S31SSNA-RNNS-02 Pacific Scientific
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The Pacific Scientific S31SSNA-RNNS-02 is a 6-pole Neodymium magnet brushless servo motor from the S Brushless Motors series with a NEMA 34 frame size and stack length of 1. It provides a continuous stall torque of 2.2 Nm and a peak torque of 6.2 Nm, with a motor weight of 3.2 kg. The motor uses a size 21 frameless resolver for primary feedback and has no brake or shaft seal.
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Product Description:
The S31SSNA-RNNS-02 is a brushless servo motor manufactured by Pacific Scientific within the S Brushless Motors series. It is intended for industrial automation where precise velocity and torque regulation are needed to drive positioning tables, robotic joints, and compact conveyors. The motor provides stable torque production while keeping the housing dimensions suitable for space-limited machine frames. It pairs directly with compatible digital amplifiers, allowing closed-loop motion control without additional interface hardware.
This model can sustain a continuous stall torque of 2.2 Nm, giving actuators predictable load-holding capability at zero speed. The mechanical envelope follows the NEMA 34 frame standard, so the flange and pilot diameter align with common U.S. servo gearheads and brackets. During rapid acceleration, the motor can reach a peak torque of 6.2 Nm, allowing fast cycle starts before thermal limits are approached. Position feedback is delivered by a Size 21 frameless resolver, which provides rotor angle feedback while tolerating electrical noise. Dynamic response is influenced by a rotor inertia of 0.18 ×10⁻³ kg·m², and this low value lets the drive change speed quickly with minimal overshoot. The overall assembly weighs 3.2 kg, which helps limit added mass on moving axes such as robot wrists or gantry sliders.
The motor uses a stack length of 1 Stack, which is the shortest lamination pack available in this frame. For holding duties, the motor is supplied with no brake, so external clamping or drive torque must maintain position when power is removed. Its magnetic circuit uses a 6-pole Neodymium magnet design, supporting high power density in a compact package. The housing is delivered without a shaft seal, and there is no secondary feedback channel. This layout is suitable for installations where ambient contamination is controlled.
Frequently Asked Questions about S31SSNA-RNNS-02:
Q: What NEMA frame size does the S31SSNA-RNNS-02 motor use?
A: This motor is a NEMA 34 size, allowing it to fit industry-standard mounting and dimensional requirements.
Q: What is the continuous stall torque rating of the S31SSNA-RNNS-02?
A: The S31SSNA-RNNS-02 offers a continuous stall torque of 2.2 Nm for sustained performance.
Q: What type of primary feedback device is included with the S31SSNA-RNNS-02 motor?
A: This model is equipped with a size 21 frameless resolver as the primary feedback device for position and speed sensing.
Q: Does the S31SSNA-RNNS-02 motor have a holding brake?
A: No holding brake is included in this motor, so it does not provide braking when power is removed.
Q: What is the peak torque for the S31SSNA-RNNS-02 motor?
A: The S31SSNA-RNNS-02 motor has a peak torque capability of 6.2 Nm for brief periods of operation.
