Product Description:

Pacific Scientific manufactured the M21NRXD-LSS-M1-02 stepper motor for the POWERMAX II M Motors series. This two-phase unit converts command pulses into incremental rotation for indexing, metering, and small gantry axes in industrial automation. It is supplied in an enhanced construction, uses a standard lead-wire connection style, follows the NEMA mounting pattern, and includes provision for encoder mounting when closed-loop feedback is needed. These features make it suitable for compact motion tasks where simple pulse control and optional feedback are both useful.

The motor frame conforms to NEMA 23, so it fits standard 2.3-inch square brackets used in compact machine assemblies. A holding torque of 0.95 Nm in parallel winding helps the motor maintain position under static load, while a phase inductance of 8.7 mH influences current rise and step response. Each phase can be driven at up to 1.51 A, and an insulation resistance of 100 Megohms helps protect the windings during normal operation. The phase resistance is 2.61 ohms, Class B insulation is used, and the dielectric strength is 340 Vdc. The single-stack format keeps the body short, while the listed detent torque, thermal resistance, and operating range of -20 °C to +40 °C support use in space-limited equipment.

A full step angle of 1.8 degrees produces 200 discrete steps per revolution, giving the motor predictable positioning behavior with a stated accuracy of ±1.5% without electronic compensation. The standard laminated rotor has an inertia of only 0.0017 oz-in-s², which helps the axis accelerate quickly while still supporting controlled settling after a move. Overall mass is held to 0.68 kg, which reduces the load on moving assemblies and supports use on smaller positioning stages. A receptacle supports auxiliary connections, the winding code is D, and the motor uses two electrical phases.