Product Description:

The 1MR241D-A111 is a rotor for integration into 1MB High-Speed Asynchronous Motors series spindle assemblies. As a dedicated rotating element for frameless motors, it is used in machine-tool spindles and other industrial automation equipment where compact geometry and high peripheral velocity are required to transmit torque efficiently at elevated speeds. In a frameless spindle, the rotor works with a matching stator to generate torque without adding a separate motor housing. Tight production tolerances maintained by Bosch Rexroth Indramat support reliable high-speed operation when the rotor is paired with matched laminations, bearings, and sensor feedback components.

This rotor belongs to frame size 241, which matches it to stators in the same size class. An inside diameter of 111 mm provides the central bore needed for drawbar or shaft components used in spindle designs. The maximum mechanical limit is 9000 rpm, so the operating speed must stay within a safe margin to limit mechanical stress. A rotor inertia of 0.135 kg·m² affects the torque required for acceleration and deceleration, which influences cycle times in tapping, drilling, or grinding processes. The electrical layout uses 3 pole pairs, which sets the synchronous speed relationship for a given line frequency and influences pull-out behavior during abrupt load changes. This combination is suited to spindle applications that require stable rotation and predictable speed changes under varying loads.

Motor length code D indicates the axial stack height. An IP00 protection code means the rotor has no built-in enclosure, so it must operate inside a stator housing that provides cooling and contamination barriers. Because the rotor itself is exposed, protection against debris and accidental contact must come from the surrounding spindle structure. Mechanical coupling uses a step interference fit, which helps maintain concentric alignment and slip-free torque transfer after the assembly is heat-shrunk together.