

Related on this site

• How to Build a Pulse Motor: Complete Beginner's Guide
• Pulse Motor Rotor Design: Magnets, Materials and Balance
• How to Wind Coils for a Pulse Motor (Step by Step)
• Best Wire Gauge for Pulse Motor Coils (AWG Guide)
• Understanding Back EMF in Pulse Motors

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