Product Description:

The MST210C-0027-FT-N0RN-NNNN is a frameless torque motor built by Bosch Rexroth Indramat and supplied within the MST Synchronous Torque Motors series. As a direct-drive component, it mounts inside a machine housing and delivers constant rotary force to industrial tables, gearless presses, and indexing modules, eliminating belts or gearboxes. By coupling the stator and rotor directly to the load, it improves positioning accuracy, lowers backlash, and simplifies maintenance in high-duty automation lines.

This motor uses liquid cooling to extract heat from the copper windings, allowing the stator to maintain its nominal ratings during prolonged duty cycles. Under those cooled conditions, the unit provides a continuous mechanical output of 3.40 kW and delivers 120 Nm while drawing 13.0 A from the drive amplifier. A torque constant of 9.20 Nm/A links current to shaft torque, which supports feed-forward control in torque-mode applications. The power leads exit through a single, larger-diameter cable guided through the stator end, and the coil set is stabilized by thermo-encapsulation. Electrical characteristics include a voltage constant of 0.620 V per rpm, a winding inductance of 28.6 mH, and a winding resistance of 4.9 Ω measured at 20 °C.

During acceleration, the winding can accept a peak current of 50.0 A, enabling a short-term torque of 250 Nm for overcoming high-inertia loads. Internal losses at the stated ratings reach 2.60 kW, so the cooling system must be sized accordingly. The stator mass is 11.5 kg, and the motor reaches 63 percent of its final temperature in a thermal time constant of 3.0 min, which allows rapid steady-state prediction in temperature models. Because no motor encoder is integrated, external position feedback must be provided by a resolver, incremental encoder, or direct-axis sensor matched to the motion controller.