Product Description:

The P21NRXD-LNF-NS-00 is a hybrid stepper motor built by Pacific Scientific as part of the POWERMAX II P Motors series. It turns incoming step pulses into incremental shaft movement, supplying open-loop position control for pick-and-place axes, indexing tables, and light conveyors used throughout automated equipment. A standard NEMA mounting face and single flat shaft let the motor couple to belts or lead screws without extra adapters, so motion stages can be assembled quickly with standard hardware. Its open-loop format suits machines that need consistent indexing and straightforward electrical integration.

Each revolution is divided into 200 discrete steps, giving a shaft increment of 1.8 degrees. When both windings are driven in parallel or series, the stator generates 109 oz-in of holding torque, while a unipolar drive produces 77 oz-in for lower copper loss. The frame conforms to the NEMA 23 envelope, providing a 56 mm square mounting pattern that matches many existing brackets. Windings are insulated to Class B 130 °C, allowing the coil temperature to rise well above ambient without degrading varnish or wire enamel. Positional repeatability is maintained within ±1.5 % of a step, a tolerance suited to feeders, dispensers, and similar devices where cumulative error must stay low. Two wound phases identified by code D exit through leadwires that mate with a receptacle, which simplifies installation and keeps external connections straightforward.

The thermal path from coil to housing is rated at 5.5 °C/W, and reliable service is specified from -20 °C to +40 °C, so operation in unconditioned enclosures is possible. Dielectric separation withstands up to 340 Vdc, while 100 MΩ of insulation resistance helps suppress leakage current. Acceleration response benefits from a rotor inertia of 0.0017 oz-in-s², and a single-stack construction helps keep reflected mass low. The motor weighs only 1.5 lb, which reduces load on linear slides or pick heads. Because the motor does not use feedback devices, control depends on commanded steps and a properly matched load.