M21NRXB-LSS-NS-03 Pacific Scientific NEMA 23 137 Ounce Inch Stepper Motor
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
The Pacific Scientific M21NRXB-LSS-NS-03 is part of the POWERMAX II M Motors series and features a NEMA 23 frame size with an enhanced construction type. It delivers a maximum holding torque of 137 oz-in and operates at a step angle of 1.8 degrees, providing 200 steps per revolution. This motor uses Class B insulation rated for 130°C and has a parallel phase current of 4.6 A.
Internal Product Review
The M21NRXB-LSS-NS-03 is a Pacific Scientific POWERMAX II M stepper motor with enhanced construction and a NEMA 23 frame size. A 1.8° step angle and ±1.5% step accuracy support clean, repeatable positioning in precision indexing service. Holding torque up to 137 oz-in makes the motor a strong option for stable low-speed motion control.
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Product Description:
The M21NRXB-LSS-NS-03 hybrid stepper motor is produced by Pacific Scientific within the POWERMAX II M Motors series and serves indexed motion, positioning tables, and other open-loop automation axes. It uses a regular lead-wire connection style that terminates through a receptacle as its single connection point. An enhanced construction type combines a standard rotor with B-type windings, while the NEMA mounting style allows the housing to fit common brackets. One laminated stack forms the magnetic core, and the design is supplied without feedback devices. With 200 full steps per turn and a step accuracy of ±1.5%, the motor can increment machinery precisely when commanded by a drive.
The mechanical interface follows the NEMA 23 outline, so flange dimensions match 57 mm fixtures. At rest, the shaft resists loads up to 137 oz-in, which indicates the static holding torque available for cylinders, lead screws, or belts. Each phase can be energized with 4.6 A in the parallel configuration, producing rapid torque development while keeping copper loss within limits set by the 0.32 Ω phase resistance. Motion is executed in discrete increments of 1.8 degrees, and the magnetic field is produced by 2 phases that alternate during operation. Dielectric integrity is maintained up to 340 Vdc, allowing the Class B insulation system to withstand typical chopper-drive transients.
Continuous service is permitted between -20°C to +40°C, which suits typical control cabinet conditions. The windings are thermally rated to Class B, 130°C, and the varnish maintains 100 Megohms of resistance to ground to limit leakage current as the insulation ages. Drive pulses encounter 1.0 mH of inductance in the parallel circuit, and that value shapes current rise time while helping reduce voltage spikes. These electrical characteristics support stable step response and consistent operation in applications that rely on open-loop motor control.
