Product Description:

The M21NRXE-LNF-NS-00 is a two-phase stepper motor manufactured by Pacific Scientific within the POWERMAX II M Motors series. As a hybrid unit with a single flat shaft, it converts pulse commands from motion controllers into precise incremental rotation for small conveyor sections, metering valves, and light gantry axes in industrial automation. Enhanced construction and a standard rotor create a compact motor for standardized machine mounting, and it operates without feedback devices while still delivering repeatable open-loop motion. This type of motor suits applications that rely on commanded step counts rather than continuous position feedback.

The motor advances by 1.8 degrees per full step, so a complete turn is divided into 200 discrete positions. That pattern, combined with a step accuracy of ±1.5%, supports consistent indexing without closed-loop correction. Its stator is wound for 2 phases, giving the simple drive topology preferred in PLC-linked stepper amplifiers. This arrangement is common in systems that use pulse-and-direction control and need stable incremental movement at low speeds. A frame size of NEMA 23 corresponds to a 57.10 mm body width and aligns the 6.35 mm single shaft with standard couplings. Within the 52.3 mm housing length, the single-stack rotor maximizes torque density. Flat machining along a 12.7 mm portion of the shaft eases set-screw attachment. Electrical terminations are provided as regular leadwires with a receptacle, and the enhanced construction omits encoders. Class B insulation is rated for 340 VDC and supports 100 MΩ insulation resistance at 130 °C.

For mechanical integration, the unit supports an axial shaft load of 58 N and a radial load of 89 N, allowing belt pulls or thrust collars to be applied without premature bearing wear. Those load ratings suit light transmission components where side load and thrust remain moderate during indexing duty. The overall mass is only 0.68 kg, which helps small axes accelerate without adding much inertia. The motor operates in ambient temperatures from -20 °C to +40 °C, supporting use in chilled warehouses or warm process areas. Its NEMA mounting face provides a standardized bolt pattern for attachment to machine brackets or compact gear reducers.