Product Description:

Bosch Rexroth Indramat manufactures the MST290D-0004-FT-N0SN-NNNN torque motor as part of the MST Synchronous Torque Motors series. The unit is a permanent-magnet, outer-rotor assembly intended for direct attachment to driven shafts, allowing machines to obtain high stall torque without intermediate gear stages. In industrial automation, it is applied to indexing tables, winders, and similar stations that need precise angular positioning at very low speed while maintaining constant torque throughout sustained production cycles.

During continuous duty, the motor produces a rated torque of 350 Nm at a rated speed of 45 rpm, which equals 1.65 kW of mechanical output while drawing a rated current of 10.4 A. This operating point is supported by a back EMF, or voltage constant, of 2.190 V/rpm, so the drive electronics must apply proportional phase voltage to sustain speed under load. The 33.70 Nm/A torque constant links current to produced torque, and the 75.1 mH winding inductance with 13.9 Ω resistance influences the motor’s electrical time response and copper losses. Power conductors with a 4.0 mm² cross-section and a measured leakage capacitance of 12.6 nF must be accommodated in the cabinet layout.

For transient events, the rotor can be held motionless with a standstill torque of 365 Nm and can accelerate to a maximum electrical speed of 150 rpm. Short overload windows permit up to 700 Nm of torque when the inverter can supply a peak current of 30.0 A. Because the stator incorporates internal channels, the heat exchanger must maintain a coolant flow of 7.0 L/min to keep temperatures inside the laminated stack stable. The thermal mass reaches equilibrium in 3.3 minutes.