Product Description:

The M21NSXA-LNF-NS-02 is a two-phase stepper motor manufactured by Pacific Scientific as part of the POWERMAX II M Motors series. Designed for incremental motion, it translates digital pulses into fixed shaft increments, providing open-loop position control for packaging tables, light gantries, and dispensing heads. By delivering detent torque when de-energized, the motor keeps loads stationary without external brakes, making it a compact actuator for low-inertia automation tasks.

Mechanical geometry conforms to the NEMA 23 frame, giving a square flange that measures 2.25 inches across flats with a 2.625-inch bolt circle for standard mountings. The overall stack depth is limited to a maximum of 2.06 in, allowing the motor to fit shallow enclosures. The single output shaft measures 0.2500 in in diameter, extends 0.75 inch, and has a 0.50-inch usable flat for keyed couplings. Each command pulse turns the rotor by 1.8 degrees, so one full revolution equals 200 discrete steps. This fixed relation simplifies index calculations and eliminates encoders in systems that tolerate open-loop accuracy. The enhanced construction and receptacle termination complete the motor’s basic configuration without feedback devices.

The rotor bearings can accept a continuous radial load of 20 lb and an axial thrust of up to 13 lb, supporting moderate belt tensions and thrust collars. The motor can operate in ambient temperatures from -20 °C to +40 °C, and the winding system meets Class B, 130 °C limits when used within normal duty cycles. Electrical isolation is supported by an insulation resistance of 100 Megohms at room temperature and a dielectric withstand of 340 Vdc between the windings and frame. Two stator phases, winding type A, and a single stack core provide the magnetic structure needed for the stated step accuracy, while the NEMA pilot and enhanced frame help maintain alignment during assembly.