MRS312D-2N-0112-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS312D-2N-0112-NNNN is part of the MRS Synchronous IndraDyn H Motors series and features a frame size of 312 with a frame length of D. It uses step interference fit mounting, has a rotor inertia of 0.969 kg·m², and a rotor mass of 108.6 kg. The motor includes an O-ring made of 75 FKM material, sized at 112 x 4 mm.
Internal Product Review
The MRS312D-2N-0112-NNNN is a Bosch Rexroth Indramat MRS synchronous IndraDyn H motor with frame size 312 and frame length D. Step interference fit mounting and 0.969 kg·m² rotor inertia support secure mechanical integration and stable running characteristics. The 75 FKM O-ring material adds dependable sealing, making this motor an excellent choice for demanding drive systems.
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Product Description:
The MRS312D-2N-0112-NNNN rotor belongs to the MRS Synchronous IndraDyn H Motors series. It functions as the rotating core of a high-torque synchronous motor, converting electromagnetic fields into mechanical rotation for material-handling lines, pressing stations, and other automated equipment. In operation, the rotor works with a matching stator to generate controlled torque and stable rotary motion across demanding industrial duty cycles. This type of rotor is suited for applications that require smooth low-speed performance, accurate speed control, and repeatable motion under changing loads.
Its frame length is D, and it matches the 312 frame size used for the corresponding motor assembly. Those dimensions align with IEC mechanical interface tables, allowing direct coupling to gearboxes and belt pulleys used in conveyor drives. A step interference fit mounting interface locks the hub to the shaft, eliminating micro-movement under rapid load reversals. The solid steel body weighs 108.6 kg, and its polar moment of inertia is 0.969 kg·m², which the drive uses to determine acceleration behavior and braking response for the connected axis. The combination of mass and inertia also helps the axis resist abrupt speed changes during repeated starts and stops.
The central bore is machined to 112 mm, letting the rotor seat directly on standard hollow shafts without sleeves. Seal integrity at this interface is maintained by an O-ring made of 75 FKM. The ring has a cross section of 112 × 4 mm, which fills the gland and helps prevent lubricant migration into the air gap. Using the bore directly on the shaft helps keep the rotor centered within the motor assembly. The rotor is intended for stators supplied by Bosch Rexroth Indramat, where the bore and seal dimensions help maintain consistent magnetic clearance during thermal cycling and frequent start-stop operation.
