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🔧 Pulse Motor Coil Calculator
Free online tools for pulse motor builders — calculate wire resistance, current capacity, wire length, and coil inductance.
⚡ Tool A: Wire Resistance Calculator
Enter your wire gauge and length to calculate resistance, current capacity, and wire dimensions. Essential for sizing your drive coil correctly.
Papa Bale used 16AWG trifiler in his dual-drive coil — thick enough to handle the current surges without overheating. For pickup coils measuring back-EMF output, he switched to 26AWG litz wire to maximize voltage at lower current.
Results
Resistance
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Current Capacity
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Wire Diameter
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💡 Why it matters: Resistance determines how much current your coil draws. Too high = weak magnetic field. Too low = transistor overload and heat. Aim for 2–10Ω for most pulse motor drive coils.
🌀 Tool B: Coil Winding Estimator
Estimate wire length, resistance, and inductance for a coil before you wind it. Saves time and prevents running out of wire mid-build.
Papa Bale's proximity pickup coil used 28-gauge trifiler wire wound around a small core near the spinning rotor. Getting the number of turns right is critical — too few and the voltage is weak; too many and the resistance climbs. This calculator helps dial it in before winding.
Results
Wire Length (ft)
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Wire Length (m)
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Estimated Resistance
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Estimated Inductance
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💡 Inductance matters: Higher inductance = stronger back-EMF spike = more recoverable energy. But too much inductance with too few turns of thick wire means slow field collapse. For Bedini-style circuits, 1–10 mH (1000–10000 µH) is typical.
Want to see these calculations in action?
Papa Bale documents every build — including wire gauges, coil resistance, and real output measurements — on YouTube. Subscribe to watch it all unfold live.