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Planetary Gearbox — Torque Summing

Two motors driving a common output through an epicyclic gear train

Sun Gear (Motor A)
Ring Gear (Motor B)
Planet Carrier (Output)

Motor A — Sun Gear

Speed200 RPM
Torque50 Nm

Motor B — Ring Gear

Speed200 RPM
Torque50 Nm

Output — Planet Carrier

Speed
200RPM
Torque
100Nm

Presets

How It Works

Nout = (Nsun·Zs + Nring·Zr) / (Zs + Zr)

The planetary set sums the two inputs weighted by tooth count. Torques add at the output. If one motor fails, the other still drives — at a different ratio.

Sun: 24T  |  Planets: 18T  |  Ring: 60T