Product Description:

The MST210A-0027-FT-N0CN-D303 is a torque motor built by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. As a frameless stator assembly, it is intended for direct-drive rotary axes where precise low-speed motion and high torque are required, such as indexing tables or print cylinders. In these installations, the motor’s electromagnetic field is applied directly to the load without intermediate gearing, which shortens the drive train and improves positioning accuracy in industrial automation. This direct-drive arrangement removes belts, gearboxes, and other transmission elements that can add backlash or compliance to a rotary axis. That layout is useful in machines that need smooth rotation, precise indexing, or stable torque at low speed.

The unit delivers a continuous shaft torque of 50 Nm at a rated speed of 400 rpm. Its continuous mechanical output is 2.1 kW. Supplying this output requires a phase current of 7 A, which suits medium-capacity inverters. Thermal stability is managed by water cooling that circulates through an open aluminum jacket with an outer diameter of 230 mm and an axial length of 75 mm. The cooling jacket removes copper and iron losses directly from the stator core, which helps limit temperature rise in the windings. Because the encapsulation is an open aluminum cooling jacket, the stator must be integrated into a housing that maintains coolant flow and sealing.

For short bursts, the electromagnetic system can generate up to 120 Nm while drawing a peak phase current of 25 A, allowing rapid indexing or acceleration. The protection code is IP00, so the surrounding machine structure must provide guarding against dust and fluids. Even with integrated cooling channels, the stator weighs only 7.2 kg, which helps keep added mass low during installation and axis design. Peak demand should be limited to brief operating intervals so the motor stays within its thermal operating range.