Product Description:

The MRT290D-3N-0200-BNNN rotor is produced by Bosch Rexroth Indramat for the MRT Synchronous IndraDyn T Motors series. It forms the rotating element of a direct-drive torque motor, converting the stator’s electromagnetic field into continuous low-speed, high-torque motion for indexing tables, rotary transfer stations, and other precision automation axes. By eliminating gear reduction, the rotor enables backlash-free positioning while reducing the number of mechanical components that require maintenance.

The rotor follows frame code 290, which indicates its outer dimensions and matches it to stator housings of the same size. The bore through the magnetic core measures 200 mm, allowing cable bundles or fluid lines to pass through the center of the motor. A polar inertia of 0.11 kg·m² affects acceleration profiles and drive controller tuning. Screws clamp the component directly to the machine shaft, eliminating the need for additional hubs. The rotor alone has a protection rating of IP00, so it must be enclosed within the complete motor assembly during operation. The associated liquid-cooling system supports an inlet pressure of up to 6 bar, which helps protect the mechanical joints from excessive pressure under high flow.

The acceptable storage temperature ranges from -25 to +55 °C, while the permitted temperature during short-term transport ranges from -25 to +70 °C without causing magnet degradation. During operation, the air surrounding the motor must remain between 0 and +40 °C to preserve magnetic stability and adhesive integrity. Cooling fluid may enter the circuit at a temperature from +5 to +40 °C, preventing thermal shock while providing sufficient heat removal for continuous torque production. These temperature ranges apply to different phases of handling and operation, so the appropriate limit must be observed for each condition.