Product Description:

The 1MR160N-A060 is a rotor element manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the rotating core of a frameless spindle motor, it couples to an external stator and transmits torque directly to precision tool holders in automated machining centers and grinding spindles. This component is supplied as a bare rotor so the machine builder can integrate it into a custom housing that meets the mechanical and thermal demands of high-speed industrial automation.

The balancing ring thread is sized at M6, allowing attachment of correction screws to minimize residual imbalance during dynamic balancing procedures. A series frame size of 160 indicates the stator interface diameter class and aligns the rotor with complementary 1MB stator laminations. Its inner bore measures 60.0 mm, providing clearance for the drawbar or coolant tube, while the laminated stack’s outer surface spans 106.3 mm for a close running air gap. The rotor uses 2 pole pairs, which set the synchronous speed relationship to inverter frequency for high-speed operation. It is built with a step interference fit so it mates tightly with the shrink-fit shaft, and two pressure-oil ports permit controlled installation and removal by injecting hydraulic oil between the mating surfaces.

The rotor has a protection rating of IP00, indicating that it is delivered without its own enclosure and must be used inside a sealed spindle housing. A mass moment of inertia of 0.0267 kgm² gives predictable acceleration characteristics when paired with the drive controller, and its overall weight of 12.9 kg supports stable operation in demanding spindle applications. Motor length code N corresponds to the stack height selected for the required power density. The rotor design follows DIN 913 for the threaded pins used in axial locking hardware, ensuring interchangeability during assembly and service.