MRT251F-3N-0145-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRT251F-3N-0145-NNNN is part of the MRT Synchronous IndraDyn T Motors series and has a fast rotor inertia of 0.08500 kg·m² along with a rotor mass of 16 kilograms. It features a maximum mechanical speed of 1500 rpm and allows for a permissible radial force of 2460 Newtons and axial force of 250 Newtons.
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Product Description:
The MRT251F-3N-0145-NNNN is a frameless permanent-magnet torque motor supplied by Bosch Rexroth Indramat under the MRT Synchronous IndraDyn T Motors series. Delivered as separate rotor and stator components, it is intended for direct integration into machine frames where slow, accurately regulated rotation is essential, such as printing cylinders, indexing tables, or winding stations. Removing mechanical transmission elements improves stiffness, reduces maintenance requirements, and allows the drive system to command torque and position with high fidelity. The frameless configuration also allows the surrounding machine structure to provide the housing, cooling arrangement, and supporting bearings required for the application.
The rotor has a peak shaft speed of 1500 rpm, so the control system must prevent operation beyond this limit. Acceleration behavior is governed by a rotor inertia of 0.08500 kg·m², which allows motion-control calculations to account for the rotor’s resistance to changes in speed. The magnetic steel core has a mass of 16.0 kg, which must be considered when sizing the surrounding structure and handling the assembly. A precision M6 thread with a depth of 14 mm in the hub accommodates extraction bolts during removal. The interface uses a tapped hub, providing a direct threaded connection without requiring a separate extraction feature. Proper control of acceleration and shaft speed helps prevent excessive current demand and protects the rotor from overspeed conditions.
The stator flange has 30 evenly spaced fastening holes, allowing uniform preload around the mounting surface and helping minimize vibration under cyclic torque. Axial thrust must not exceed 250 N to protect the supporting bearing arrangement and maintain the required magnetic air gap. Radial forces from a belt or pinion must remain at or below 2460 N at the stated overhang distance. The machine structure must support these external loads without allowing movement between the rotor and stator. Maintaining the required alignment reduces uneven magnetic loading and helps prevent contact across the air gap during operation. The fastening pattern also distributes clamping force around the stator flange, supporting stable integration into a direct-drive machine frame.
