Product Description:

The P21NSXS-LSS-NS-05 stepper motor is produced by Pacific Scientific as part of the POWERMAX II P Motors series. This NEMA-framed device converts discrete electrical pulses into incremental rotation, allowing machine builders to position tooling, conveyors, or indexing tables without closed-loop feedback. This particular model is supplied with no feedback option, so the drive relies on commanded pulse counts. Within industrial automation, the motor functions as a torque source that holds position at each commanded step, supporting motion profiles that do not require servo feedback.

Mechanical interfacing follows the NEMA 23 outline, so the 56 mm square flange aligns with motion stages that use the NEMA mounting style. Each input pulse advances the rotor by 1.8 degrees, and after 200 pulses a full revolution is complete, giving a theoretical resolution of 200 discrete positions. A step accuracy of ±1.5% keeps cumulative error within tight limits for multi-turn moves. Insulation is rated to Class B, 130 °C, meaning the coil winding can operate safely to that temperature without loss of dielectric strength. The stator system shows an insulation resistance of 100 Megohms when tested at ambient conditions, limiting leakage current and supporting predictable phase impedance. A receptacle-style connector and standard construction simplify wiring and installation.

Maximum insulation withstand is 340 Vdc, adding margin when the drive uses high-voltage chopping techniques. The motor remains functional from -20 °C to +40 °C, covering most cabinet and factory floor climates. Two electrical phases produce the required rotating field, and their 90-degree offset interacts with the Neodymium-Iron-Boron magnets inside the standard rotor to deliver holding torque with minimal detent. This design uses a single stator stack, an octagonal housing that improves heat transfer, and a 30 mm bearing set that supports axial loads while preserving alignment. By keeping the phase count at 2, the drive electronics remain simple without sacrificing micro-stepping capability.