Product Description:

The TBMS-12995-B is a frameless permanent-magnet motor kit produced by Kollmorgen within the TBM Frameless Motors series. Its open architecture supplies only the rotor and stator so the end user can integrate them directly into a gear, ring, or actuator, allowing the machine housing to serve as the motor frame. By eliminating a separate casing, the kit reduces radial stack-up, saves weight, and places torque generation at the exact axis of motion. This approach is common in articulated robots, gimbal systems, and other automation equipment that require precise, compact, direct-drive rotation.

Electrically, the motor is intended for a 48 VDC supply rail. At that voltage, it can sustain a phase current of 18.10 A, producing a continuous stall torque of 9.88 Nm without exceeding its thermal limit. The laminated core and coil geometry give an outside diameter of 128.88 mm, while the rotor-magnet assembly has a rotational inertia of 9.37E-04 kg·m². Together, current, torque, size, and inertia set the dynamic bandwidth that a servo controller can achieve, because lower inertia supports faster acceleration and a modest bus voltage keeps semiconductor losses and insulation stress within typical low-voltage drive ratings.

For intermittent demands, the allowable phase current rises to 57 A, yielding a peak stall torque of 31.00 Nm so the axis can clear static friction or handle short high-load events. Under continuous rotation, the kit outputs 585 W at its rated speed of 625 rpm, values suited to slow but force-rich positioning tasks such as index tables or collaborative-robot shoulder joints. The unframed rotor and stator weigh 4.05 kg, which the host structure must support and cool, yet the absence of extra housings keeps mass close to the axis, lowers bearing loads, and improves system responsiveness during rapid directional changes.