Product Description:

The TT2931-1011-AA is a frameless permanent-magnet motor element produced by Kollmorgen for the Inland Direct Drive Motors series. When integrated into a machine, the stator and rotor mount directly to the load so that torque is applied without intermediary gearing, improving accuracy and stiffness in industrial automation axes such as indexing tables or high-speed spindles. The motor is energized from a DC bus and relies on an external drive to regulate current, position feedback, and commutation.

The winding generates a continuous output of 1.7 lb-ft while drawing 9.88 A, and its torque constant of 0.232 N·m/A links commanded current to produced torque. A back-electromotive-force constant of 24.4 V/krpm indicates the voltage created during motion and assists the drive with field-oriented control. Motor copper losses are affected by a DC resistance of 0.685 Ω, whereas core and leakage effects are modeled by an 1.8 mH inductance. Rated mechanical power reaches 900 W, and operation is limited to a bus voltage of 115 VDC. The magnetic and mechanical design permits shaft speeds up to 4500 rpm, allowing the motor to support moderate- to high-velocity processes without oversaturating the magnets.

An inertia of 0.000942 kg·m² minimizes acceleration lag, and the assembly weighs 6.7 kg, which influences the load support structure and thermal path. Startup and transient events can be handled with a peak torque of 8.0 lb-ft, which the windings sustain briefly when supplied by a 90 A surge. Static friction is 0.145 N·m, and viscous damping is 0.037 N·m/krpm; the motion controller must compensate for both values to maintain precise velocity control. Feedback options include the TGF2030-162 tachogenerator, which produces an analog voltage proportional to speed for compatible legacy drive systems. The frameless configuration requires the surrounding machine structure to support the rotor, align the air gap, and provide an effective path for heat generated by the stator windings.