Product Description:

The M21NSXC-LSS-SS-03 is a two-phase stepping motor produced by Pacific Scientific within the POWERMAX II M Motors series. It is intended for open- or closed-loop positioning tasks in pick-and-place arms, indexing tables, and other automation axes where discrete angular movement is required. The motor operates from a constant-voltage driver that meters phase current in sequence, generating synchronized electromagnetic fields that align the rotor teeth with the stator poles for incremental movement. This timing supports short settling times during repetitive positioning cycles. Its enhanced construction, standard rotor, and single magnetic stack provide predictable torque while keeping the package compact. The housing follows a NEMA mounting style and fits established 56 mm square mounting footprints.

The motor is built on a NEMA 23 frame, so its 56 mm square face matches common gearheads and brackets. Each electrical step advances the shaft by 1.8 degrees, and full-step excitation produces exactly 200 increments per revolution. Positional deviation is held within ± 1.5 % of a step, allowing precise repeatability without an encoder. The windings use the manufacturer’s C winding code, which indicates resistance and inductance suited to midrange current drives. This winding and rotor combination keeps detent torque low while sustaining dynamic torque across a wide speed range. The standard step angle also permits straightforward motion calculations when the controller converts travel commands into pulse counts.

The stator insulation is graded as Class B (130 °C), supporting operation within the permitted winding temperature limit. It tolerates up to 340 VDC between the windings and frame while maintaining an insulation resistance of 100 megohms. Continuous operation is permitted from -20 °C to +40 °C without derating. These electrical limits help protect the windings from leakage current and insulation breakdown during normal industrial use. A sealed receptacle provides a single electrical connection point, reducing the risk of contaminant ingress and simplifying cable access. The receptacle also keeps external wiring concentrated at one location instead of requiring separate terminations around the motor housing.