Product Description:

The CTM21NLS48NAA00 is a hybrid stepper motor manufactured by Kollmorgen and supplied in the CT Stepper Motors series. It belongs to the Cool Torque Maximum line, which emphasizes high torque and efficiency in a compact package for general automation duties. In industrial equipment, it is used where open-loop positioning is adequate for indexing tables, small gantries, packaging axes, and other motion points that need repeatable step control without encoder-based feedback or a large motor footprint.

The motor occupies a Size 23 frame that measures 57.2 mm across the mounting face and uses six leads for connection to bipolar or unipolar drives. This lead arrangement gives common wiring flexibility when the motor is paired with standard stepper electronics. When driven at the rated winding current of 4.8 A, the motor produces a holding torque of 1.84 N-m. A full revolution is subdivided into 200 integral steps, producing fine mechanical increments without the need for an encoder. Dynamic performance is assisted by a low rotor inertia of 0.000025 kg-m², allowing rapid acceleration with limited drive power. Electrical insulation is verified for 100 megohms resistance. Weight is limited to 0.68 kg, which helps reduce loading on linear stages and other compact moving assemblies.

The round smooth shaft exits only from the front and measures 6.35 mm in diameter and 20.57 mm in length. The front-only shaft layout leaves the rear of the motor closed, which can simplify mounting in compact machine spaces. Axial loading up to 50 lbs in either direction and radial loading of 20 lbs at the shaft center help protect the bearings during belt tensioning or gear engagement. Insulation integrity is maintained up to 340 VDC, and the windings resolve each command by a native step angle of 1.8°. The laminated stack length is one, matching the single-stack magnetic circuit, and installation uses NEMA through holes with leads that emerge from the stator housing to simplify routing.