Product Description:

The P21NRXB-LNS-NS-07 is a two-phase stepper motor manufactured by Pacific Scientific for the POWERMAX II P Motors series. By advancing the rotor a fixed increment each time the drive issues a pulse, it delivers predictable positioning for indexers, labeling heads, and small gantries. A single rotor stack and standard construction keep the unit compact while still providing the torque required for moderate inertial loads in general automation.

This winding type B unit is wound for parallel connection, and under that scheme the rated phase current is 4.6 A. The copper path presents only 0.32 Ω of DC resistance, allowing rapid current rise, while phase inductance measures 1.1 mH, which helps maintain stable microstepping. Each full step advances exactly 1.8 degrees, producing 200 discrete shaft positions with a step accuracy of ±1.5%. When both phases are energized, the motor can hold a stationary load of 0.79 Nm, while detent torque without excitation is 0.028 Nm, so holding current is required for stiff positioning. The absence of an internal encoder simplifies the drive electronics but requires open-loop tuning, and the electrical insulation is Class B to 130 °C with dielectric strength up to 340 VDC and 100 MΩ isolation between the windings and frame.

Mechanically, the motor occupies the standardized NEMA 23 frame envelope with a width of 57.15 mm and a body length of 52.3 mm, allowing direct NEMA flange mounting. A single-ended shaft facilitates coupling to belts or lead screws, the rotor uses the standard magnetic geometry for the series, and regular lead wires terminate at a receptacle connector. Protection is rated IP23, so the enclosure resists accidental finger contact and sprayed water but should be installed inside a cabinet in dusty or washdown areas. The maximum surface temperature is 95 °C, and ambient operation is limited to -20 °C to +40 °C.