Product Description:

The 1MR160D-A060 rotor is supplied by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It is a frameless spindle motor component intended to couple directly with a laminated stator in machine-tool spindles, allowing high rotational accuracy without the mass of a conventional housed motor. As a dedicated rotor element, it provides the rotating magnetic field interface for automated milling, grinding, or drilling equipment. Its open, integrated format supports spindle assemblies where compact dimensions and direct mounting are required.

The mechanical interface uses an axial balancing ring thread of M6, while the ground bearing seat measures 106.3 mm in diameter for precise location inside the spindle shaft. It matches a frame size of 160, and its stacked laminations create an inner rotor bore of 60.0 mm so that the drawbar or coolant tube can pass through. Length code D indicates the active iron height associated with this rotor version. A step interference fit between the rotor and shaft resists micro-slip during rapid speed changes, and the threaded pins conform to DIN 913 for consistent axial locking. These features support accurate concentricity, controlled thermal expansion, and a practical method for balance correction in high-speed machining centers.

The rotor uses 2 pole pairs for interaction with high-frequency inverter waveforms. The mass moment is limited to 0.0121 kg·m², which helps the drive accelerate quickly without excessive overshoot, while the physical mass of 7.3 kg helps keep bending loads on the spindle bearings low. An open construction rated at IP00 means external cooling airflow and enclosure protection must be provided by the surrounding machine structure. This arrangement also reduces windage losses and supports high-speed spindle operation.