Product Description:

The P21NRXA-LSS-NS-00 is a hybrid stepper motor produced by Pacific Scientific as part of the POWERMAX II P Motors series. In automated positioning stages, labelers, or indexing tables, this motor converts pulse commands from the drive into precise rotary steps that can be multiplied through gearing or coupled directly to loads. Its NEMA mounting interface allows the motor to fit other 23-frame stepper installations without requiring changes to the mechanical layout.

The motor advances by a step angle of 1.8 degrees, producing 200 discrete steps per revolution with a maximum linear deviation of ± 1.5%. These motion characteristics come from a laminated rotor with a single magnetic stack. The housing conforms to the NEMA 23 frame code, while the shaft runs on a ball bearing with a 30 mm race diameter for axial stability and long service life. Heat from the A-type windings passes through the stator to the frame with a thermal resistance of 5.5 °C/W, so airflow or a heat-sinked mounting surface is recommended for continuous high-load duty. Electrical connections are provided through regular leadwires with a mating receptacle, allowing quick disconnection. No feedback devices are installed, so position is determined by step count alone.

Insulation strength is supported by an armature system rated for 340 Vdc impulse withstand and a leakage path of 100 Megohms at ambient conditions; both values align with Class B insulation materials that tolerate winding temperatures up to 130 °C. The motor can start and run in ambient temperatures from −20 °C to +40 °C without derating, provided moisture is controlled. A standard rotor design, single-stack lamination, and the absence of an encoder reduce part count and keep the assembly straightforward. The NEMA mounting style and leadwire connection method also keep installation simple and familiar.