I Ran an 8 Magnet Pulse Motor with Induction Coils Bedini-Style

Hook

I finally got the 8-magnet pulse motor spinning with three induction coils wired Bedini-style right behind the drive coils. We measured 23.3 volts coming off 12 volts in and even ran a second motor off the pickup. It was messy, it was fun, and the numbers are real.

Watch this experiment

I set the camera up, powered the three drive coils with 12 volts, and watched the rotor take off. The three induction coils behind them (linked in series) immediately started pumping out voltage. You can see the second 12-magnet rotor motor slow down as it loads the 26-gauge coils. At one point the whole base started sliding along with the spin — that was a surprise.

What you'll learn

You’ll see exactly how much voltage my induction coils produced, how the Bedini-style charge battery was hooked up, and what happens when you put a load on the pickup coils. I also talk about rotor balance, why it self-starts so easily, and the one part still missing from a full Bedini circuit.

From the bench

The motor is running on a horizontal shaft with eight magnets. Three drive coils are powered by 12 volts. Directly behind them sit three more coils — one for each drive coil — wired in series. The magnets pass only 3/4 inch away. I measured 23.32 V, then 23.33 V coming off those induction coils. That’s the raw number I got on the bench. No fancy math, just what the meter showed.

How it works / what we changed

This is a true Bedini style motor according to the classic circuit. The induction coils gather both the back-EMF from the drive coils and the flux from the passing magnets. I have a 100-ohm resistor in place but no potentiometer yet. The central wheel is so well balanced it barely needs a nudge to start. I straightened the sliding base and kept the gap tight. Later I plan to add eight more coils around the outside, each with its own trigger and drive strand.

Induction coils

I hooked the charge battery up exactly the way it would be in a Bedini circuit. The three induction coils in series feed that battery while the motor runs. With 12 volts on the drive side we saw 23.3 volts on the charge side. That’s the induction coils bedini-style charge working in real time on my bench. The second motor running off the 26-gauge wires also pulls from the same inductive kick.

8 magnet pulse motor

These induction coils bedini style sit literally right behind the drive coils. They’re picking up both the collapsing field from the drive windings and the moving magnetic field from the 8 magnets at 3/4 inch distance. When I let the second motor load the 26-gauge coils the main rotor slowed from roughly 20 V down to about 19.7 V on the meter. The induction coils bedini style kept working even under that extra load.

Bedini-style charge

My coils bedini style charge setup uses the exact same wiring a classic Bedini SSG would use for the charge battery. We’re missing only the potentiometer. The three series-linked pickup coils deliver the inductive spike straight to the charge battery. I watched the voltage sit steady at 23.3 V while the main rotor kept spinning and the secondary motor ran off the same coils bedini style charge output.

Builder checklist

• 8-magnet rotor on horizontal shaft, well balanced
• Three drive coils + three induction coils directly behind (3/4 inch magnet gap)
• 12 V input to drive coils
• Induction coils wired in series for higher voltage output
• 100-ohm resistor in circuit
• Charge battery connected Bedini-style
• Secondary 12-magnet rotor motor ready to load the 26-gauge pickup
• Glue gun (RIP) and hot glue for quick adjustments

Troubleshooting

Rotor started sliding the whole base in the direction of spin; I straightened it and re-glued. If balance is off above 2000 RPM the shaft will shake — mine is still good at normal running speeds. Voltage on the pickup dropped when the second motor loaded the coils; that’s expected. Glue gun popped and died mid-build; keep a spare handy. If the rotor won’t self-start, double-check trigger winding polarity and coil spacing.

Safety

Keep fingers clear of the spinning rotor and magnets. The voltage is low (12–23 V) but currents can still heat wires. Watch for hot coils under load. Hot glue guns get very hot and can pop — wear eye protection. Secure the motor base so it cannot walk off the table while running. Disconnect power before making wiring changes.

FAQ

How much voltage did the induction coils make? 23.33 V from a 12 V input.

Is this a real Bedini circuit? Yes, the charge battery is hooked up exactly the Bedini way; only missing the potentiometer.

Why did the second motor slow the main rotor? Loading the 26-gauge induction coils adds drag.

Will it self-start? Mine does almost every time because the central wheel is very well balanced.

What are you adding next? Eight more coils around the outside, each with drive and trigger strands.

Related on this site

• How to Build a Pulse Motor: Parts, Coil Gap, First Spin
• Pulse Motor vs Bedini Motor: What's the Difference?
• Bedini Motor & SSG Circuit Guide (Beginner Bedini Explained)
• Best Wire Gauge for Pulse Motor Coils (AWG Guide)
• Pulse Motor Battery Charging

Watch this experiment on YouTube

• ▶ Watch full on YouTube