Product Description:

The P21NRXB-LDN-NS-00 is a hybrid stepper motor manufactured by Pacific Scientific for the POWERMAX II P Motors series. The NEMA 23 frame and double-ended shaft allow the motor to be coupled to a load on one side and to an encoder or handwheel on the other. In automated pick-and-place modules or light conveyor zones, it converts digital step commands into incremental motion without closed-loop feedback.

At full energization, each winding draws a rated current of 4.6 A, enabling the stator to hold the rotor with up to 0.79 N·m of static torque. The 1.8-degree step angle sets the basic resolution, and with micro-stepping drives that increment can be subdivided for smoother travel while the native 200 steps per revolution remain unchanged. Low rotor inertia of 0.000012 kg·m² lets the axis accelerate and decelerate quickly, reducing cycle times in intermittent-duty positioning. Electrical time constants are influenced by the phase inductance of 1.1 mH, so current rises rapidly and torque settles in a few milliseconds. Two phases share the laminated core, creating the 90-degree flux offset that yields bidirectional motion and precise detent alignment even when power is removed.

Mechanical proportions aid integration in compact machinery; overall body length is 52.4 mm, and the standard NEMA flange accepts front-face mounting screws. A smooth double shaft of 6.35 mm diameter extends 20.60 mm at the front and 19.10 mm at the rear, supporting direct coupling to brakes, encoders, or lead screws. With a mass of 0.68 kg, the rotor contributes little inertia to mobile stages. Thermal durability is supported by a Class B, 130 °C insulation system that passes a 500 VDC dielectric test and maintains at least 100 MΩ resistance at room temperature. Continuous duty is approved between -20 °C to +40 °C, and lead-wire connections terminated in a receptacle support straightforward cable attachment.