Product Description:

The CTP21NLS31NAA00 stepper motor is manufactured by Kollmorgen as part of the CT Stepper Motors series in the Cool Torque Performance line. Designed for industrial automation, the unit converts commanded pulse sequences into controlled incremental rotation for accurate positioning in conveyors, labeling heads, light machining tables, and similar equipment. It uses a high-torque stator to support responsive indexing and repeatable step movement in compact motion systems. A smooth round output shaft allows direct coupling to the driven load, while the NEMA through-hole face simplifies mounting to frames or gearheads.

Mechanical dimensions begin with the Size 23 frame, which corresponds to a 57.15 mm square body and fits standard NEMA 23 mounting hardware. Overall depth is only 53.72 mm, so the motor can fit into tight spaces inside machinery or electrical enclosures. The windings draw 3.1 A per phase through six flying leads, and the phase inductance of 1.9 mH supports a balance between current response and drive voltage demand. Under bipolar excitation, the motor produces 1.41 N-m of holding torque for mid-inertia loads that require quick starts and stops. Insulation is rated at 340 VDC with 100 MΩ resistance, and the single-stack rotor drives the load through a 6.35 mm diameter shaft.

Motion resolution is based on a full-step increment of 1.8°, with an accuracy of ±3%, so finer microstepping can be added for smoother travel. The shaft can support an axial load of 50 lbs in either direction and a 20 lb radial load at the center without damage, aided by preloaded bearings. Thermal behavior is characterized by 3.57 °C/W, which helps estimate temperature rise in relation to heat dissipation and available airflow. With a mass of only 0.64 kg, rotor inertia of 0.000025 kg·m², and a smooth round shaft, the motor is suited to rapid acceleration. Rear access remains open, there is no integral feedback device, and the six lead wires allow series or parallel connection options.