Product Description:

The 1MR160F-B074/S001 rotor is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It serves as the rotating element of a 1MB frameless spindle motor, converting drive energy into the high rotational speed used in machining centers and other rapid-cycle automation equipment. Because it is supplied as a rotor rather than a complete motor assembly, it can be integrated into a custom stator housing and spindle structure. This layout lets the spindle designer place bearings, cooling parts, and the surrounding housing according to the machine's space and speed requirements. The rotor is intended for installations where the motor components are built into the machine instead of mounted as a separate housed unit.

With a frame size of 160, the rotor fits stators that share this bore and stack diameter, which sets the radial envelope of the finished spindle. Matching this size to the stator helps maintain the correct air gap for stable high-speed operation. The length code F indicates the longest active stack used for this size, and in this version it corresponds to an L3 magnetic length of 200 mm. The extended magnetic length increases the active area for torque production without requiring a larger diameter. The rotor weighs 10.2 kg, and its mass distribution produces a moment of inertia of 0.016 kg·m². That low inertia supports quick acceleration and deceleration during speed changes while helping limit the energy drawn by the drive.

The rotor uses 2 pole pairs to support the high base speed required in grinding and milling heads. Because it is supplied as an uncovered rotor, the protection rating is IP00, so sealing must be provided by the surrounding machine enclosure. As a result, the rotor is intended to operate inside an enclosed spindle system rather than as an exposed component. The mechanical length from the laminated core to the shaft seat, identified as L4, is 132 mm, which gives a clear reference for bearing placement. Axial retention uses threaded pins that follow DIN 913, allowing secure fastening with standard hardware.