Product Description:

The P21NRXB-LNN-NS-00 is a two-phase hybrid stepper motor produced by Pacific Scientific for the POWERMAX II P Motors series. In automated machinery, it serves as a direct-drive positioning element for indexing and other small motion tasks. It translates command pulses into repeatable incremental rotation for index tables, pick-and-place arms, and small valve actuators while retaining the NEMA mounting interface commonly used in machine layouts. Its hybrid stepper design is well suited to systems that need repeatable pulse-based positioning without a servo-style feedback loop.

Motion resolution is fixed at a step angle of 1.8 degrees, so a full revolution is subdivided into 200 equal steps that the controller can address individually. Unpowered holding capacity comes from a detent torque of 4 oz-in, which helps restrict shaft drift when the phase windings are de-energized. The housing follows the NEMA 23 frame standard, providing a 2.3-inch square flange that mates with common brackets, and its bearings absorb a maximum radial load of 20 lb while permitting 13 lb axially. Single-stack construction reduces overall length without compromising stiffness, and the standard rotor inertia of 0.0017 oz-in-s² supports rapid acceleration with ±1.5% step accuracy. The motor has a smooth single shaft for simple coupler engagement, uses winding type B, and ships with regular lead wires terminated in a receptacle. It does not include feedback, so no encoder is fitted.

The internal insulation system is rated to Class B, 130 °C, giving margin above ambient for continuous duty in enclosed equipment. Dielectric spacing tolerates 340 Vdc and keeps leakage below 100 Megohms, which supports electrical isolation during operation. The unit operates within -20 °C to +40 °C and dissipates losses through a thermal path of 5.5 °C/W, so forced convection is generally unnecessary at typical torque loads. These operating limits suit installations where steady stepping duty and compact packaging are both important.