S31HNNA-HSNS-02 Pacific Scientific
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The S31HNNA-HSNS-02 is a 6-pole Neodymium magnet brushless servo motor made by Pacific Scientific and is part of the S Brushless Motors series. It is built to the NEMA 34 frame size standard and weighs 3.2 kg. The motor features a continuous stall torque of 2.2 Nm, a peak torque of 6.2 Nm, and has a primary feedback device of Hall Sensor.
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Product Description:
Pacific Scientific manufactures the S31HNNA-HSNS-02 within its S Brushless Motors series. This unit is a six-pole neodymium-magnet brushless servo motor intended for closed-loop motion axes in packaging, material handling, and general automation. By combining rare-earth magnets with electronic commutation, the motor supplies repeatable torque without brush wear. The design supports compact, maintenance-free rotary actuation and fits common servo drive systems found on factory floors.
The motor delivers a continuous stall torque of 2.2 Nm, meaning it can maintain that load indefinitely at rated winding temperature without motion. When short bursts of acceleration or disturbance rejection are required, its peak torque capability rises to 6.2 Nm, providing nearly triple the continuous level for transient events. Electromagnetic dynamics are shaped by a line-to-line inductance of 10.3 mH, which limits di/dt and filters inverter switching edges for smoother current waveforms. Copper losses are set by the phase-to-phase resistance of 4.1 ohms, which sets steady-state heating at a given RMS current. Each ampere delivered by the drive produces 0.7 Nm/ARMS of torque, which helps with current-loop tuning and load matching.
A rotor inertia of 0.18 kg m² ×10⁻³ supports quick speed changes while helping servo loop stability, and the assembly mass of 3.2 kg keeps payload on gantry or robot axes low. The frame follows the NEMA 34 dimensional standard, so it installs on existing brackets without redesign. Back-EMF develops at 0.44 VRMS/rad/sec, enabling velocity observers to estimate speed accurately from voltage feedback. Position referencing relies on the embedded Hall sensor, and the single-stack H-type winding balances thermal rise with torque density. The design omits a holding brake and a shaft seal, reducing inertia and maintenance for dry indoor machinery.
Frequently Asked Questions about S31HNNA-HSNS-02:
Q: What is the continuous stall torque rating for the S31HNNA-HSNS-02 motor?
A: The S31HNNA-HSNS-02 motor has a continuous stall torque of 2.2 Nm, supporting moderate load applications that require sustained torque.
Q: What type of feedback device is included in the S31HNNA-HSNS-02 servo motor?
A: This motor uses a Hall sensor as its primary feedback device for position detection.
Q: Which NEMA frame size does the S31HNNA-HSNS-02 use?
A: The S31HNNA-HSNS-02 motor is constructed to the NEMA 34 frame standard, ensuring compatibility with standard mounting hardware.
Q: Does the S31HNNA-HSNS-02 motor come equipped with a holding brake?
A: A holding brake is not included in this model.
Q: What winding type does the S31HNNA-HSNS-02 brushless motor feature?
A: This model utilizes a winding type designated as 'H'.
