Product Description:

Pacific Scientific's P21NSXB-LNS-NS-02 is a two-phase stepper motor from the POWERMAX II P Motors series. Supplied in a NEMA 23 frame, this motor is intended to drive small linear tables, light conveyors, and instrument stages that require incremental positioning without external encoders. Its single-shaft rotor advances in controlled increments when paired with a microstepping drive, allowing precise open-loop motion in packaging, laboratory, and electronic assembly equipment. The unit follows standard construction, which keeps the physical envelope consistent across the series.

The electromagnetic geometry produces an incremental step angle of 1.8 degrees, giving 200 full-step positions per rotor revolution; combined with a step accuracy of ±1.5%, this supports repeatable index moves. With a holding torque of 0.79 Nm in parallel-wound mode, the motor can secure light mechanical loads when power is applied. In parallel operation, the coils draw 4.6 A and have a phase resistance of 0.32 Ω, while the 1.1 mH inductance affects current rise during microstepping. Two identical windings spaced 180° apart create the two-phase field, and the absence of an encoder simplifies cabling. Detent torque is 0.028 Nm, which helps limit static error when the phases are de-energized. The single output shaft follows the standard configuration for coupler or pulley attachment.

For thermal management, the windings use Class B, 130 °C insulation, backed by 100 Megohm resistance to ground and a dielectric withstand of 340 Vdc. Surface temperature may rise to 95 °C during continuous stall, provided ambient air remains within -20 °C to +40 °C. The single-stack rotor keeps inertia low, and the standard rotor profile is matched with B-type windings for balanced output. A NEMA face flange is provided, the power leads exit through a sealed receptacle, and the mounting holes align with common stepper brackets.