MRS162D-1N-0068-NNNN Bosch Rexroth Indramat
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MPN: R911310491
The Bosch Rexroth Indramat MRS162D-1N-0068-NNNN is part of the MRS Synchronous IndraDyn H Motors series and utilizes a shrink fit assembly method with a smooth bore. This motor features an internal rotor diameter of 68 mm, has four pole pairs, and a steel sleeve rotor with permanent magnets. It offers IP00 protection and the rotor weighs 8.8 kg with an inertia of 0.018 kgm².
Internal Product Review
The MRS162D-1N-0068-NNNN is a Bosch Rexroth Indramat synchronous motor rotor well suited for precise servo applications. Shrink-fit assembly and a smooth bore support clean mechanical integration and dependable mounting quality. Steel-sleeve construction with permanent magnets and 4 pole pairs give this rotor strong electromagnetic performance.
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Product Description:
The MRS162D-1N-0068-NNNN is an internal rotor supplied by Bosch Rexroth Indramat for the MRS Synchronous IndraDyn H Motors series. When paired with the matching stator, this component forms a frameless torque motor that drives indexing tables, presses, and other direct-drive axes in industrial automation. Its magnetic circuit converts stator currents into smooth, high-torque rotation, eliminating belts or gearboxes and reducing mechanical backlash in precision motion tasks. Because the rotor is frameless, the surrounding machine structure provides the bearings and housing, which helps keep the drive compact around large rotary loads.
Assembly to the machine shaft is performed with a shrink fit interference joint that delivers a rigid, backlash-free connection under load. The rotor’s bore has a smooth bore profile, so torque transfer depends entirely on the interference pressure rather than keys or splines. A clearance of 68 mm through the center allows routing of utility lines while keeping rotor mass concentrated near the magnetic sleeve. Electromagnetic design features 4 pole pairs, so each electrical cycle produces eight alternating magnetic poles around the circumference, balancing low-speed torque density with servo responsiveness. This layout also leaves the rotating body free of protruding drive features, which helps maintain even mass distribution during operation.
System integration must consider the open construction rated at IP00, so the rotor needs placement inside a protected housing to avoid contact with conductive debris. Its magnet carrier uses a steel sleeve with permanent magnets, giving high flux while mechanically restraining the magnets at elevated peripheral speeds. Inertia is specified at 0.018 kg·m², which helps moderate acceleration spikes while supporting stable rotation at steady speed. The total rotating mass of 8.8 kg affects bearing selection and balance requirements in the surrounding machine assembly. Used with servo drives from Bosch Rexroth Indramat, the rotor supports closed-loop current control for accurate torque production across its speed range.
