Best Wire Gauge for
Pulse Motor Coils

Wire gauge is one of the most debated topics in the pulse motor community, and for good reason — it directly affects how your motor performs. Get it wrong and your coil either heats up excessively, lacks the magnetic field strength you need, or simply won't fit on your former. I've wound coils with multiple wire sizes and I want to share what I've actually learned, not just theory.

Why Wire Gauge Matters in Pulse Motor Coils

In a pulse motor, the coil performs two jobs: it generates a magnetic field when pulsed, and it collapses that field to produce back EMF. The wire gauge affects:

• Resistance — thicker wire (lower AWG number) = lower resistance = more current for the same voltage
• Inductance — more turns = more inductance, but thinner wire lets you fit more turns per layer
• Current capacity — thicker wire handles higher currents without excessive heat
• Magnetic field strength — higher current through more turns = stronger field
• Back EMF voltage — higher inductance (more turns of thinner wire) produces higher voltage spikes

AWG Quick Reference

Here's a quick comparison of the gauges most commonly used for pulse motor coil winding:

Papa Bale's Experience with 16AWG

My most-viewed pulse motor video features a 16AWG coil, and there's a reason for that. When I was designing a budget-friendly, beginner-accessible build, I wanted a wire that was forgiving — easy to handle, easy to wind without kinking, and capable of passing enough current to generate a serious magnetic punch even from a 12V battery.

16AWG magnet wire is thick enough that a beginner can wind it without frustration. It has low enough resistance that you don't need a high-voltage supply. And the resulting coil produces a satisfying electromagnetic kick that gets the rotor spinning reliably. The tradeoff: you won't fit as many turns on a given former, so your inductance is lower and your back EMF voltage spikes are more modest. For most builds, that's fine.

When to Choose Thinner Wire (20–22 AWG)

Thinner wire shines when you want to maximize your turn count and you're running from a higher voltage supply (24V–48V). With 500+ turns of 22AWG, you get significant inductance and higher BEMF spikes — which means more recoverable energy per pulse. If back EMF recovery is your main goal, a higher-turn fine-wire coil is worth the more tedious winding process.

The downside: thin wire is harder to wind uniformly, kinks easily, and has higher resistance meaning more heat per amp. You also need to be more careful about transistor current ratings. See my transistor guide for matching the right transistor to your coil.

Bifilar Winding and Wire Gauge

Bifilar coils (two wires wound simultaneously) add another consideration. See my coil winding guide for the full treatment, but briefly: when winding bifilar, you're doubling the wire in the coil window, so you need to size each wire one or two gauges thinner to maintain the same turn count. A bifilar 22AWG is roughly equivalent in fill to a single-wire 20AWG.

My Recommendation

For your first pulse motor coil: start with 20AWG. It's the golden middle — manageable to wind, enough turns for reasonable inductance, and current capacity sufficient for most 12V builds. Once you understand how your motor responds to coil changes, experiment with 16AWG for raw power or 22AWG for higher BEMF voltage.

Whatever you choose, wind it tightly, evenly, and secure it well. Sloppy winding wastes more performance than wire gauge choice ever will.