P21NRXB-LNS-NS-05 Pacific Scientific
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The Pacific Scientific P21NRXB-LNS-NS-05 is a stepper motor from the POWERMAX II P Motors series with a NEMA 23 frame size, single shaft configuration, and standard construction. The motor has a holding torque of 0.79 Nm, operates with two phases at a rated current of 4.6 A per winding, and offers an IP23 protection class. It has a step angle of 1.8 degrees with 200 steps per revolution and is designed for operating temperatures from -20°C to +40°C.
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Product Description:
Pacific Scientific’s P21NRXB-LNS-NS-05 belongs to the POWERMAX II P Motors series and is supplied as a two-phase hybrid stepper unit for incremental positioning in automated machinery. By combining a NEMA mounting interface with standard construction, the motor drops directly into instrument racks, conveyors, or small gantry axes. It is suited to low-mass drive systems that convert pulse trains from an indexer into repeatable mechanical motion with simple open-loop control.
The actuator can hold loads statically with 0.79 Nm of torque, so lead screws or belt stages remain fixed when drive power is idle. A full-step displacement of 1.8 degrees divides each mechanical revolution into 200 discrete positions, enabling open-loop indexing without an encoder. Electrical input is limited to 4.6 A per winding; when paired with the motor’s 0.64 Ω phase resistance, this sets the steady-state copper loss that must be removed by convection. The square flange conforms to the NEMA 23 frame code, giving a 56 mm mounting circle compatible with many compact gearheads. Rotational response is influenced by the rotor’s 0.012 ×10-3 kg·m² inertia, allowing quick acceleration while keeping resonance manageable in single-stack construction. This combination supports compact stages that need repeatable start-stop motion and predictable step response during basic indexing duty.
Environmental limits match typical cabinet conditions: the motor operates between -20 °C to +40 °C, and its open-frame build is rated to IP23, so only vertically falling drops or light dust can reach internal parts. The coil set presents a 1.1 mH inductance, which shapes current rise time and filters high-frequency drive switching while complementing the resistance and current values already noted. Because the housing is open-frame rather than fully sealed, the motor is best used where splashing liquids and heavy debris are limited. This operating range fits enclosed machines and light industrial stations with controlled ambient conditions.
Frequently Asked Questions about P21NRXB-LNS-NS-05:
Q: What is the holding torque provided by the P21NRXB-LNS-NS-05 motor?
A: The P21NRXB-LNS-NS-05 stepper motor delivers a holding torque of 0.79 Nm.
Q: What frame size does the P21NRXB-LNS-NS-05 use?
A: This model fits a NEMA 23 frame size for compatibility with standard mounting setups.
Q: What rated current does the P21NRXB-LNS-NS-05 require?
A: The P21NRXB-LNS-NS-05 stepper motor operates with a rated current of 4.6 A per winding.
Q: What type of shaft configuration comes with the P21NRXB-LNS-NS-05?
A: The shaft configuration for this motor is single, accommodating straightforward mechanical integration.
Q: How many steps per revolution does the P21NRXB-LNS-NS-05 provide?
A: This model offers 200 steps per revolution with a step angle of 1.8 degrees each.
