CTM21NLF56SSS11 Kollmorgen
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The Kollmorgen CTM21NLF56SSS11 is part of the CT Stepper Motors series and features a size 23 frame with a NEMA through holes mounting style. This stepper motor delivers a bipolar torque of 1.84 Newton-meters and 200 full steps per revolution with a step angle of 1.8 degrees. It is designed for maximum torque and efficiency, supporting an axial shaft load of 50 pounds in both directions and operating at a rated current of 5.6 Amperes DC.
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Product Description:
The CTM21NLF56SSS11 is a hybrid stepper motor manufactured by Kollmorgen for the CT Stepper Motors series and is part of the Cool Torque Maximum Series. It transforms command pulses from a drive into discrete shaft positions for open-loop motion tasks in industrial automation. The Enhanced Series—Maximum Torque and Efficiency designation identifies this model as a high-output option that delivers elevated torque while retaining a moderate overall size. This combination supports compact equipment that requires precise and capable actuation without a feedback device.
The motor draws a rated current of 5.6 A DC per phase and has a phase resistance of 0.31 Ω, which helps limit copper loss. Its phase inductance of 0.78 mH supports fast current rise times, while a thermal resistance of 3.57 °C/W affects case temperature during continuous operation. Under these conditions, the CTM winding produces 1.84 N-m of bipolar torque, whereas the alternate CTP lead configuration reaches 1.41 N-m for lower-current drives. The two phases generate 200 full steps per revolution, and the rotor inertia is 0.000025 kg·m² to promote rapid settling. The insulation withstands 340 VDC and has a resistance of 100 MΩ. Four lead wires provide the electrical interface, and the motor uses one laminated stator stack to control its axial length.
The motor has a Size 23 frame measuring 5.7 cm square and uses NEMA through-hole mounting for direct installation. The shaft has a special profile, and the rear housing has a special configuration for auxiliary hardware. With a step angle of 1.8° and a positioning accuracy of ±3%, the rotor indexes predictably without feedback. The assembly withstands an axial load of 50 lb (23 kg) in either direction. It also supports a radial load of 20 lb (9 kg) at the shaft center, allowing the motor to operate with gears, pulleys, or screw drives in automated equipment.
