Product Description:

The P21NRXD-LDN-NS-00 is a two-phase stepper motor manufactured by Pacific Scientific for the POWERMAX II P Motors series. It supports incremental motion control in pick-and-place stations, index tables, and other automation stages that need open-loop accuracy because the model is supplied with no feedback encoder. Built in NEMA 23 frame dimensions, the unit features standard construction with a standard rotor and mounts through the NEMA pattern. A double, smooth 6.35 mm shaft exits the housing to simplify coupler alignment on either side, and power reaches the windings through a regular leadwire receptacle connection.

With a body length of 52.4 mm, the motor occupies minimal panel depth while still providing a holding torque of 0.77 Nm at its single-stack magnetic circuit. The two windings draw 1.5 A each, and the D-type coil design presents 10.3 mH of inductance, a combination that shapes current rise time for smooth acceleration. Motion granularity comes from its 1.8 degrees step angle, yielding 200 full steps per revolution and a step accuracy of ±1.5%. Detent torque is limited to 0.03 Nm so static cogging does not dominate micro-stepping. Electrical insulation is rated to 340 Vdc, and the Class B system maintains dielectric resistance of 100 megohms up to the 95 °C surface limit. The enclosure carries a rating of IP23, offering protection against fingers and light sprays.

Mechanically, the motor tolerates an axial shaft load of 60 N and a radial load of 90 N, figures suitable for belt drives or gearheads mounted on either end. Its aluminum housing weighs only 0.68 kg, helping keep moving assemblies light. Continuous duty is supported across ambient temperatures from -20 °C to +40 °C. Couplings, end supports, and any external seals must stay within these load and temperature limits during operation.