SBAC90 1275mm Motor Up Servo 3:1 Gearbox with Brake

SBAC90 1275mm Motor Up Servo 3:1 Gearbox with Brake is a SBA90 / SBAC90 belt actuator with 1275 mm of travel, a NEMA 34 servo motor, a 3:1 planetary gearbox, an absolute encoder and an integral brake. List price $2,950, 6-8 weeks lead time.

How the engine sizes it

Every build runs this actuator through the deterministic sizing engine: payload-at-speed against the family envelope, a 2× load safety factor as a hard gate, and the motor checked for at least 25% torque margin at your commanded speed on real torque-curve data (servo continuous curves at 48 V). Inertia mismatch above 10:1 triggers a computed gearbox remedy. The result ships with the math shown.

Ask for it by name in the engine, or describe the task and let the engine decide whether this is the right part — it will tell you if a smaller or larger variant fits better, and why.

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