Product Description:

The Bosch Rexroth Indramat 1MR105N-B040 is supplied as the rotor component for a 1MB High-Speed Asynchronous Motor. Within the 1MB High-Speed Asynchronous Motors series, this open-framed element mates with a separate stator to form a compact spindle drive. In machine tools and test rigs, the rotor converts the stator’s rotating field into mechanical motion at high speed for grinding, drilling, and milling spindles. Because the rotor is supplied as a separate component, it is intended for systems that integrate the motor directly into the spindle rather than using a fully enclosed motor housing.

The assembly has an open kit motor construction, so it must be housed inside the user’s spindle shaft for cooling and shielding. Its IP00 protection class means that no sealing is provided, so isolation depends on the machine enclosure. A permissible mechanical speed of 22,000 rpm supports high surface speed in spindle applications. The rotor has a polar moment of inertia of 0.0034 kg·m², which helps the spindle accelerate quickly without excessive torque demand. The steel stack and shaft weigh 2.8 kg, which keeps the rotating mass relatively low during cyclic operation. Operation is permitted at ambient temperatures up to 40 °C, and higher temperatures require added cooling at the spindle housing.

Installation is permitted at altitudes up to 1000 m above sea level before additional derating is required. Electrical connection is simplified because the stator is supplied with a Connection Cable, which reduces separate lead preparation during assembly. For dimensional matching, this rotor uses length code N, which helps align the active stack length with the surrounding spindle layout. The open rotor format also requires the surrounding machine structure to provide physical protection and stable support for the rotating assembly during operation.