MRT360B-3N-0260-BNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRT360B-3N-0260-BNNN is a rotor designed for torque motors and is part of the MRT Synchronous IndraDyn T Motors series. It features an internal rotor diameter of 260 millimeters with a mechanical frame size of 360 and a rotor mass of 9.8 kilograms. The rotor supports a permissible coolant inlet temperature from 5 to 40 degrees Celsius and has an allowable operating ambient temperature from 0 to 40 degrees Celsius.
Internal Product Review
The MRT360B-3N-0260-BNNN is a torque motor rotor for IndraDyn T applications, configured in frame size 360 with screw fastening. Cooling integration is well supported by a permissible coolant inlet temperature of +5 to +40 °C and a maximum coolant input pressure of 6 bar. The 0.19 kg·m² rotor inertia gives the unit a well-balanced profile for precise torque motor performance.
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Product Description:
The MRT360B-3N-0260-BNNN rotor is manufactured by Bosch Rexroth Indramat as part of the MRT Synchronous IndraDyn T Motors series. It is the rotating element for an MBT torque motor and is designed to generate high continuous torque directly on the application load. This direct-drive arrangement eliminates gearboxes in indexing tables, printing cylinders, and similar automation axes, reducing the number of mechanical transmission components between the motor and the driven equipment.
The rotor has an internal diameter of 260 mm, providing the required central clearance while helping maintain a consistent magnetic air gap. Its mechanical frame size code is 360, indicating the outer lamination diameter used across this segment of the series. Dynamic behavior is affected by a polar moment of inertia of 0.19 kg·m², which influences angular acceleration and the response time when the drive applies torque. A bare mass of 9.8 kg affects bearing preload and machine balancing requirements during installation. The component is secured to the machine shaft with screws, providing concentric clamping without requiring an additional hub. Correct alignment between the rotor and stator is important because the open motor design depends on the surrounding machine structure to support the motor components and preserve the necessary operating clearances.
To maintain thermal stability around the rotor-stator interface, the housing accepts liquid coolant at pressures up to 6 bar. The inlet coolant temperature must remain between +5 and +40 °C, which helps keep the magnetic assembly below its demagnetization threshold during demanding duty cycles. During operation, the surrounding air temperature must remain within 0 to +40 °C so the motor windings and adjacent sensors stay within their permitted temperature limits. Because the rotor is supplied as an open component with an ingress protection rating of IP00, it must be installed inside an enclosed stator or machine frame where contact with foreign objects and moisture is controlled. Storage temperatures as low as -25 °C and transport temperatures as high as +70 °C are permissible without affecting alignment or magnet strength. The cooling circuit should be integrated with the machine so coolant can circulate around the active motor area without leaking into nearby bearings, sensors, or electrical connections.
