S22HSNA-RNNM-03 Pacific Scientific
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The Pacific Scientific S22HSNA-RNNM-03 is a 6-pole Neodymium magnet brushless servo motor from the S Brushless Motors series. It features a continuous stall torque of 1.0 Nm, peak torque of 2.64 Nm, and a NEMA 23 frame size. The motor weighs 1.9 kg and includes a size 21 frameless resolver as its primary feedback device.
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Product Description:
The S22HSNA-RNNM-03 brushless servo motor is produced by Pacific Scientific within the S Brushless Motors series. This compact 6-pole motor uses Neodymium magnets and serves as a torque source for positioning tables, pick-and-place axes, and other automation stages that demand precise motion control. Its frameless resolver feedback and standard mounting allow the motor to work with compatible digital drives for closed-loop regulation during repetitive duty cycles. Because the resolver is integrated into the motor, the control system can monitor rotor position continuously and keep motion synchronized during repeated start-stop cycles. The design is well suited to compact automation layouts that need predictable torque response without a large motor envelope.
Mechanically, the motor occupies a NEMA 23 frame, giving it a 2.3-inch square bolt pattern and accommodating the two-stack lamination package. A continuous stall capability of 1.0 Nm sustains static loads, while a peak output of 2.64 Nm supports short acceleration bursts during indexing and speed changes. The winding’s line-to-line inductance of 5.7 mH moderates current ripple, and a resistance of 4.2 ohms influences copper loss and the bus voltage required by the drive. Rotor inertia is limited to 0.064 kg·m² × 10⁻³, which helps the axis respond quickly, and the 1.9 kg mass together with the size 21 frameless resolver keeps the assembly relatively light. The NEMA footprint also helps it fit common brackets and adapter plates used in compact servo assemblies.
Electrical conversion factors complete the performance profile. A torque constant of 0.3 Nm/ARMS lets the drive map commanded current to torque output, while a voltage constant of 0.19 VRMS/rad/sec indicates the back EMF that rises with motor speed. Power and feedback conductors terminate through a motor-mounted MS connector, reducing loose on-machine wiring and keeping the interface compact at the housing. The motor is supplied without a shaft seal, without a secondary feedback device, and without a mechanical brake, while H-class windings support elevated operating temperatures during continuous industrial use. This simplified arrangement is useful where the axis does not require added sealing or brake holding and where a single primary feedback channel is sufficient for control.
