Product Description:

The P21NRXB-LDN-PD-00 is a two-phase stepper motor manufactured by Pacific Scientific within the POWERMAX II P Motors series. Designed for motion control tasks in automated equipment, it converts commanded pulse trains into discrete rotary positions so actuators, tables, or small conveyors can index accurately. The unit follows NEMA mounting conventions, uses a double smooth shaft for coupling flexibility, and carries Class B insulation rated to 130 °C to withstand the thermal rise that accompanies repetitive start-stop duty cycles common in positioning applications.

The electrical values support fast current response during indexing duty. Parallel-connected windings draw 4.6 A DC per phase and have a coil resistance of 0.32 ohms, while the inductance is 1.1 mH; this low L/R ratio permits rapid current rise for quick torque production. At standstill, the motor develops 0.79 N-m of holding torque and exhibits a detent torque of 0.028 N-m when de-energized. Each full step equals 1.8 degrees, and step accuracy remains within ±1.5%, providing predictable micropositioning when combined with electronic subdivision. Its two-phase architecture, single internal stack, winding type B, and standard rotor support this performance, and the insulation withstands 340 V DC with 100 MΩ isolation resistance.

The frame conforms to NEMA 23, measures 57.15 mm square and 52.3 mm long, and can absorb 58 N axial and 89 N radial shaft load through a 6.35 mm diameter shaft that is double-ended and ground smooth. Total rotor inertia is 1.186 × 10⁻⁵ kg·m², and the motor provides 200 full steps per revolution for standard stepper resolution. Standard construction, a single receptacle with regular lead wires, and NEMA mounting holes simplify wiring and alignment. Operation is allowed from -20 °C to +40 °C, and Class B insulation keeps the windings within thermal limits during normal service.