Product Description:

The CTM21NLF04NAA00 is a hybrid stepper motor manufactured by Kollmorgen and supplied in the CT Stepper Motors series, specifically the Cool Torque Maximum Series that prioritizes maximum torque and efficiency. As a two-phase device with four lead connections, it carries out incremental positioning tasks in automated machinery without the need for feedback devices. A NEMA through-hole mounting interface and a Size 23 (57 mm) frame allow straightforward installation where compact motion control is required.

Each phase draws 0.45 A DC, a current level that keeps copper losses low while matching energy use to modest drive electronics. The phase winding resistance is 44 Ohms, which affects voltage demand and heating at stall. An inductance of 123 mH limits current rise and helps smooth torque at high step rates. Windings are insulated for up to 340 VDC, providing headroom for high-energy drive pulses. With a detent torque of 0.09 N·m and a fundamental step angle of 1.8°, the motor advances in 200 discrete positions per revolution, suiting indexing tables and light conveyor gates where open-loop repeatability is critical. Rotor inertia is 0.000025 kg·m², promoting quick acceleration when commanded by micro-stepped waveforms.

Rated bipolar holding torque reaches 1.84 N-m, providing strong static holding force. A round, smooth shaft of 6.35 mm diameter accepts standard couplings, and the single-stack lamination limits overall length while maintaining rigidity. The unit weighs 0.68 kg, easing gantry or end-effector integration where moving mass is a concern. Mechanically, the shaft can accept axial forces up to 50 lbs in either direction and radial forces of 20 lbs at the center, expanding applicability to belt drives or pulley arrangements. The motor ships without a rear add-on, leaving the back face clear for airflow or external encoders.