Product Description:

The M21NSHS-LNN-NS-02 is a two-phase stepper motor produced by Pacific Scientific for the POWERMAX II M Motors series. As an incremental actuator, it advances a fixed angle each time the controller issues a pulse, providing repeatable positioning for small conveyors, test fixtures, and light pick-and-place tooling in industrial automation lines. This operating method allows straightforward open-loop motion control when the applied load stays within the motor's available torque range. In stepper applications, this predictable indexing is useful where the controller counts pulses instead of relying on a separate feedback device.

The motor is built with an Enhanced construction, meaning additional laminations and optimized magnetic paths boost torque within the same package envelope. Its frame conforms to the NEMA 23 mounting pattern, so it mates directly with standard 2.3-inch square brackets and gearheads. The NEMA 23 face size also makes the motor easy to fit into existing brackets, couplings, and compact axis modules. Winding insulation meets Class B, 130°C thermal limits, allowing continuous operation at the stated temperature rise. A dielectric withstand of 340 Vdc helps protect the coil from overvoltage spikes that can appear on unfiltered supplies. Insulation resistance is 100 MΩ, and the motor is suitable for ambient temperatures from -20°C to +40°C, which supports use in unheated factory spaces or cabinets with limited cooling.

The motor has a fundamental step of 1.8 degrees, yielding 200 discrete steps per revolution for direct coupling to lead screws or timing belts. Because the stator uses 2 phases that are energized in sequence, the drive can use full-step, half-step, or microstep excitation to refine resolution beyond the base increment. Four stator leads are brought out in a 4 lead parallel configuration, allowing either parallel or series connection so current draw and inductance can be matched to the supply and drive characteristics. When operated with microstepping, motion can become smoother and quieter, which is useful in light-duty positioning axes that must limit vibration. This wiring flexibility also helps the motor adapt to different controller current limits and speed ranges without changing the basic mechanical package.