Product Description:

The M21NRXC-LNN-NS-00 is a hybrid stepper motor manufactured by Pacific Scientific for the POWERMAX II M Motors series. Built for incremental motion control in indexers, pick-and-place heads, and light gantry axes, it converts pulse trains into precise rotary steps needed by industrial automation equipment. The device follows the NEMA 23 frame standard, uses an enhanced construction format, and provides a direct means to position loads without external feedback components. This layout suits compact axes that need repeatable indexing and straightforward drive integration.

With the windings wired in parallel, the single-stack rotor produces a holding torque of 1.02 N·m, while detent torque is limited to 0.066 N·m for low static cogging. Each phase draws 3.5 A, and the winding has a phase resistance of 0.53 ohms with an inductance of 2.0 mH, so current rise is rapid for quick torque development. The step angle is 1.8 degrees, delivering 200 discrete positions per revolution, and inherent step accuracy remains within ±1.5%. Winding type C, a standard rotor, and the Class B insulation system support a thermal resistance of 5.5 °C/W. The insulation withstands 340 V DC and maintains 100 MΩ of resistance to ground, helping isolate the motor from driven electronics, while rotor inertia of 0.0017 oz-in-s² supports responsive but stable motion.

The motor uses a smooth single shaft that is 6.35 mm in diameter and tolerates axial loads up to 58 N and radial loads up to 89 N, protecting the bearings when pulleys or gears are attached. Overall length is 52.3 mm, and the motor weighs 0.68 kg, which helps with compact machine layouts. A NEMA mounting face, a regular lead-wire connection style, and one receptacle simplify installation. Operation is permitted from −20 °C to +40 °C, and the unit is supplied without a feedback encoder. Position verification is therefore handled by the controller or by the application design.