Product Description:

The QTT-1401A is a frameless direct-drive motor segment produced by Kollmorgen within the Inland Direct Drive Motors series. It is intended for integration into compact rotary stages and torque-mode actuators where the load couples directly to the rotor. This direct connection eliminates transmission backlash and increases positioning accuracy in industrial automation.

This model presents a winding resistance of 5.80 Ω at 25 °C, setting the steady-state current drawn at any applied voltage. The electrical time constant of 0.21 ms describes how quickly current stabilizes after a command step, supporting fast torque response. Peak system demands can be met with 6.11 A of current, which produces the rated peak torque of 0.388 N-m for short intervals. During locked-rotor testing, the coils require only 35.4 V to reach stall current, simplifying low-voltage drive design. The 1.2 mH phase inductance smooths switching ripple, while 217 W of stall power input represents the thermal load that must be managed by the machine frame. Static friction is limited to 0.0130 N-m, so minimal drive effort is lost in overcoming internal drag.

The rotor reaches a no-load speed of 557 rad/s when driven at the rated voltage, enabling high-velocity axes without gear reduction. Dynamic behavior benefits from a rotor inertia of 9.2 × 10⁻⁶ kg-m², which allows rapid acceleration while providing enough momentum for smooth velocity regulation. Winding insulation endures temperatures up to 155 °C, aligning with Class F materials for elevated ambient temperatures. A motor constant of 2.6 × 10⁻² N-m/W½ links continuous torque to power dissipation and assists with thermal sizing. The 49.3 mm outer diameter, 16.0 mm clear-through bore, and 13.7 mm axial length allow the stator to fit into constrained housings, while a torque sensitivity of 9.00 oz-in/A provides predictable proportional control during precision tasks.