Product Description:

The 1MR310F-A125 is a rotor component manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the rotating element inside a frameless spindle assembly, it interacts with the surrounding stator field to convert three-phase electrical energy into high-speed mechanical motion. Within automated machining centers and other industrial platforms, the part supports precise spindle acceleration and smooth continuous running, enabling accurate material removal and reduced cycle times. Because it is supplied as the rotating member rather than a complete motor, it is intended to be integrated with a matching stator and spindle hardware. Its geometry and material selection are matched to resist the centrifugal forces that arise at elevated rotational frequencies.

Key dimensional and mass properties affect how the rotor behaves in service. The frame size of 310 millimeters sets the external diameter that mates with stators of identical size classes, helping maintain a concentric magnetic gap. An internal rotor bore of 125 mm provides clearance for the spindle shaft, coolant passages, and sensor wiring. The axial length code is F, and this longer stack increases active iron volume and permits higher torque at the same supply frequency. Dynamic response is influenced by a rotational inertia of 0.723 kgm², because it affects the torque needed for a given angular acceleration and influences servo tuning. A mass of 79.2 kg adds thermal capacity for heat generated by surface losses and also affects the balancing process during assembly.

The electromagnetic layout features 3 pole pairs, which influences synchronous speed and helps limit harmonic content in high-frequency operation. Because the rotor is delivered with a protection rating of IP00, it must be installed within a housing that provides its own dust and fluid shielding. As a result, enclosure protection must be supplied by the surrounding spindle structure. Mechanical coupling to the spindle shaft uses a step interference fit, producing uniform radial pressure without additional fasteners. The formal classification Rotor for 1MB Frameless Spindle Motor identifies it as the rotor element used with matching stator parts in the same series.