TBMS-7615-A Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen TBMS-7615-A is part of the TBM Frameless Motors series and has a continuous stall torque of 0.939 Newton-meters with a continuous stall current of 8.57 Arms. This motor offers a rated power of 258 Watts and operates at a rated speed of 3930 RPM. It weighs 0.435 Kilograms and is designed for 48 VDC operation.
Internal Product Review
The TBMS-7615-A is a Kollmorgen TBM frameless motor designed for efficient servo integration, with a 48 VDC rating and 258 W rated power. Continuous stall torque of 0.939 N-m supports stable low-speed performance, while 3.04 N-m peak stall torque gives the motor strong short-term acceleration capability.
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Product Description:
The TBMS-7615-A is a frameless permanent-magnet motor segment produced by Kollmorgen within the TBM Frameless Motors series. Supplied as a rotor-stator kit rather than a housed unit, it is intended to be embedded directly into gimbals, joint modules, or other compact axes where space and weight reduction are critical. Because the kit has no external housing, the surrounding machine structure provides bearing support, alignment, and a path for heat transfer. When paired with an external servo drive, the motor provides direct torque to the load, eliminating gear trains and enabling smooth, high-resolution motion in industrial automation assemblies that demand precise speed control.
The winding is optimized for a bus of 48 VDC, so drive selection must guarantee adequate current at that voltage. At stall, the motor delivers 0.939 N-m of continuous torque while drawing 8.57 Arms, a level set by the copper losses and thermal limits of the stator. The phase inductance of 0.4 mH and a DC resistance of 0.37 ohms set the electrical time constant the drive must overcome for fast current regulation. Under nominal thermal conditions, the rotor can spin at a rated speed of 3930 RPM, and the 0.435 kg mass keeps the installation light. Static friction is limited to 0.032 N-m, and viscous damping adds only 0.00605 N-m/kRPM during rotation. These low mechanical losses help the axis maintain smooth motion during light-load moves and frequent reversals.
For short-duration demands, the electromagnetic circuit can reach a peak torque of 3.04 N-m when supplied with 29.4 Arms, giving ample headroom for acceleration events. The back electromotive force constant is 6.85 Vrms/kRPM, so the drive must tolerate this voltage when the shaft is driven externally. Torque production scales linearly with current through the 0.113 N-m/Arms constant, simplifying current-mode control loops. A rotor inertia of 0.0000304 kg-m² supports fast position updates without overshoot, and the thermal design allows a rated mechanical output of 258 W to be delivered continuously at the specified base speed.
