MRS102B-2N-0035-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS102B-2N-0035-NNNN is part of the MRS Synchronous IndraDyn H Motors series and features a 35 mm inner rotor diameter. This open kit motor includes a step interference fit mounting style and has a rotor inertia of 0.003 kg·m². The motor has three pole pairs, an IP00 protection class, and weighs 4.7 kg unpacked.
Internal Product Review
The MRS102B-2N-0035-NNNN is an open kit motor from the Bosch Rexroth IndraDyn H synchronous motor line, and the 3 pole-pair design supports smooth electromagnetic operation. Step interference fit mounting paired with 0.003 kg·m² rotor inertia gives the assembly a precise, responsive feel for high-quality servo integration.
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Product Description:
The MRS102B-2N-0035-NNNN belongs to the MRS Synchronous IndraDyn H Motors series manufactured by Bosch Rexroth Indramat. It is supplied as a frameless motor kit that integrates directly into machine structures to generate torque for rotary axes without the bulk of a housed servo unit. By allowing the machine to mount stator and rotor components within a custom enclosure, this motor supports compact, high-precision motion stages used in semiconductor tools, indexing tables, and similar industrial automation equipment. The frameless format also leaves bearing selection and surrounding structural support to the host assembly, which helps when space and stiffness requirements vary between machine layouts.
The rotor has an inner bore of 35 mm, allowing shafts or utility lines to pass through the center of the motor. Dynamic behavior is influenced by a rotor inertia of 0.003 kg·m², which aids fast acceleration while maintaining smooth velocity regulation. Magnetic excitation is produced by 3 pole pairs, so synchronous speed is matched to drive frequency with minimal cogging. A rotor mass of 3.2 kg keeps the moving assembly lightweight for highly responsive axes, and the overall motor design is classified as Open (Kit Motor), indicating that cooling and sealing must be provided by the host machine. This arrangement suits direct-drive applications that need compact geometry and smooth motion without a separate gearbox.
For axial retention, the rotor uses a Step Interference Fit on the shaft, delivering positive torque transmission without keys or screws. Contact sealing between the stator and housing is handled by a 75FKM O-ring that measures 35 × 4 mm, providing chemical resistance against lubricants commonly present in automated equipment. Because the assembly ships with a protection class of IP00, it must be installed inside a clean, enclosed chamber where contaminants and moisture are already controlled. Proper alignment during assembly is important because the stator and rotor are installed as separate parts inside the machine structure. The unpacked subassemblies weigh 4.7 kg, which helps limit the mass added during installation and handling.
