Product Description:

The M22NRFA-LDS-NS-02 is a two-phase stepper motor manufactured by Pacific Scientific in the POWERMAX II M Motors series. In industrial automation, it delivers indexed rotary motion for pick-and-place arms, light conveyors, and metering pumps where repeatable positioning is required without closed-loop feedback. The device follows the NEMA mounting standard, allowing direct installation in 57 mm frames and simplifying bracket or panel layouts where compact motion hardware must fit beside sensors, guides, and couplings.

With a NEMA 23 frame, the motor measures 78.8 mm in body length and presents a 57.10 mm width across flats, while a 38.10 mm pilot aligns the front face to the driven load. Each electrical cycle advances the rotor by 1.8 degrees, yielding 200 discrete steps per revolution; together with its 2 stator phases, this geometry balances torque and smoothness during incremental motion. The manufacturer cites a positioning tolerance of ±1.5%, so travel error remains within a narrow range from one commanded step to the next. Enhanced construction uses A-series windings, a standard rotor, and two magnet stacks to increase torque density, and eight flying leads connect the coils through a regular leadwire arrangement. A double-ended shaft supports encoders or couplings even though this configured version has no feedback device.

The electrical insulation system meets Class B, 130 °C limits and provides an insulation resistance of 100 Megohms when tested at ambient temperature, while the windings withstand up to 340 Vdc without breakdown. These values support operation across an ambient range of -20 °C to +40 °C. Radial bearings tolerate 20 lb, and the axial stack endures 13 lb, which helps the motor handle moderate belt tension and thrust loads in compact machinery. A 5.08 mm mounting-hole diameter accepts common cap screws, and the NEMA face keeps alignment straightforward. The double-ended shaft also supports external dampers, and the regular lead exit helps route wiring in cabinets that do not use right-angle connectors.