Product Description:

The P21NRXA-LSS-NS-02 is a two-phase stepper motor produced by Pacific Scientific and belongs to the POWERMAX II P Motors series. Built with NEMA mounting provisions, this NEMA 23 frame unit converts discrete pulse commands from an indexer or PLC into precise rotary motion for positioning, metering, or indexing duties on automated machinery. It relies on magnetic detents rather than feedback devices, so it is suited for open-loop control applications.

Electromechanical output is anchored by a 0.81 Nm holding torque generated from a single-stack rotor and stator set. Each full step advances the shaft by 1.8 degrees, and the step accuracy of ±1.5% supports repeatable move increments. The phase windings draw 5.6 A in bipolar parallel connection and present a resistance of 0.46 Ω, while 0.8 mH inductance shapes current rise time for microstepped operation. Winding type A conductors are insulated to Class B 130 °C, enabling continuous service as long as the surface temperature remains below the specified ceiling. These electrical characteristics allow the motor to pair directly with high-current chopper drives that supply up to 340 VDC across the insulation system.

The motor has an IP23 housing that blocks fingers and moderate airborne contaminants, and it sustains operation from -20 °C to +40 °C ambient. Static detent torque is 0.03 Nm, providing limited resistance to back-driving when power is removed, while a full revolution is divided into 200 discrete steps for fine incremental positioning. Additional attributes include insulation resistance of 100 MΩ, a maximum case temperature of 95 °C, standard rotor construction, a regular leadwire connection through a receptacle, standard construction materials, and no encoder for feedback. The single-stack architecture, NEMA mounting pattern, and A-type windings simplify integration into compact motion axes where rapid installation and straightforward cabling are priorities.