MRT291Z-3N-0080-S004 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRT291Z-3N-0080-S004 is part of the MRT Synchronous IndraDyn T Motors series and features an open kit motor design with water as the cooling medium. This model has an axial attraction force of 290 Newtons, a radial attraction force of 530 Newtons, and is rated with IP00 protection. It operates at a sound pressure level under 75 decibels and uses a reference DC bus voltage of 540 VDC.
Internal Product Review
The MRT291Z-3N-0080-S004 is an open kit synchronous motor in the Bosch Rexroth Indramat MRT series with water cooling for effective thermal control. Support for S1 and S6 operation with a 540 VDC reference DC bus makes the unit well suited for continuous-duty motion systems. Low acoustic output below 75 dB(A) adds refinement to a highly capable direct-drive motor package.
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Product Description:
The MRT291Z-3N-0080-S004 is a frameless torque motor supplied by Bosch Rexroth Indramat within the MRT Synchronous IndraDyn T Motors series. As an open stator-rotor kit, it is integrated directly into machine structures where high continuous torque and low cogging are needed for indexing tables, rotary axes, and tool spindles. In industrial automation, it works as a direct-drive element, eliminating gear reductions and improving positional accuracy and dynamic response. This arrangement also allows the motor to become part of the machine structure instead of being mounted as a fully enclosed stand-alone unit.
The MRT291Z rotor induces both axial and radial magnetic preload on adjacent bearings; the specified axial attraction reaches 290 N, while radial pull peaks at 530 N. Cooling is achieved with circulating water, so the user must provide a closed-loop circuit that maintains a stable inlet temperature during continuous duty. Electrical connection is sized for a reference DC bus of 540 VDC, matching standard IndraDrive power stages without additional isolation transformers. Because the motor kit is open, it carries a protection rating of IP00, meaning that it must be installed inside the machine envelope to prevent contact with dust or tools. These values affect installation clearances, bearing selection, and electrical cabinet layout.
Permanent-magnet integrity is safeguarded up to 300 °C; above that temperature, coercive force drops irreversibly, so temperature monitoring is required. If an overload event pushes the magnets to this threshold, recovery time is governed by a demagnetization hold interval of 30 min before safe re-energizing. The motor supports continuous S1 operation as well as intermittent S6 cycles, which suits both steady rotation and repeated indexing sequences with dwell periods. Acoustic emissions stay below <75 dB(A), helping the surrounding machine operate at a lower noise level. These thermal and duty characteristics are important when the motor is built into compact equipment with limited airflow and high torque demand.
