Product Description:

The TBM-7646-B is a frameless torque motor set produced by Kollmorgen for the TBM Frameless Motors series. The rotor and stator are delivered without a housing so they can be built directly into compact rotary axes, gimbals, or spindle cartridges where minimal volume and direct-drive stiffness are required. By eliminating couplings and gear stages, the assembly supplies continuous electromagnetic torque for precise positioning or velocity control inside automated machinery.

This model reaches a rated speed of 1025 RPM while delivering up to 217 W of mechanical output, giving a useful balance between throughput and thermal loading in tightly packaged systems. During steady operation, the electromagnetic structure develops 2.13 N-m of continuous stall torque, and sustaining that level of torque requires only 11.8 Arms of phase current. The back electromotive force constant is 11.3 Vrms/kRPM, which indicates the voltage required from the drive to maintain speed and influences regenerative voltage during deceleration. Winding resistance is 0.245 Ω line to line at 25 °C, and inductance measures 0.4 mH, values that affect current ripple and drive tuning.

Dynamics are extended by a peak capability of 5.51 N-m torque at a momentary current of 29.4 Arms, allowing rapid acceleration or disturbance rejection without permanent heating. The laminated rotor carries an inertia of only 0.0000819 kg·m², so the motor can follow high-bandwidth command profiles with minimal overshoot. Magnetic coupling is expressed by a torque constant of 0.188 N-m/Arms, which helps estimate the current needed for a given load point. Twelve magnet poles, 0.068 N-m of static friction, 0.0281 N-m/kRPM of viscous damping, and a bare weight of 1.079 kg provide the remaining data used for servo loop modeling and mechanical integration.