Product Description:

The S33HNNA-RNNM-00 is a 6-pole neodymium magnet brushless servo motor manufactured by Pacific Scientific for the S Brushless Motors series. It is intended for precision positioning and velocity control in automation axes that require repeatable motion, rapid acceleration, and accurate feedback to the drive or controller. Its motor design supports stable torque production and responsive speed changes in equipment that runs frequent indexing, tracking, and positioning cycles. The compact servo format also makes it suitable for machine layouts that need accurate rotary motion without oversized motor housings.

At continuous stall, the motor supplies 5.3 Nm of torque, while short-duration demand can rise to 15.3 Nm for rapid acceleration or temporary load changes. A phase-to-phase inductance of 6.3 mH helps moderate current rise, and a winding resistance of 2.1 Ω contributes to copper losses during operation. Rotor inertia is 0.48 × 10⁻³ kg·m², which helps the motor respond quickly to speed changes without excessive sluggishness. The motor uses an H-type winding and a 3-stack lamination arrangement, and it has no holding brake, so load retention at standstill must come from external means. It also has no shaft seal, which makes clean mounting conditions important, and the electrical power and resolver leads exit through a motor-mounted MS connector for compact cable routing.

A torque constant of 0.9 Nm/ARMS relates commanded current to output torque, and a back-EMF constant of 0.56 VRMS/rad/sec supports drive-side velocity calculation. Overall mass is 6.5 kg, which allows rigid installation without placing excessive load on the supporting machine structure. The primary feedback device is a Size 21 frameless resolver, and there is no secondary feedback device, so the feedback arrangement remains straightforward. The motor follows the NEMA 34 frame standard, so it fits mounting patterns associated with that frame size.