Product Description:

The MRS272F-2N-0125-NNNN rotor unit is produced by Bosch Rexroth Indramat for the MRS Synchronous IndraDyn H Motors series. As the rotating element in these permanent-magnet synchronous machines, it supplies torque when paired with a matching stator and drive, allowing precise speed control in industrial automation cells, test stands, and packaging lines. Its dimensional code, mechanical seating features, and mass properties are predefined so the rotor can be installed in heavy-duty housings without secondary machining.

The unit provides a 125 mm internal rotor diameter, giving a clear bore for through-shaft assemblies or coolant lines. Around this bore, the laminated core expands to a Ø198(+0.15) mm outer diameter that mates with the stator air gap. End-to-end, the rotor measures 444(+0/-0.5) mm overall length, a tolerance window that simplifies alignment with end shields. Installation is accomplished through a step interference fit, and the bore is finished to a H6 rotor bore tolerance so the shaft seating can withstand repeated thermal cycles. Twenty-four M8 × 12 mm balancing holes permit trim balancing, while two M6 × 12 mm oil connection ports and a 125 × 4.75 FKM O-ring seat support closed-loop oil cooling rings.

Electrical performance is tied to the magnetic layout of 6 pole pairs, enabling synchronous operation with IndraDrive converters over a wide frequency span. Dynamic response is influenced by the 0.433 kg·m² rotor inertia, which moderates acceleration peaks while still allowing rapid speed changes when commanded by the drive. The total rotor mass is 60.4 kg, a figure that must be considered when specifying bearings and couplings. The open construction carries an IP00 protection code, so the rotor must run inside an enclosed housing where contamination control and active oil circulation are already provided.