MRS312F-1N-0170-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS312F-1N-0170-NNNN is part of the MRS Synchronous IndraDyn H Motors series and features a protection class of IP00. This motor has 7 pole pairs and a smooth rotor drilling style, with a rotor mass of 79.5 kilograms and an inertia of 0.885 kg·m². The internal diameter of the rotor is 170 mm, and it supports storage temperatures from -20 to +80 degrees Celsius.
Internal Product Review
The MRS312F-1N-0170-NNNN is a Bosch Rexroth Indramat synchronous motor rotor built for IndraDyn H motion applications. A 7-pole-pair configuration and smooth rotor drilling support stable electromagnetic behavior and clean mechanical integration. Rotor inertia of 0.885 kg·m² gives the assembly a well-balanced performance profile for demanding motion systems.
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Product Description:
The MRS312F-1N-0170-NNNN is a built-in synchronous motor supplied by Bosch Rexroth Indramat as part of the MRS Synchronous IndraDyn H Motors series. Designed for direct integration into machine frames, the unit combines its compact stator with a separable rotor so high torque can be delivered without intermediate gear stages. Within automated machining centers, printing lines, or packaging axes, the motor converts drive inverter current into precise rotational motion, enabling position and speed control that meet demanding cycle-time requirements. Because the rotor mounts directly on the driven shaft, the arrangement helps avoid backlash and compliance that can appear in belt or gearbox stages.
The motor uses 7 pole pairs, creating a 14-pole magnetic field that supports high torque at moderate electrical frequencies. The housing carries a protection rating of IP00, so the motor must be installed inside a sealed machine enclosure where separate cooling and guarding are provided by the surrounding equipment. This layout is typical for built-in motors, where the machine structure rather than an external housing supplies the protective barrier. Dynamic behavior is influenced by a rotor inertia of 0.885 kg·m², which adds resistance to rapid speed changes while still allowing responsive servo control. Manufacturing variance is controlled to within ±10% of the listed inertia, helping maintain consistent axis response across units of the same type.
The built-in design uses a rotor bore with smooth rotor drilling, giving a concentric clamping surface that fits a spindle shaft with an internal diameter of 170 mm. The smooth bore is intended for a clamped spindle interface rather than a keyed shaft connection. Total rotating weight is 79.5 kg, a value that must be considered during bearing selection and acceleration calculations. Long-term reliability during transport or warehouse staging is supported by a permissible storage range of -20 to +80 °C. The component can be paired with matching stator modules, temperature sensors, and drive controllers in direct-drive systems that require high torque density and repeatable alignment.
