Product Description:

The S33HNAA-RNVM-00 brushless servo motor is manufactured by Pacific Scientific for the S Brushless Motors series. It is a 6-pole neodymium magnet unit intended for precise torque delivery in industrial automation where smooth, low-cogging rotation is required. The motor follows the NEMA frame mounting standard and uses a size 21 frameless resolver with digital drives to report rotor angle during closed-loop operation. A secondary feedback channel is omitted, which helps keep the package compact and reduces the number of conductors routed from the motor.

During continuous stall conditions, the shaft can supply 5.3 Nm of torque, and short-duty peaks can reach 15.3 Nm without loss of synchronism. Drive current converts to mechanical output through a torque constant of 0.9 Nm/ARMS, allowing the control system to relate commanded current to delivered torque with a direct scaling factor. A line-to-line inductance of 6.3 mH helps smooth current ripple, while a winding resistance of 2.1 ohms sets the baseline for copper loss under load. The rotor inertia is 0.48 × 10^-3 kg·m², which supports predictable acceleration behavior, and the voltage constant of 0.56 Vrms/rad/s indicates the back EMF the amplifier must overcome as speed rises.

The motor uses a NEMA 34 frame outline and a 3-stack length, giving it a compact footprint with enough magnetic volume for demanding servo axes. Its mass is 6.5 kg, which suits medium-load installations without making the assembly excessively heavy. A 24 V dc brake secures vertical loads when power is removed, while a Viton shaft seal helps protect the rotating interface from contamination. H-type windings support operation at elevated temperatures common in tight cabinets, and power and resolver conductors exit through a motor-mounted MS connector to simplify wiring and reduce strain at the cable entry point.