P21NSXB-LNF-NS-02 Pacific Scientific
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The Pacific Scientific P21NSXB-LNF-NS-02 is a stepper motor from the POWERMAX II P Motors series with a NEMA 23 frame size and standard construction. This model offers a holding torque of 0.79 N·m, operates with a rated current of 4.6 A, and features a single flat shaft. It has a step angle of 1.8 degrees, 200 steps per revolution, and weighs 0.68 kg.
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Product Description:
The P21NSXB-LNF-NS-02 is a two-phase hybrid stepper motor built by Pacific Scientific for the POWERMAX II P Motors series. As a NEMA 23-frame device, it converts digital pulse trains from indexers or microstepping drives into incremental shaft movement, providing open-loop positioning for pick-and-place axes, small gantries, and valve actuators in automated machinery. The single-stack construction, receptacle connector, and lack of an encoder simplify drive wiring within NEMA-style installations.
The motor advances 200 full steps per revolution, so each step equals 1.8 degrees of shaft rotation. Cumulative positioning error remains within ±1.5% of a step, supporting repeatable indexing on conveyor lanes. A two-phase winding set delivers a static holding torque of 0.79 N·m when both phases are energized. The phase current rating is 4.6 A, and the type B windings have an inductance of 1.1 mH and a resistance of 0.64 Ω. These electrical characteristics support fast acceleration while limiting heat generated by electrical resistance. The electrical insulation is rated Class B for 130 °C and has an insulation resistance of 100 MΩ and a dielectric strength of 340 VDC.
The detent torque is limited to 0.03 N·m, reducing resonance when the drive is idle. The rotor stores limited kinetic energy because its inertia is 0.000012 kg·m², supporting rapid start-and-stop motion profiles. The housing has an overall length of 52.4 mm, allowing the motor to fit into compact motion assemblies. The motor weighs 0.68 kg, making it suitable for installation on lightweight carriages. Its standard construction includes a single shaft with a machined flat and a rotor with the standard lamination stack. The external case may reach a surface temperature of 95 °C during continuous operation, so heat sinks or adequate airflow should be provided when the motor is installed in a confined enclosure.
