Why use litz wire instead of regular wire for pickup coils?

Litz wire's multi-strand construction reduces the skin effect — the tendency of high-frequency AC to flow only on the surface of a wire. This makes litz wire more efficient for capturing the rapidly changing magnetic fields from a spinning rotor, resulting in higher output voltage at lower current.

What Voltage Does a 26AWG Litz Wire Coil Produce?

Q: What voltage does a 26AWG litz wire coil produce?

Papa Bale measured up to 9V with 220mA output from a 12-strand 26AWG litz wire pickup coil positioned near a spinning pulse motor rotor. Results vary based on rotor speed, magnet strength, coil turns, and distance from the rotor.

This is one of the most common questions from builders who've watched Papa Bale's litz wire coil experiments: exactly how much voltage and current does a 26AWG litz wire pickup coil actually produce? Here's the definitive answer based on Papa Bale's measured results.

⚡ The Short Answer

Papa Bale measured up to 9V open-circuit voltage with 220mA short-circuit current from a 12-strand 26AWG litz wire pickup coil positioned approximately 5–10mm from a spinning pulse motor rotor equipped with neodymium magnets.

The Exact Setup

The results don't come from thin air — the output of any pickup coil depends heavily on the specific configuration. Here's what Papa Bale used:

Parameter	Value
Wire type	12-strand litz wire, 26AWG each strand
Coil configuration	Pickup coil (not drive coil)
Position	~5–10mm from rotor surface
Rotor magnets	Neodymium, N42/N52 grade
Measured voltage (open circuit)	Up to 9V AC
Measured current (short circuit)	220mA
Measurement instrument	Digital multimeter + oscilloscope

Why Litz Wire Produces More Voltage

A regular 26AWG solid wire and a 12-strand 26AWG litz wire have the same total cross-sectional copper area, but they perform very differently in this application. Here's why:

The skin effect causes alternating current to flow primarily near the conductor surface at high frequencies. The rapidly changing magnetic field from a spinning rotor creates effectively high-frequency induction in the pickup coil. In a solid wire, much of the conductor's cross-section is "wasted" — the current can't flow through the center efficiently.

Litz wire's multiple individually-insulated strands force current to distribute across all strands, dramatically reducing effective resistance at frequency. This means more current can flow for a given induced voltage, increasing output power.

Variables That Affect Output

Papa Bale's 9V/220mA measurement represents a specific configuration. The output will vary based on:

Rotor speed — faster rotation = faster field changes = higher frequency = higher induced voltage
Magnet strength — N52 will produce more than N42 for identical setups
Number of coil turns — more turns = higher voltage but also higher resistance (trade-off)
Coil-to-rotor distance — closer = stronger coupling, but risk of mechanical contact
Number of strands — 12-strand vs. 4-strand makes a measurable difference
Core material — air core vs. ferrite core changes inductance and coupling efficiency

What Can You Do With 9V/220mA?

9V at 220mA is approximately 2 watts of power from the pickup coil alone. With a bridge rectifier converting the AC to DC, this is enough to:

Charge a small 9V battery
Power an LED array (14–20 standard LEDs)
Trickle-charge a lithium cell via a voltage regulator
Power low-draw microcontrollers or sensors

Remember: this output is in addition to the motor's mechanical rotation — it's recovered energy from the changing magnetic field, not taken from the drive circuit.

Replicate This Experiment

To replicate Papa Bale's results, use our free coil calculator to estimate the resistance and inductance of your pickup coil before winding, then compare your measured results. Share your numbers in the Discord community.