Product Description:

The M22NRFB-LDN-NS-00 is a hybrid stepper motor manufactured by Pacific Scientific for the POWERMAX II M Motors series. In machine tools, pick-and-place stations, and indexing tables, the unit converts pulse commands from a drive into precise rotary motion that can be held in position without external gearing, making it a compact positioning element in industrial automation. Its hybrid stepper design supports repeatable incremental motion, so it suits applications that need accurate positioning, stable low-speed operation, and simple open-loop control without encoder feedback.

Mechanically, the motor fits a NEMA 23 frame and uses enhanced construction with standard NEMA face mounting. It is 78.7 mm long, 57.15 mm wide, and weighs 1.13 kg. A smooth double shaft with a diameter of 6.35 mm projects 20.57 mm from each side, and detent torque is 0.12 N·m. Two stacks and two phases terminate as eight flying leads in a regular lead-wire style; in parallel, each phase needs 4.6 A DC. Circuit losses are limited by 0.38 Ω resistance and 1.7 mH inductance. Static holding torque reaches 1.79 N·m, while rotor inertia of 0.0000252 kg·m² permits rapid acceleration. Insulation is Class B (130 °C) with 100 Megohms resistance and a 340 Vdc dielectric strength.

During operation, the rotor advances in 1.8 degrees increments, giving 200 full steps per revolution with a positional tolerance of ±1.5 %. The standard rotor and Winding B pattern work with the no-feedback configuration, so position is inferred from commanded pulses. Loads may be applied axially up to 58 N or radially up to 89 N without exceeding bearing limits. The smooth double-ended shaft eases the addition of a handwheel or sensor, and the NEMA face aligns with gearheads when higher torque is required. All materials are rated for continuous service from -20 °C to +40 °C, matching the thermal environment of typical control cabinets.