Product Description:

The MST290F-0020-FT-N0CN-D303 is a synchronous torque motor module produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. Designed for direct-drive rotary axes and indexing tables, the motor delivers high continuous torque without gearing, which helps reduce backlash in precision positioning applications. Its frameless stator-rotor construction integrates directly into the machine housing, allowing OEMs to maintain high stiffness at low speeds while reducing wear from intermediate mechanical components. This layout is well suited for large rotary platforms that need smooth motion, repeatable positioning, and compact integration inside the surrounding machine structure.

The stator uses liquid cooling, so heat is removed by circulating coolant rather than by ambient air alone. At the rated point, the phase draws 39.9 A and turns at 265 rpm, developing 715 Nm of continuous torque. A torque constant of 17.92 Nm/A means the motor produces substantial torque with relatively low speed, which is useful for direct-drive tables and other high-inertia loads. Power enters through a stator-side cable with a larger outside diameter, and the conductor uses AWG 8 with a minimum copper area of 10.0 mm² to help limit resistive losses near nominal current.

Beyond the nominal point, the unit delivers a standstill holding torque of 755 Nm and can reach a peak of 1450 Nm for short acceleration bursts. Electrical speed capability extends to 425 rpm, limited by the back-EMF coefficient of 1.204 V/rpm and the phase winding resistance of 1.74 ohms, which increase the inverter voltage demand as speed rises. The encapsulated windings are bonded with thermal compound to improve vibration tolerance and dielectric strength during repeated duty cycles. The motor is supplied without an integrated encoder, so an external feedback device must be added to provide position data for the connected control system.