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.

Litz Wire vs Standard Magnet Wire for Pulse Motors

A common question among advanced builders is whether to use litz wire instead of standard solid magnet wire. Here's what you need to know:

What is Litz Wire?

Litz wire consists of many thin, individually insulated strands woven together. Unlike single-strand wire, litz wire reduces the "skin effect" — the tendency of high-frequency currents to flow only near the surface of a conductor. In pulse motor applications where the coil switches rapidly, this can matter.

When Litz Wire Makes Sense

• High-frequency switching — If your motor runs at high RPM with many magnets, the pulse frequency increases and litz wire's advantages become more significant
• Pickup coils — For coils designed to capture back EMF rather than drive the rotor, litz wire (especially 26AWG litz) can improve high-frequency response
• RF-sensitive applications — Litz wire produces less electromagnetic interference

When Standard Magnet Wire is Better

• Drive coils — For the main energizer coil, solid wire is typically preferred for its mechanical robustness and ease of winding
• Budget builds — Litz wire costs significantly more than standard magnet wire
• Low-RPM motors — At typical pulse motor speeds, the skin effect is minimal and litz wire offers little advantage

See our detailed 26AWG litz wire voltage guide for specific measurements and comparisons.

Understanding Coil Resistance and Turn Count

The resistance of your coil directly affects how much current flows and how much heat is generated. Here's a practical guide:

Resistance Targets by Application

Calculating Turn Count

The number of turns you can fit depends on wire gauge and bobbin size. As a rough estimate:

• 16AWG: ~5-8 turns per linear inch of bobbin length
• 20AWG: ~10-15 turns per linear inch
• 22AWG: ~15-20 turns per linear inch
• 24AWG: ~20-30 turns per linear inch

Multiply by the number of layers you plan to wind. Remember: more turns = more inductance = higher back EMF voltage, but also higher resistance.

Complete AWG Comparison for Pulse Motor Applications

Frequently Asked Questions About Wire Gauge Selection

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.