Product Description:

The S21HNNA-HGNL-00 belongs to the S Brushless Motors series produced by Pacific Scientific. It is a 6-pole neodymium magnet brushless servo motor intended for closed-loop positioning or speed control in automated machinery such as pick-and-place modules, small conveyors, or metering pumps. When paired with a compatible drive, the motor converts electrical power into tightly regulated mechanical motion, allowing compact equipment to move loads smoothly and repeatably within NEMA-frame dimensions.

This model can deliver a continuous stall torque of 0.5 Nm and reach a short-term peak of 1.36 Nm for acceleration or disturbance rejection. The three-phase stator has an inductance of 3.7 mH and a line-to-line resistance of 3.0 Ohms; together, these values affect current rise time and copper losses that must be considered when sizing the drive amplifier. At just 1.4 kg, the motor adds minimal inertial load to moving axes, which benefits high-cycle machines. Primary feedback is provided by Hall sensors for commutation, while a secondary 1024 ppr incremental encoder with a line-driver output supports tighter velocity or position loops. The winding is the H variant, the magnetic stack length is one segment, and the unit is supplied with 18-inch flying leads for direct cable routing.

The mounting pattern uses the NEMA 23 envelope, which fits common mechanical layouts. Dynamic response is aided by a rotor inertia of 0.042 kg·m² × 10⁻³, giving a good balance between acceleration capability and load damping. A torque constant of 0.2 Nm/ARMS translates commanded phase current into predictable output torque, while the back-EMF slope is 0.13 VRMS/rad/sec, which the drive uses for flux estimation and field-oriented control. The motor lacks a shaft seal, so it should be mounted in environments free from liquid spray or abrasive dust. The lightweight rotor and Hall-plus-encoder feedback combination supports precise indexing and stable low-speed operation within motion subsystems.