Product Description:

The CTP21NLF39NAA00 is a Size 23 stepper motor manufactured by Kollmorgen within the CT Stepper Motors series. Classified under the Cool Torque Performance and High Torque Performance groups, it uses a single-stack lamination to supply open-loop motion for positioning stages, labelers, or small conveyors. A round smooth shaft makes direct coupling straightforward, and the NEMA through-hole mounting pattern aligns with standard plates. Four color-coded leads exit the housing, so wiring to bipolar drives is uncomplicated.

With bipolar excitation, the CTP variant delivers 1.41 N-m of pull-out torque, while the motor’s static holding capability reaches 200 oz-in when both phases remain energized. Each phase can be driven with 3.9 A, and the winding resistance of 0.60 Ohms together with a 2.2 mH inductance affects current rise and microstepping smoothness. One full revolution is divided into 1.8° increments, yielding 200 discrete full steps for precise indexing without an encoder. Thermal performance includes a 3.57 °C/W thermal resistance, a compact 2.115-inch body length, and a rotor inertia of 0.0035 oz-in-s², which supports high acceleration while helping maintain safe coil temperatures.

The motor tolerates an axial load of 50 lbs in either direction and a radial load of 20 lbs at the shaft center, making it suitable for belt tension or light pulley side forces. Its 5.7 cm frame width, single-stack construction, and 1.4 lb mass help reduce moving inertia on linear axes, and the motor has no rear attachment. A dielectric withstand of 340 VDC plus 100 megohms of insulation resistance helps guard against electrical breakdown when long cable runs are used. The leads provide the required four connections, and the through-hole mounting pattern helps keep alignment consistent with standard NEMA flanges.