Product Description:

The P21NRXS-LNN-NS-13 is a two-phase stepper motor produced by Pacific Scientific within the POWERMAX II P Motors series for precision positioning tasks in automated machinery. It uses a regular lead-wire connection style that terminates in a receptacle, and the unit has a standard construction without feedback devices, as indicated by its no-encoder configuration and standard rotor. Mechanical integration follows the NEMA mounting style, with a 66.67 mm bolt circle, 5.08 mm holes, and a 38.10 mm pilot. The single smooth shaft is formed in one stack, matching installations that require compact axial dimensions and straightforward coupling.

This motor has a NEMA 23 frame size, giving a 56 mm square face that suits mid-frame indexers and small gantries. Each electrical step advances the rotor by 1.8 degrees, and the cumulative positioning error stays within ±1.5%, making it suitable for open-loop indexing. The stator windings use Class B insulation rated for 130 °C, leakage to ground remains below 100 megohms, and conductor integrity is protected up to 340 Vdc. Axial thrusts up to 13 lb and radial side loads of 20 lb can be applied without exceeding bearing limits, so pulleys or lead screws may be mounted directly. The service envelope extends from -20 °C to +40 °C, permitting use in unconditioned industrial environments.

The electromagnetic package is wound for 2 phases, so a full electrical cycle produces 200 discrete mechanical steps per revolution. Overall body length is 52.3 mm, which helps the motor fit into tight axial spaces while keeping mass close to the mounting face. A straight, smooth journal of 6.35 mm diameter extends 20.60 mm beyond the front flange to accept couplings or gears without additional machining. Because positional data are derived directly from commanded pulse counts, the unit works with micro-stepping or full-step drives.