Product Description:

The CTM31NLS56KAA00 is a hybrid stepper motor manufactured by Kollmorgen within the CT Stepper Motors series. Positioned in the Cool Torque Maximum Series and identified as the Enhanced Series for maximum torque and efficiency, this NEMA 34 device is intended for precise bidirectional indexing in automated assembly, packaging, and material-handling equipment. By energizing its two-phase windings in sequence, the motor converts controller pulse trains into incremental motion, providing accurate open-loop positioning without the need for rotary encoders. This operating principle suits indexing tasks where repeatable step movement is more important than closed-loop servo feedback.

With a frame size of Size 34 / 8.5 cm, the motor fits standard NEMA envelopes and mounts through NEMA through holes. Its two-phase winding is brought out on six leads, enabling series or parallel drive wiring. That lead arrangement gives the drive more flexibility when matching available bus voltage and the required speed range. Each revolution divides into 200 full steps, set by a 1.8° step angle and held within ±3% accuracy. Electrical limits include 5.6 A/phase current, 0.53 Ω resistance, and 1.4 mH inductance; these affect current rise time and drive selection. The coils run at 3.0 VDC nominal and withstand 340 VDC insulation voltage. A single-stack core, a straight keyway shaft, and a rear face without accessories simplify installation. Detent torque of 30 oz-in holds position when unpowered, and a thermal resistance of 2.02 °C/W indicates the temperature rise per watt.

Mechanical capability is highlighted by a 4.9 N-m bipolar holding torque in CTM wiring, allowing the shaft to resist process loads without lost motion. The shaft can carry an 100 lbs (45 kg) axial load in either direction and a 65 lbs (29 kg) radial load at the centerline, supporting belt drives or couplings without auxiliary bearings. A 1.31 kg-cm² rotor inertia moderates acceleration so move profiles remain stable when high microstep rates are commanded. This balance of torque, inertia, and allowable bearing load supports use with pulleys, couplings, and moderate overhung loads.