Product Description:

The CTM31NLF72KAA00 is a stepper motor manufactured by Kollmorgen as part of the CT Stepper Motors series. Built on the Cool Torque Maximum concept, it serves position or speed duties in packaging lines, pick-and-place stations, and light gantry axes that favor open-loop control. Its hybrid rotor design provides high holding torque for repetitive indexing, and the NEMA through-hole flange lets it mount directly to standard motion hardware on compact automation axes. That arrangement suits machines that need repeatable starts and stops without encoder feedback.

At its rated phase drive of 7.2 A/Phase, the motor develops a holding and running torque of 4.9 N-m in the CTM configuration, giving reliable force for medium-inertia mechanisms. Each electrical step advances the shaft by 1.8°, yielding 200 full steps per revolution, while a step accuracy of ±3% keeps positional error within typical sensorless application limits. The square-flange footprint is classified as Size 34 and spans 85 mm across, permitting interchange with other NEMA 34 drives. Dynamic response is influenced by the rotor’s mass moment, and the value of 1.31 kg-cm² helps balance quick acceleration with stable motion. Supporting electronics operate with a low phase resistance of 0.34 Ω and an inductance of 1.7 mH, allowing current to rise rapidly when microstepping controllers command higher pulse rates.

Electrical insulation is reinforced to withstand up to 340 VDC, and the windings exhibit 100 MΩ of resistance to ground, reducing leakage in high-humidity production cells. The straight keyway shaft can accept an axial load of 100 lbs in either direction and a radial load of 65 lbs at the midpoint, so couplings and pulleys can be clamped without separate bearings. Heat generated during extended cycles leaves the stator through a thermal path rated at 2.02 °C/W; with a net weight of 1.9 kg, the motor sheds energy efficiently when mounted to a metallic frame. A rigid mounting surface helps carry heat away from the housing during long production runs. Driven from supplies as low as 2.4 VDC, the low back-EMF design matches high-current microstepping drives that operate from compact bus voltages.