S21HNNA-HGNS-02 Pacific Scientific
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The Pacific Scientific S21HNNA-HGNS-02 is a 6-pole brushless servo motor from the S Brushless Motors series, designed with a NEMA 23 frame and a weight of 1.4 kilograms. It features a continuous stall torque of 0.5 Nm, peak torque of 1.36 Nm, and primary feedback by Hall sensor with a secondary 1024 ppr encoder. The motor uses H winding, has a shaft without seal, and includes no holding brake.
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Product Description:
Pacific Scientific manufactures the S21HNNA-HGNS-02 as part of its S Brushless Motors series. The unit is a six-pole neodymium-magnet brushless servo motor intended for closed-loop positioning tasks in automated pick-and-place systems, light conveyor applications, and small gantry axes. When paired with a compatible amplifier, it converts controlled current into mechanical torque so that motion profiles follow command signals precisely within industrial automation cells.
The motor delivers a continuous stall capability of 0.5 Nm, allowing it to hold a static load without overheating, while a peak output of 1.36 Nm is available for brief acceleration or disturbance rejection. Electrical performance includes a phase-to-phase resistance of 3.0 Ω, which affects steady-state current, and a line-to-line inductance of 3.7 mH, which influences current ripple during PWM drive operation. For every ampere of sinusoidal RMS current, the electromagnetic circuit produces 0.2 Nm/ARMS of torque, a value used to match the drive to the required torque bandwidth.
A rotor inertia of 4.2×10⁻⁵ kg·m² supports rapid speed changes while minimizing overshoot, and the assembly weighs 1.4 kg, which helps on lightweight axes. The housing follows the NEMA 23 frame envelope for straightforward mounting to standard gearheads or brackets, and its back EMF is characterized by a voltage constant of 0.13 VRMS/rad/sec for drive tuning. Primary feedback is provided by Hall sensors for commutation, and a 1024 ppr incremental encoder supplies secondary feedback for high-resolution position loops. The motor uses winding type H, has one stack length, and is supplied without a holding brake or shaft seal, making it suitable for applications where external mechanical restraints and additional sealing are not required.
Frequently Asked Questions about S21HNNA-HGNS-02:
Q: What is the continuous stall torque of the S21HNNA-HGNS-02 motor?
A: The S21HNNA-HGNS-02 delivers a continuous stall torque of 0.5 Nm.
Q: What primary feedback device is used in the S21HNNA-HGNS-02 brushless motor?
A: This model uses Hall sensors as the primary feedback device for motor commutation.
Q: What type of secondary feedback does the S21HNNA-HGNS-02 motor provide?
A: A 1024 ppr encoder with line driver output functions as the secondary feedback device on this unit.
Q: What mounting standard and size does the S21HNNA-HGNS-02 motor use?
A: The S21HNNA-HGNS-02 is built with a NEMA 23 frame size for standardized mounting.
Q: Is there a holding brake included with the S21HNNA-HGNS-02 servo motor?
A: This motor does not include a holding brake as part of its standard configuration.
