Product Description:

Bosch Rexroth Indramat manufactures the MST290D-0004-FT-N0CN-NNNN as part of its MST Synchronous Torque Motors series. The motor is a frameless, permanently excited torque unit intended for direct-drive rotary positioning or indexing systems in industrial automation. By transmitting torque without gearboxes, it improves accuracy and reduces maintenance, while its hollow, jacket-cooled stator simplifies integration into machine frames and minimizes overall drivetrain inertia.

Thermal management relies on Water cooling through a 135 mm jacket that surrounds the winding stack, keeping copper temperatures within limits while the shaft turns at the rated speed of 45 rpm. At this operating point the motor produces 350 Nm of continuous torque, draws 10.4 A of phase current, and outputs 1.65 kW of mechanical power. When the rotor is locked, a standstill current of 11.6 A maintains torque without excessive heat, and the drive can momentarily deliver a maximum current of 30 A during acceleration or load shocks.

Additional electrical and mechanical parameters clarify system integration. The housing outside diameter is 310 mm, and the assembly carries a protection rating of IP00, so it must be installed inside a guarded machine enclosure. For peak load steps the motor can generate 700 Nm of torque, aided by a torque constant of 33.70 Nm/A that links drive current to mechanical output. The back-EMF slope is 2.190 V per min⁻¹, which the inverter uses for commutation and field-weakening limits. Magnetic circuit dynamics are influenced by a winding inductance of 75.1 mH, while a winding resistance of 13.9 Ω governs steady-state copper losses. Together, these values help engineers size cables, fuses, and cooling circuits for continuous duty.