Product Description:

The M22NSHS-LNN-NS-02 is a two-phase stepper motor manufactured by Pacific Scientific as part of the POWERMAX II M Motors series. It fits motion stages that require incremental position control, advancing the shaft in finite steps when commanded by a matching drive or indexer. The motor is intended to deliver repeatable torque without a feedback device, which simplifies wiring while still supporting positioning tasks in small conveyors, valve actuators, and laboratory instruments.

The housing spans 2.25 in across the flats and conforms to the NEMA 23 frame envelope, so it mounts directly onto standard 23-frame brackets. A hybrid rotor advances in 1.8 degrees per energized step, giving a native resolution of 200 discrete positions per revolution. With two stator stacks and four leads, the motor supports high-current, low-inductance operation. The construction is enhanced, using optimized magnetic steel and a standard rotor to maximize pull-out torque. A single smooth shaft exits the front face for coupler or pulley attachment, and the NEMA mounting style sets the pilot diameter and bolt circle. Electrical insulation is rated at 340 Vdc and classified as Class B 130 °C, supporting typical drive voltages while keeping winding temperature rise within safe limits. Step accuracy stays within ±1.5%, which helps maintain positional repeatability without an encoder.

The motor operates in ambient conditions from -20 °C to +40 °C and has an insulation resistance of 100 Megohms when tested at room temperature. Thrust along the shaft may reach 13 lb, while overhung belt or gear loads can apply up to 20 lb radially without reducing bearing life. A smooth, single-ended shaft eliminates key stress risers, and the two-stack magnetic circuit helps distribute flux evenly to reduce cogging. Four leads simplify connection to bipolar chopper drives, and the enhanced construction helps maintain thermal margins during rapid indexing cycles.