MRT291Z-3N-0080-S005 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRT291Z-3N-0080-S005 is a rotor for a torque motor and is part of the MRT Synchronous IndraDyn T Motors series. It features an internal rotor diameter of 80 millimeters and a mechanical frame size of 291. The rotor has an IP00 protection rating and is fastened by screws, with maximum allowed coolant input pressure of 6 bar.
Internal Product Review
The MRT291Z-3N-0080-S005 is a Bosch Rexroth Indramat torque motor rotor designed for secure screw fastening. An operating ambient range of 0 to +40 °C and a permissible coolant inlet temperature of +5 to +40 °C support dependable thermal management in direct-drive systems. A well-engineered choice for torque motor assemblies requiring consistent mechanical integration and stable cooling performance.
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Product Description:
The MRT291Z-3N-0080-S005 is manufactured by Bosch Rexroth Indramat as part of the MRT Synchronous IndraDyn T Motors series. It is supplied as the rotor component of an MBT torque motor and is intended to provide high continuous torque in direct-drive rotary tables and similar automation axes. When integrated with its matching stator and cooling system, this laminated iron core transmits magnetic flux directly to the machine shaft, eliminating belts or gearboxes and allowing precise position control in industrial machining and forming equipment.
The rotor has an internal diameter of 80 mm to accommodate large spindle shafts or hollow-through designs for cabling and media passages. Its mechanical frame size of 291 matches the outer dimensions of MRT torque motors so the active lamination stack aligns with the stator’s pole pitch. The rotor uses screw-based axial retention, providing a simple mechanical interface that keeps the magnetic air gap constant under load reversals. Efficient liquid cooling of the surrounding stator requires the supply circuit to remain below the maximum inlet pressure of 6 bar; this pressure limit prevents leakage at rotary seals. Thermal stability of the magnet system is maintained when coolant arrives within the inlet temperature range of +5 to +40 °C, ensuring the permanent magnets remain within their recommended operating field strength.
During production shifts, the assembly can operate in ambient air from 0 to +40 °C without derating, making it suitable for climate-controlled machine halls. For warehouse or dockside storage, the magnetic core tolerates temperatures from -25 to +55 °C, while short-term transportation permits temperatures up to +70 °C without risk of demagnetization. The open construction carries an IP00 rating, so the rotor must be installed inside a stator housing or protective enclosure that shields active parts from contact and contamination.
