Product Description:

The TBMS-7631-B is a frameless brushless motor kit produced by Kollmorgen within the TBM Frameless Motors series. Supplied as separate rotor and stator components, it is intended to be built directly into the mechanical structure of compact axes, gimbals, or articulated joints where space is limited. Once integrated, the motor delivers direct-drive torque without gear reductions, allowing precise position control and smooth velocity regulation in industrial automation platforms such as semiconductor handling equipment, collaborative robots, and portable medical devices.

The motor operates from a DC bus of 24 VDC, a level commonly available in low-voltage motion subsystems, so no additional step-up converters are required. At its rated point, it reaches 1210 RPM, balancing speed with thermal limits to avoid continuous overheating. Mechanical output at that operating point is 190 W, matching small-frame actuators that must deliver moderate power while remaining lightweight. When held stationary, the winding can continuously develop 1.64 N-m of torque, providing the force needed to maintain load position against gravity or static friction. That stall capability is supported by a root-mean-square phase current of 10.6 Arms, which determines the sizing of the servo drive current loop and cabling. The line-to-line inductance of 0.42 mH shapes current ripple, while the 0.281 Ω resistance contributes to copper losses that must be removed by the host structure's thermal path.

During rapid acceleration, the electromagnetic circuit can momentarily produce 4.6 N-m, and the drive must limit peak current to 29.4 Arms to stay within winding insulation limits. The generated back electromotive force rises with speed at 9.62 Vrms/kRPM, which lets the controller predict voltage margin at top velocity. Dynamic response is aided by the low rotor inertia of 0.0000564 kg-m², so commanded speed changes translate to minimal phase lag. Static friction is only 0.05 N-m and viscous damping is 0.016 N-m/kRPM, factors that simplify loop tuning. The assembly weighs 0.738 kg, easing integration on payload-sensitive axes and reducing reflected mass in high-speed mechanisms.