M21NRXA-LNN-NS-00

The Pacific Scientific M21NRXA-LNN-NS-00 is a high-performance hybrid step motor in the POWERMAX II M Motors series, engineered to deliver precision motion control in demanding applications. Manufactured by Pacific Scientific, this NEMA 23 frame stepper integrates advanced POWERMAX II technology and proprietary Sigmax design to optimize flux paths and improve torque density. The motor’s core features include Samarium cobalt magnets for enhanced magnetic flux concentration and 30 mm bearing diameters to extend service life under varied load conditions. With a robust mounting configuration, the M21NRXA-LNN-NS-00 adapts readily to custom axes, offering consistent torque and acceleration across a wide operational envelope. The combined effect of these technologies results in a motor solution that balances performance and cost-effectiveness for automated machinery and robotics.

The M21NRXA-LNN-NS-00’s electrical characteristics are precisely defined for reliable integration. It provides Holding Torque: 1.00 Nm and Detent Torque: 0.66 Nm to ensure stable positioning even at standstill. Each phase exhibits a Phase Resistance: 0.92 Ω ±10% and typical Phase Inductance: 0.70 mH, enabling predictable current response. Rated for 5.6 A DC per phase, the motor can operate with low ripple and minimal torque ripple when driven by compatible amplifiers. The thermal design yields a Thermal Resistance: 5.5 °C/W (mounted), ensuring manageable temperature rise under continuous operation. These critical specifications facilitate accurate modeling and control in precision motion systems.

Operational performance is further enhanced by mechanical and magnetic refinements. The use of Samarium cobalt magnets improves torque output per ampere, while Sigmax technology enhances current utilization compared to conventional hybrid steppers. The enlarged 30 mm bearings quadruple fatigue life relative to 22 mm designs, supporting over 10,000 hours of operation at step rates up to 10,000 full steps per second under rated axial and radial loads. The NEMA 23 mounting pattern affords a compact footprint without sacrificing rigidity, enabling high acceleration profiles with minimal vibration. Together, these features ensure the M21NRXA-LNN-NS-00 maintains precision and durability in dynamic industrial environments.

System integration is simplified by standard interface provisions and proven component compatibility. The motor accommodates the industry-standard HEDS 5600 series encoder from Agilent Technologies for closed-loop position feedback. Its NEMA 23 frame and common mounting bolt circle allow direct drop-in replacement for existing stepper installations. The M21NRXA-LNN-NS-00 is ideal for applications in CNC machinery, pick-and-place robotics, semiconductor handling, and other automated systems demanding high torque accuracy and long-term reliability.