Product Description:

The S33GNAA-RNNM-00 is a 6-pole neodymium-magnet brushless servo motor produced by Pacific Scientific for the S Brushless Motors series. A Size 21 frameless resolver provides primary feedback so the drive can close the position and velocity loops without an external encoder. This motor is used on packaging lines, material-handling axes, and light machining centers where accurate torque delivery and moderate inertia are important for repeatable motion. Its brushless design supports responsive control and reduces the maintenance associated with mechanical commutation components.

With the shaft locked, the motor sustains a continuous stall torque of 5.3 Nm, which sets its thermal limit during steady holding duty. For short periods of higher demand, it can deliver a peak torque of 15.3 Nm. Each ampere of phase current produces about 1.9 Nm/ARMS, which helps relate commanded current to expected output torque. The line-to-line resistance is 8.4 Ohms, and that value influences copper losses and the DC bus voltage needed for rated current. Line-to-line inductance is 25.2 mH, which helps smooth current response during PWM switching. Power, resolver, and brake circuits are routed through a motor-mounted MS connector to simplify wiring at the machine.

The assembly weighs 6.5 kg, which keeps the motor suitable for direct mounting on aluminum machine plates. Rotor inertia is 0.48 × 10⁻³ kg·m², helping the axis achieve short move and settle times when matched with an appropriate drive. A normally engaged 24 V DC brake holds vertical or suspended loads during power loss. Electrical commutation is supported by a back-EMF constant of 1.19 VRMS/rad/sec. The motor follows the NEMA 34 mounting standard, has no shaft seal, and does not include a secondary feedback device. These features make it suitable for installations that need compact mounting, integrated holding capability, and straightforward electrical connection.