Product Description:

The 1MR160N-B074/S001 rotor is manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. This component forms the rotating element of a frameless spindle motor, allowing machine tool builders to embed the drive directly into a housing for compact, high-speed cutting operations. Within industrial automation, the rotor interacts with a stator to convert electrical energy into mechanical rotation suited for milling, grinding, or drilling spindles where stable torque and smooth acceleration are required. Because it is intended for frameless integration, the surrounding machine structure must supply the bearing arrangement, enclosure, and overall spindle support.

At its electrical operating point, the rotor, when paired with the matching stator, enables a rated output of 14 kW. That power is achieved at a synchronous speed of 1500 rpm, providing enough surface velocity for medium-speed machining spindles. The electromagnetic design yields a continuous shaft torque of 89 Nm, so cutting forces remain consistent without stall. Current demand at nominal load is 26 A, a value that helps guide inverter sizing and cable selection, while the insulation system allows momentary peaks up to 67.76 A during acceleration or transient cut engagement without demagnetization. These values also influence thermal loading in the drive package and affect coolant flow and sensor placement in the surrounding headstock.

Mechanical dimensions support integration in compact frames. The cooling sleeve extends 385 mm along the rotor axis and uses an open aluminum construction to maximize heat transfer through water cooling. The outer lamination circle measures 180 mm in diameter, which matches frame size code 160 and Motor Length Code N for this variant. Because the part carries only primary insulation and no terminal box, its protection classification remains IP00, so enclosure sealing must be provided by the machine builder. The open assembly depends on the surrounding spindle housing to provide contact protection and resistance to contamination during operation.