I Finally Got My Pulse Motor Running Better with 30 Gauge Coil Off

Hook

I bumped the power past 12 volts and suddenly my battery started charging on the SSG. The nine magnet rotor kept the whole thing spinning for minutes after I flipped the 30 gauge coil off. Flywheel action for the win.

Watch this experiment

You can see the cap bank jump, the voltage settle, and the rotor keep turning with almost zero change in sound.

What you'll learn

How a heavy rotor acts like a flywheel, why bridge rectifier pulse gives usable DC, and what really happens to voltage when the 30 gauge coil is switched off.

From the bench

I started the run at 11.85 V. With the SSG circuit and both 20-gauge and 30-gauge coils the cap bank (roughly 20 V rated) climbed fast – halfway there in just a couple seconds on the pulse motor. When I hit the power switch the meters dropped but leveled out near 12 V. The sound of the motor barely changed. Four or five minutes later it was still turning pretty fast even though it was slowing down. No clean RPM reading but the flywheel momentum was obvious.

How it works / what we changed

12 volts alone wasn't charging the battery no matter what I tried. Turning the power up changed that. The SSG circuit with the 30 gauge coil off still generated while the rotor kept momentum. Switching to the generator circuit pushed amps to 0.9 at 16.2 V and the battery charged faster. Every time I ran the test the final rested voltage ended up a little higher than the starting point.

Bridge rectifier pulse

I talked about generating some off-scale DC through a bridge rectifier. The coil makes AC and the bridge rectifier turns it into DC that I bet could light a bulb pretty bright just from the flywheel. In the test we were charging a cap bank with that pulse and watching the voltage climb even after the main power was cut.

Nine magnet rotor

This thing is basically a flywheel. It weighs like 3.5 to 4.5 lbs – about 2 lbs of plastic plus the nine neo cube magnets. That mass keeps it spinning for 5-10 minutes after you kill the power. The sound stays almost the same and sometimes it even seems to run a tiny bit faster right after switching off. I love the flywheel implications even if some builders try to get rid of them.

Coil off

When I turn the 30 gauge coil off the rotor keeps going with very little change in sound or speed at first. The cap bank and battery voltages drop but then level out. The cap seemed to stabilize while the battery continued a slow drain. Still, every test ended with a rested voltage a few tenths higher than where we started. The SSG with the coil off actually performed a bit better than the generator circuit in this setup.

Builder checklist

• Heavy nine magnet rotor (3.5+ lbs) for flywheel effect
• 20-gauge drive coil plus 30-gauge coil off for generation
• SSG circuit (combo circuit used here)
• Bridge rectifier on the output for DC charging
• Cap bank around 20 V rating to watch pulse charging
• Multimeters on battery and cap bank
• Safe distance – magnets become bullets above 1000 RPM

Troubleshooting

Battery not charging at 12 V? Increase input power. Voltage drops right after power off but should level higher than start. If it keeps draining, check connections and let it rest a couple hours to see the net gain. Sound change too big? Rotor balance or magnet placement may need work.

Safety

Neodymium cubes on a rotor above 1000 RPM can act like bullets if they let go. My brother already has PTSD from a previous rotor failure. Keep kids and faces away. Discharge caps safely. I have two kids so I'm extra careful with high-voltage discharge plans.

FAQ

Why does the voltage keep climbing after power off? The flywheel keeps the coil moving so the bridge rectifier pulse still feeds the cap bank for a while.

Is the 30 gauge coil off really generating? Yes – we saw the cap bank rise and the battery end higher than it started.

How long does the nine magnet rotor spin? Four to five minutes and still turning fast, up to 5-10 minutes total before it really slows.

Should I use the generator circuit or SSG? In this test the SSG with 30 gauge coil off charged the battery a little better, but the generator circuit gave higher amps.

Related on this site

• How to Build a Pulse Motor: Parts, Coil Gap, First Spin
• Bedini Motor & SSG Circuit Guide (Beginner Bedini Explained)
• Pulse Motor Rotor Design: Magnets, Materials and Balance
• Best Wire Gauge for Pulse Motor Coils (AWG Guide)
• Pulse Motor Battery Charging

Watch this experiment on YouTube

• ▶ Watch full on YouTube