MRT450B-3N-0350-BNNN Bosch Rexroth Indramat
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MPN: R911392309
The Bosch Rexroth Indramat MRT450B-3N-0350-BNNN is a rotor for a torque motor from the MRT Synchronous IndraDyn T Motors series. This rotor has an internal diameter of 350 mm and a mechanical frame size of 450. It weighs 13 kg and is designed for operation at ambient temperatures from 0 to 40 °C, with a permissible coolant inlet temperature between 5 and 40 °C.
Internal Product Review
The MRT450B-3N-0350-BNNN is a torque motor rotor with a 450 frame size and screw fastening that supports clean mechanical installation. IP00 construction and a 0 to +40 °C operating ambient make the design well suited for controlled machine environments. Rotor inertia of 0.45 kg·m² is a strong point for precise torque applications.
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Product Description:
The MRT450B-3N-0350-BNNN rotor is produced by Bosch Rexroth Indramat for the MRT Synchronous IndraDyn T Motors series. This unit belongs to the MBT torque motor platform and consists only of the rotating element, which is delivered separately from the stator for mounting on large-diameter hubs. Inside an automation cell, it converts electromagnetic force into direct shaft torque without mechanical gear reduction, supporting precise positioning at low speeds. The separate rotor and stator arrangement also allows the motor components to be integrated directly into specialized machine assemblies where a conventional motor housing would occupy excessive space.
The rotor fits a mechanical frame size of 450, providing a predictable outer envelope for the surrounding housing. Its magnet ring has an internal active diameter of 350 mm, allowing it to surround a substantial through-bore for cables, shafts, or media ducts. With a mass of 13.0 kg, the assembly imposes a limited static load on the supporting bearings while providing a moment of inertia of 0.45 kg·m². This inertia affects acceleration and deceleration behavior when the rotor is integrated with the stator and connected load. Axial retention is provided by screws, allowing the rotor to be secured without specialized clamping hardware.
The assembled motor is cooled by liquid circulated through the companion stator, and the cooling circuit accepts an inlet pressure of up to 6 bar. Coolant must enter at a temperature between +5 and +40 °C to maintain suitable thermal conditions around the rotor and stator. During operation, the surrounding air temperature must remain within 0 to +40 °C to limit differential thermal expansion between the motor components. During idle storage, the rotor tolerates temperatures from -25 to +55 °C, while transportation temperatures may range from -25 to +70 °C. Because the rotor is supplied as an uncovered magnet ring, it has an enclosure rating of IP00. The completed machine installation must therefore provide suitable guarding against contact, dust, and stray ferromagnetic debris.
