Product Description:

The TBM-7631-B frameless motor is manufactured by Kollmorgen as part of the TBM Frameless Motors series. Supplied without a housing, the rotor and stator are embedded directly into the end product's mechanics, allowing robotic joints, pan-tilt stages, and compact rotary axes to use a shorter drive chain and improve dynamic response in industrial automation. Because it is a frameless design, the surrounding assembly provides the bearing support and alignment normally supplied by a conventional motor housing.

This model delivers a continuous stall torque of 1.64 N-m while drawing only 10.6 Arms of continuous stall current, so heat rise stays manageable in tight enclosures. A torque constant of 0.159 N-m/Arms links output torque to phase current, and the back-EMF constant of 9.62 Vrms/kRPM indicates the voltage produced as speed increases. With a rated speed of 1210 RPM, the motor supports moderate rotational rates that suit articulated arms and mobile platforms. Electrical losses are limited by 0.281 Ω line-to-line resistance, and 0.42 mH inductance helps shape current ripple when the motor is paired with a PWM servo amplifier. Mechanical drag is kept low by 0.05 N-m of static friction, while 0.016 N-m/kRPM of viscous damping describes the speed-dependent portion of the drag torque.

For transient events, the motor tolerates a peak stall torque of 4.6 N-m at up to 29.4 Arms, giving extra headroom for rapid acceleration and disturbance rejection. The rated power of 190 W at a supply voltage of 24 VDC fits common low-voltage bus architectures used in battery-powered and safety-related machinery. A rotor inertia of 5.64 × 10⁻⁵ kg·m² supports quick directional changes, and the total motor weight is 0.738 kg, which helps limit the mass added to moving axes. In compact motion systems, direct integration reduces the need for extra couplings and can limit compliance in the drive path.