Product Description:

The P21NRFA-LNN-NS-00 is a two-phase hybrid stepper motor built by Pacific Scientific within the POWERMAX II P Motors series. It converts pulse trains from a controller into fixed-angle rotor movement, a function used in pick-and-place heads, indexing tables, and light actuators. Standard construction, a single smooth shaft, and NEMA mounting let the unit fit pre-drilled frames, while eight flying leads support quick wiring. Open-loop operation is acceptable when the application can use the motor’s inherent step accuracy.

The motor provides a holding torque of 0.81 Nm in parallel wiring, enough to restrain modest loads when the stator is energized and the rotor is stationary. To reach this torque, the windings draw 5.6 A per phase, so the drive must supply adequate current. A phase resistance of 0.46 Ω contributes to copper loss, while a winding inductance of 0.8 mH limits current rise time. The precision-ground shaft is 6.35 mm in diameter, enabling direct coupling to compact gears or pulleys. Detent torque of 0.03 Nm helps resist drift when power is removed, and the rotor inertia of 0.012 × 10⁻³ kg·m² supports rapid acceleration during indexing cycles.

The motor body is only 52.4 mm long and weighs 0.68 kg, so multi-axis carriages can keep moving mass low without sacrificing stiffness. Class B insulation, a 340 Vdc dielectric rating, and 100 megohms of resistance protect the windings against electrical stress when ambient air remains between -20 °C to +40 °C. Motion resolution is fixed at 1.8 degrees per full step, giving 200 discrete positions per revolution with ±1.5% inherent accuracy, and finer increments are possible with microstepping drives. Axial and radial load limits of 60 N and 90 N accommodate typical belt or lead-screw side loads, and the NEMA 23 frame keeps alignment straightforward across standardized mounting patterns.