MRS272D-1N-0135-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS272D-1N-0135-NNNN is part of the MRS Synchronous IndraDyn H Motors series and features an open kit motor design with plain drilling mounting style. It has a rotor inertia of 0.335 kg·m², a rotor mass of 44.5 kg, and provides an axial attractive force of 570 N with a radial attractive force of 6880 N. The motor includes 24 balancing holes, a 135 mm H6 rotor bore, and operates with IP00 protection mode.
Internal Product Review
The MRS272D-1N-0135-NNNN is an open kit synchronous motor well suited for precision direct-drive applications. IP00 construction and 6 pole pairs support efficient electromagnetic performance in integrated machine designs. High radial attractive force of 6880 N stands out as a key capability for demanding assemblies.
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Product Description:
The MRS272D-1N-0135-NNNN is a synchronous rotary component supplied by Bosch Rexroth Indramat within the MRS Synchronous IndraDyn H Motors series. Classified as an open kit motor, it is shipped without an enclosure so the stator and rotor can be integrated directly into the host machine. This configuration suits compact, high-performance automation axes where direct coupling to the driven shaft removes belt or gearbox losses and supports precise position control. Its mechanical outline and plain drilling mounting points allow direct integration into custom housings or spindles.
In service, the assembly draws an axial magnetic pull of 570 N, which sets the thrust bearing preload required inside the machine stack. The electromagnetic system contains 6 pole pairs, giving one electrical cycle for each sixth of a mechanical revolution. A close-tolerance rotor bore of 135 mm H6 permits concentric placement on hollow shafts, while the reflected inertia of 0.335 kg·m² supports smooth speed regulation during acceleration and deceleration. Because the winding space is exposed, the unit has a protection mode of IP00, so it must operate inside a sealed motor chamber or another protected installation space with controlled airflow.
Radial magnetic attraction rises to 6880 N, so the supporting bearings and frame must withstand this continuous side load during operation. The rotor weighs 44.5 kg, adding stored momentum that helps reduce minor speed fluctuations when cutting or indexing loads change abruptly. For precision balancing after coupling to a spindle sleeve, the rotor rim provides 24 x M8 x 12 mm threaded holes that accept correction screws or balancing weights. The Open Kit Motor construction uses a plain drilling mounting style, which allows the stator stack to be clamped directly and helps reduce overall drive length.
