Product Description:

The M21NRXC-LDN-NS-00 is a hybrid stepper motor produced by Pacific Scientific within the POWERMAX II M Motors series. It converts discrete command pulses from indexers or microstepping drives into precise angular movement. That operating method suits pick-and-place stations, small gantries, and metering pumps where open-loop position control is acceptable, and it can be used with basic drive electronics when closed-loop feedback is not required.

This model is built on a NEMA 23 frame and has a 2.06 in overall length, allowing compact installation in tightly spaced panels. A single stack of laminations and winding type C support a rated phase current of 3.50 A in parallel or 1.73 A in series, giving the motor flexibility with different drive current ranges. The motor delivers a static holding torque of 144 oz-in, which is suitable for moderate inertia loads, while the rotor’s 0.00168 oz-in-s² inertia helps reduce settling time. Motion resolution comes from a 1.8-degree full step, which yields 200 steps per revolution with ±1.5% accuracy. Electrical insulation uses Class B, 130 °C, backed by 100 MΩ resistance and a 340 Vdc dielectric rating. The motor uses enhanced construction, a regular lead-wire connection style, and a receptacle exit to simplify wiring, while the absence of feedback devices keeps the assembly simple. Thermal dissipation is characterized by a junction-to-ambient resistance of 5.50 °C/W.

The motor uses a double smooth shaft with a 0.2500 in diameter that fits standard couplings, and the pilot measures 1.500 in to match a 2.625 in bolt circle on NEMA mounts. It tolerates a maximum axial load of 13.0 lb and a radial load of 20.0 lb, covering typical belt or lead-screw thrusts in compact motion systems. Continuous operation is permitted between -20 °C to +40 °C. The double-ended shaft allows mechanical components to be attached on either side when the application requires it. The standard rotor design, smooth shaft surface, and single-stack layout help keep vibration low during normal operation.