Product Description:

The P21NRXA-LNN-NS-00 is a hybrid stepper motor produced by Pacific Scientific as part of the POWERMAX II P Motors series. Designed for incremental motion axes in packaging, semiconductor, and light assembly equipment, the unit advances the shaft in 1.8-degree full steps, giving 200 discrete positions per revolution. Its two-phase winding architecture makes it compatible with standard bipolar drives and supports precise open-loop positioning without closed-loop sensing complexity. That layout suits repeatable indexing, feed, and transfer motions where the controller tracks position by commanded steps.

Built on a NEMA 23 frame, the motor uses standard mounting flanges and a NEMA pilot for straightforward mounting. The single-stack lamination gives it a 52.4 mm body length and a mass of 0.68 kg, while rotor inertia of 0.012 × 10⁻³ kg·m² suits moderate acceleration profiles in compact axes. A smooth single shaft is provided for couplings, and regular leadwires terminate in a receptacle for simple wiring. Internally, Class B insulation rated 130 °C supports a surface temperature ceiling of 95 °C, and insulation resistance remains 100 MΩ at 340 Vdc hipot. The standard construction uses dust-protected openings and carries an IP23 enclosure rating. The A-type winding draws a per-phase current of 5.6 A, produces a static holding torque of 0.81 Nm, and has a winding resistance of 0.46 Ω. Operation is permitted from -20 °C to +40 °C.

Inductance of 0.8 mH supports quick current rise during step changes and helps the motor respond cleanly to modern drives. A detent torque of 0.03 Nm keeps unpowered shaft drag low, and step accuracy is held to ±1.5% for repeatable indexing. The motor uses no feedback, so position control depends on commanded steps and proper load matching rather than an encoder or resolver. This arrangement keeps the electrical package simple for applications that rely on predictable motion profiles.