Product Description:

The M21NRXB-LNN-NS-00 is a two-phase stepping motor produced by Pacific Scientific within the POWERMAX II M Motors series. Designed for indexing tables, pick-and-place actuators, and other positioning duties, the unit converts digital pulse commands into discrete shaft movement for industrial automation systems. This operating method supports repeatable open-loop positioning in equipment that depends on accurate incremental motion.

This motor uses enhanced construction and a regular leadwire connection style. The integral receptacle provides the electrical interface, and the single-stack lamination keeps the package compact. The package fits the NEMA 23 frame envelope and uses a NEMA mounting flange for direct installation in compatible machinery. Under parallel wiring, the motor develops 137 oz-in of holding torque while drawing 4.6 A per phase. Series wiring provides the same holding torque, while unipolar connection reduces output to 97 oz-in when lower bus current is available. Thermal endurance is supported by the Class B 130 °C insulation system, along with 100 megohms of resistance to ground and a 340 Vdc dielectric withstand. Each full step is 1.8 degrees, and the ±1.5% step accuracy supports precise positioning without closed-loop feedback. Winding type B and phase inductance values of 1.0/4.0/1.0 mH give electrical characteristics that work with general-purpose motion controllers.

A detent torque of 9.4 oz-in provides passive shaft holding when the drive is disabled, while the bearings tolerate axial forces up to 13 lb and radial forces up to 20 lb. The single, smooth 0.2500 in shaft simplifies coupling, and a thermal resistance of 5.5 °C/W helps keep winding temperature within limits across an ambient range of -20 °C to +40 °C. With 200 discrete steps per revolution, the motor supports fine incremental motion and operates without feedback.