Product Description:

The S33ANNH-RNUM-00 belongs to the S Brushless Motors series manufactured by Pacific Scientific. It is a 6-pole neodymium magnet brushless servo motor for closed-loop positioning and velocity tasks in industrial automation cells, pick-and-place gantries, and precision tooling axes where compact NEMA-frame actuators are preferred. Its brushless construction supports repeatable motion control without the wear associated with mechanical commutation, which suits applications that cycle frequently. A size 21 frameless resolver provides primary feedback, so the motor sends rotor position data to digital drives without relying on optical sensors that can be more sensitive to contamination.

During continuous duty, the rotor can deliver 5.3 Nm of stall torque, while transient moves can use a peak capacity of 15.3 Nm. This output comes from the A-class winding, which produces 1.5 Nm/ARMS per phase. The three-stack stator has a line-to-line inductance of 17.0 mH, so current rise is moderated and ripple is reduced at high switching frequencies. Phase-to-phase resistance is 5.2 ohms, which helps estimate thermal loading under square-wave excitation. This electrical combination supports predictable current response when the motor is paired with a compatible servo amplifier. The motor is built for use with 320 VDC bus drives, and it does not include a holding brake. Power and resolver leads exit through a motor-mounted MS connector.

The rotor’s inertial load is 0.48 kgm² × 10⁻³, giving the actuator short acceleration times when coupled to low-mass mechanics. Overall mass is 6.5 kg, which helps the unit remain manageable on moving axes while still providing thermal mass. The housing complies with the NEMA 34 frame standard, so it bolts directly to most inch-based gearheads and adapter plates without custom machining. Back electromotive force is quantified by a voltage constant of 0.94 VRMS/rad/sec, which helps match amplifier voltage limits to top speed. There is no secondary feedback device, and motion retention must be handled by control logic or external clamps.