Product Description:

The TBM-7631-A is a frameless torque motor segment produced by Kollmorgen within the TBM Frameless Motors series. Supplied as a stator and rotor kit without housing or bearings, it is intended for direct embedding in rotary stages, robotic joints, or gimbals where space is limited and inertia must be minimized. By supplying electromagnetic torque directly to a customer-supplied mechanical structure, the motor removes belt or gear reductions and enhances positional stiffness in industrial automation tasks.

The electromagnetic core produces a continuous torque of 1.65 N·m while drawing 8.9 Arms at stall. Dimensional integration is guided by a 36.07 mm through-bore that allows signal or fluid lines to pass through the shaft axis, a stator outside diameter of 74.68 mm, and an active axial stack of 45.97 mm. Heat generated by the 0.398 Ω phase-to-phase resistance and 0.6 mH inductance is managed through the host structure’s metallic path. At the nominal operating point, the motor reaches a shaft speed of 2300 rpm. Its 0.191 N·m/Arms torque constant and 11.56 Vrms/kRPM back-EMF constant set current demand and inverter voltage margin across the speed range. These figures support servo loops that require fine velocity and position control without step losses.

For transient moves, the unit can deliver 5.37 N·m while accepting peak currents up to 29.4 Arms, giving ample headroom for acceleration profiles or disturbance rejection. A continuous electrical input of 307 W allows sustained motion on a 48 VDC supply, which aligns with common low-voltage robotics platforms. Dynamic behavior benefits from the small 0.0000564 kg·m² rotor inertia, enabling rapid reversals and minimal settling time in point-to-point positioning. It is suited for lightweight automation assemblies that require quick reversals and accurate motion control.