Product Description:

The CTM21NLF56NAA00 is a hybrid stepper motor manufactured by Kollmorgen as part of the CT Stepper Motors series and grouped within the Cool Torque Maximum Series. It serves as a motion element in industrial automation where open-loop positioning is acceptable. Pulse commands from a drive advance the shaft in fixed increments, allowing indexing tables, light conveyors, and laboratory devices to reach repeatable angular positions without feedback hardware.

This motor develops up to 1.84 N-m of holding torque in its CTM configuration while the companion CTP version reaches 1.41 N-m. The frame is Size 23 (5.7 cm) with a 2.13-inch body that carries a single-stack lamination, and the unit weighs 1.5 lb. Four color-coded leads provide phase power, matching the leads connection style, and the windings draw 5.6 A DC per phase. A full revolution is divided into 200 discrete full steps, and the ±3% step accuracy is aided by a rotor inertia of 0.0035 oz-in-s². The motor has a phase inductance of 0.78 mH and a phase resistance of 0.31 Ω. The insulation system withstands 100 MΩ at 340 VDC, and heat is transferred through a thermally conductive housing that mounts with NEMA through holes to a machine frame. A smooth, round shaft transmits torque to the load.

The design maintains a mechanical step angle of 1.8°, and a thermal resistance of 3.57 °C/W governs allowable temperature rise during continuous operation. Axial loading is permitted to 50 lb (23 kg) in either direction, while radial loading at the shaft center is limited to 20 lb (9 kg). These limits help protect the bearings during pulley or gear installation. No rear configuration is supplied, which helps reduce enclosure depth requirements. The Enhanced Series characteristic emphasizes maximum torque with high efficiency, and the smooth, round shaft along with NEMA through-hole mounting helps simplify integration into compact automation assemblies.