TT-2952-4051-A Kollmorgen
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The Kollmorgen TT-2952-4051-A is a direct drive motor from the Inland Direct Drive Motors series and uses a NEMA mount type. It has a peak torque of 11.3 Nm, peak current of 11.0 Arms, and operates at a maximum mains voltage of 480 VAC. The motor weighs 3.39 kg and has a rotor inertia of 1.5 kg-cm2.
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Product Description:
The TT-2952-4051-A is a frameless direct-drive servo motor segment produced by Kollmorgen and supplied under the Inland Direct Drive Motors series. As a permanent-magnet rotor and stator set, the unit is intended for integration into custom mechanical housings where precise, backlash-free rotation is required in semiconductor tools, indexing tables, and similar automated stations. By eliminating gearboxes, the motor transfers torque directly to the load, increasing positioning accuracy and reducing maintenance in industrial automation cells.
In dynamic operation, the motor can deliver a peak torque of 11.3 N·m while drawing up to 11.0 Arms of phase current from the drive, giving machinery enough short-term force for rapid acceleration. A torque constant of 1.26 N·m/A links controller output current to mechanical torque, allowing straightforward current-mode control. The back electromotive force constant is 80.9 V/krpm, so a matching amplifier must provide adequate DC bus voltage to counter the generated voltage during high-speed motion. Copper losses are governed in part by a winding resistance of 7.78 Ω, while the 26.8 mH phase inductance filters current ripple from pulse-width-modulated inverters. Ten magnetic poles provide fine electrical resolution for feedback devices. The NEMA mounting pattern simplifies alignment with standard machine frames, and the motor’s mass of 3.39 kg helps limit the overall weight of the machine.
During steady positioning tasks, the motor supplies a standstill torque of 3.42 N·m while requiring 2.74 Arms of continuous current. Static friction is limited to 0.026 N·m, allowing the servo to settle without excessive hunting. Thermal loading rises gradually because the laminated stack has a thermal time constant of 17 minutes before reaching its rated temperature. The rotor has an inertia of 1.5 kg-cm², which supports high acceleration without requiring excessive drive gain. The insulation system supports operation with compatible servo drives supplied by industrial three-phase mains at up to 480 VAC.
