MRT291C-3N-0200-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRT291C-3N-0200-NNNN is a rotor for a torque motor from the MRT Synchronous IndraDyn T Motors series. This standard version has a mechanical frame size of 291 and an internal rotor diameter of 200 mm. The rotor features IP00 protection, screw fastening, and a maximum allowed coolant input pressure of 6 bar.
Internal Product Review
The MRT291C-3N-0200-NNNN is a Bosch Rexroth Indramat torque motor rotor for the MBT series, offered in a standard version with screw fastening. Technical suitability is strong for integrated motion assemblies, with 0 to +40 °C ambient operation and a permissible coolant inlet temperature of +5 to +40 °C. Low rotor inertia of 0.078 kg·m² supports responsive dynamic performance, making the component a very capable torque motor element.
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Product Description:
The MRT291C-3N-0200-NNNN rotor is manufactured by Bosch Rexroth Indramat as part of the MRT Synchronous IndraDyn T Motors series. Classified as the rotor of a torque motor in the MBT series, it houses the permanent-magnet assembly that generates drive torque when energized by the matched stator. The component is used in direct-drive tables, winders, and similar automation axes where backlash-free transmission and high positional accuracy are required. This standard version is supplied as an individual rotor core and is intended for operation with a liquid-cooled stator to manage the thermal load produced during continuous duty cycles.
The rotor body has a mechanical frame size of 291, giving it a flange diameter that matches the corresponding stator laminations. An internal rotor bore of 200 mm provides clearance for cables or pneumatic lines that may pass through the center of the machine. Dynamic response is influenced by a mass moment of inertia of 0.078 kg·m²; this relatively low inertia allows rapid acceleration while supporting high torque. Secure installation is achieved with screws placed around the periphery. The rotor has an ingress protection rating of IP00, so the assembly must be enclosed within the machine. Liquid circulation lines connect to the stator cooling system, which accepts a maximum coolant inlet pressure of 6 bar.
The permitted operating ambient temperature range is 0 to +40 °C, helping the permanent magnets remain stable during production cycles. For warehouse storage, the unit can withstand temperatures from −25 to +55 °C. During transportation, it can withstand temperatures from −25 to +70 °C. The cooling medium must enter the motor housing at a temperature from +5 to +40 °C to reduce the risk of condensation and thermal shock. Proper control of the coolant temperature is especially important when the surrounding air is humid or when the machine has recently been moved between areas with different temperatures.
