Product Description:

Pacific Scientific manufactures the P22NRXA-LDF-NS-00 stepper motor as part of the POWERMAX II P Motors series. This two-phase unit has a standard construction, uses leadwire connections through a receptacle, and is delivered without feedback devices, which suits open-loop control. Deployed on compact indexing stages, labeling heads, and small conveyors, the motor turns command pulses into discrete shaft positions so that motion controllers can advance or hold loads with deterministic accuracy. It fits directly into machines that need incremental rotary movement.

The electromagnetic stack is arranged in two laminations and produces a holding torque of 1.39 Nm at rest, which is the maximum static load the shaft can resist while energized. Each electrical pulse rotates the rotor by 1.8 degrees, giving 200 full steps per revolution and maintaining ±1.5% accuracy for repeatable indexing. Current draw reaches 6.5 A in bipolar-parallel wiring, so drive sizing must account for copper losses and thermal rise against the Class B 130 °C insulation system. The coil inductance of 0.8 mH allows rapid current transition and supports higher mid-range torque when paired with a chopped PWM drive. A rotor inertia of 0.000025 kg·m² balances quick acceleration with load damping, which helps reduce overshoot in short-stroke moves.

Mechanical interfaces follow the NEMA 23 frame standard, giving the motor a 57.1 mm square body, a length of 78.7 mm, and a 6.35 mm double shaft with a 12.7 mm flat for couplers or pulleys. Axial loads up to 60 N and radial loads up to 90 N may be applied without exceeding bearing ratings, supporting belt tension or small gear forces. The motor operates in ambient temperatures from -20 °C to +40 °C, and its 1.13 kg mass aids cooling while keeping axes light. The winding resistance is 0.42 Ω, and the compact housing suits installation in tight equipment spaces.