Product Description:

The M21NRXA-LSN-M1-03 is a two-phase hybrid stepper motor produced by Pacific Scientific as part of the POWERMAX II M Motors series. With a 2.25 in across-flats NEMA face and a maximum body length of 2.06 in, it fits easily into compact control cabinets and gantry carriages. The unit converts pulse trains from an indexer or PLC into incremental shaft movement, delivering precise open-loop positioning for conveyors, labelers, and light pick-and-place axes in general-purpose automation.

This model uses a NEMA 23 frame that lines up with standardized 56.4 mm mounting patterns. The internal rotor advances in 1.8 degrees increments, so one electrical sequence yields 200 steps per revolution. A detent torque of 9.4 oz-in holds position when the coils are de-energized, useful for fixtures that must stay aligned during power loss. Dynamic behavior is shaped by a rotor inertia of 0.0017 oz-in-s², allowing rapid acceleration with limited overshoot. Because the motor contains a single lamination stack and Pacific Scientific’s A winding, inductance and resistance are balanced for mid-range speed work on 24–75 V dc drives. Step accuracy stays within ±1.5 %, so cumulative error over multiple turns remains predictable.

Thermal and dielectric limits set installation boundaries. The windings use Class B, 130 °C insulation, and heat exits the housing through a calculated 5.5 °C/W thermal path. Ambient service is permitted from -20 °C to +40 °C, enabling cold-room or standard factory operation without derating. With a mass of 1.5 lb, the motor adds little load to linear stages, and its smooth shaft plus regular leadwire receptacle simplify coupling to gears or pulleys. A body length of 2.06 in reduces envelope depth, while 100 MΩ insulation resistance and a 340 V dc dielectric rating support reliable performance on grounded or floating supply systems.