Product Description:

The TBMS-7646-B is a frameless brushless torque motor produced by Kollmorgen within the TBM Frameless Motors series. It is supplied as separate rotor and stator components and is intended to be built directly into an application's mechanical structure so that motion control functions are delivered without additional housings. This arrangement allows the motor to become part of the surrounding assembly instead of sitting inside a separate motor body. By eliminating shaft couplings and bearings, this format reduces envelope size while still providing direct-drive performance for collaborative robots, gimbals, and compact actuators.

The motor is designed for a 24 VDC bus; at that voltage, it delivers a rated mechanical output of 217 W while turning at 1025 RPM. Continuous stall torque reaches 2.13 N-m when a winding temperature of 60 °C is maintained, and this operating point requires a continuous stall current of 11.8 Arms. Its torque constant and back electromotive force constant support predictable current-to-torque behavior and regenerative voltage response during controlled motion. The twelve-pole design helps reduce cogging and supports smooth rotation, while static friction of 0.068 N-m keeps detent torque low so small current changes can initiate movement. This is useful in direct-drive axes where stable low-speed motion and accurate torque response are important.

For short-duration demand, the motor can produce a peak stall torque of 5.51 N-m with a drive current of 29.4 Arms. The copper windings have a phase resistance of 0.245 ohms and a phase inductance of 0.4 mH, which affect current-loop response and resistive heating during acceleration. These electrical values matter in servo control because they influence how quickly current can rise and how much heat is generated during rapid torque changes. A rotor inertia of 0.0000819 kg-m² lets the motor reach commanded speed quickly, which supports tight position control without adding unnecessary mass.