CTP21NLF39NAA11 Kollmorgen
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The Kollmorgen CTP21NLF39NAA11 is part of the CT Stepper Motors series and features a size 23 frame with NEMA through holes mounting style. It has a rated current per phase of 3.9 Amps and provides a bipolar motor torque of 1.41 Newton-meters. The stepper motor supports two phases and is equipped with a round smooth shaft.
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Product Description:
The CTP21NLF39NAA11 is a two-phase stepper motor manufactured by Kollmorgen within the CT Stepper Motors series. The motor is part of the Cool Torque Performance Series and has the high-torque characteristics needed to convert pulse trains from a stepper drive into accurate incremental shaft rotation. It is suitable for pick-and-place heads, metering pumps, small gantries, and other applications that require controlled positioning. Its round, smooth shaft provides a simple interface for clamping couplings, while NEMA through-hole mounting allows the unit to be secured in confined machine frames.
The motor draws a per-phase current of 3.9 A and has a phase inductance of 2.2 mH, allowing a fast current rise while keeping the required drive voltage moderate. The copper windings have a phase resistance of 0.60 Ω, so the drive must accommodate approximately 9 W of resistive heat at the rated load. Each full step advances the rotor by 1.8°, providing 200 discrete positions during one complete shaft revolution. The laminated stator inside the Size 23 / 5.7 cm frame produces 1.41 N·m of bipolar holding torque for the CTP version. Two phases and four lead wires support common bipolar control arrangements without requiring a complex connection scheme. A single magnetic stack keeps rotor inertia at 0.0035 oz-in-s², supporting responsive acceleration and deceleration. Thermal resistance is 3.57 °C/W, allowing generated heat to pass from the windings through the motor housing during operation.
The shaft supports an axial load of 50 lb (23 kg) in either direction and a radial load of 20 lb (9 kg) at its center, allowing gears or pulleys to be mounted directly when the load remains within these limits. Detent torque is 0.056 N·m, which reduces unwanted holding force when winding power is removed. The winding insulation withstands 340 VDC, providing ample electrical margin above the voltage used by typical low-voltage stepper drives. The smooth front shaft also accommodates suitable external couplings without requiring a keyed connection.
