Product Description:

The TBM-6025-B is a frameless torque motor stator-rotor set produced by Kollmorgen within the TBM Frameless Motors series. When integrated directly into a machine structure, the rotor couples to the load without bearings, providing compact rotary actuation for robotics, gimbals, and other motion axes where space and weight are limited. In industrial automation, it supplies direct-drive torque without gear reduction, improving positional accuracy and dynamic response.

At stall, the electromagnetic package can deliver 0.694 N-m continuously while drawing 7.62 Arms from the drive. The copper paths present a DC resistance of 0.318 Ω at 25 °C, so heat generation remains low at rated current. A phase inductance of 0.2 mH smooths current change and helps protect the inverter against transients. Speed regulation centers on the mechanical limit of 2250 RPM; at this point the winding generates a back electromotive force of 5.75 Vrms/kRPM, which the controller must overcome to sustain rotation. Torque production scales linearly with phase current at 0.095 N-m/Arms, allowing straightforward current-mode control. The stator ring measures 59.06 mm in outside diameter and 60.96 mm in axial length, permitting installation inside small housings without increasing axis height.

For transient events such as rapid indexing, the motor tolerates a peak load of 2.56 N-m while the drive may supply up to 27.7 Arms for short periods. The motor operates from a 24 VDC bus, which simplifies use with battery-based or low-voltage supplies. With a continuous mechanical output of 125 W, the unit fits applications that need moderate power but strict mass limits. The active assembly weighs 0.398 kg and contributes a rotor inertia of 0.0000252 kg-m², helping the axis accelerate quickly. The lightweight construction minimizes reflected mass in collaborative robots while maintaining thermal margin through the direct mounting interface that spreads heat into the machine frame.