Product Description:

The TBM-12941-B is a frameless torque motor kit produced by Kollmorgen within the TBM Frameless Motors series. When built into a customer-supplied housing and bearing stack, it supplies direct-drive rotary motion without the mass or compliance of a gearbox, which is useful for gimbals, collaborative robot joints, and other space-constrained axes that demand high torque density. This format lets the machine structure provide the surrounding support components, which can improve stiffness and reduce backlash in precision rotary applications.

At its thermal limit, the stator delivers a continuous stall torque of 7.66 N-m while drawing 14.9 Arms, and this pairing indicates the steady-state load the motor can hold without overheating. The rated operating point is 580 RPM and 830 W, providing a balance between speed and mechanical output for mid-speed positioning tasks. A back electromotive force constant of 32.3 Vrms/kRPM determines voltage feedback to the drive, and the torque constant of 0.535 N-m/Arms shows how much torque is produced per ampere. Twelve electromagnetic poles lower cogging and improve low-speed smoothness. Static friction is 0.346 N-m, so only a modest breakaway current is required. The 0.68 mH phase inductance shapes current-loop bandwidth, while 0.215 ohm of DC resistance sets copper loss at stall.

During acceleration, the control system must accommodate a peak stall torque of 24.4 N-m and up to 46.5 Arms, so the drive must handle short surge demands without current foldback. The windings are intended for a 48 VDC bus, allowing operation from common low-voltage supplies. A rotor inertia of 0.000721 kg-m² supports rapid reversal with limited energy storage, and the assembly weight of 3.17 kg helps keep moving mass low in lightweight mechanical structures. The moderate inductance, low resistance, and 12-pole configuration also support fast electrical response, which helps high-bandwidth servo loops use the available continuous and peak torque range effectively.