Product Description:

The 1MR160H-A060 rotor is manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It is delivered as the rotating core of a frameless spindle motor for integration into machine-tool spindles and other high-speed assemblies. In these applications, the rotor generates direct-drive torque without a complete housed motor. This layout lets the spindle assembly carry the motor’s rotating element inside the machine structure rather than inside a separate motor housing.

This rotor uses frame size 160, matching the corresponding stator cavity in the 1MB series. The outer diameter is 106.3 mm with a -0.05 mm tolerance, providing a controlled interference fit that works with the step interference-fit design to maintain concentricity during thermal growth. Overall rotor length is 255 mm, while the bore measures 60.0 mm; this inside diameter accepts the machine spindle shaft and still leaves space for coolant or sensor lines routed through the center. A spindle taper of 30° is ground on the nose to accept standard tool-holding adapters for accurate power transmission to the cutting tool. The motor uses length code H, along with a 0.4 mm relief depth and a 5 mm maximum undercut width, so the part can seat properly against locking nuts and spacers.

The relief angle of 15° aids tool withdrawal by reducing friction at the transition from the taper to the cylindrical portion during assembly. The spindle must provide at least 257 mm of length to seat the rotor fully, and the extra length accommodates attachment of balancing hardware through a balancing-ring thread of M6. Lubrication lines connect through a pressure-oil port threaded M4x0.5, allowing oil injection to help limit bearing temperature at top speed and support the bearing area during continuous high-speed operation.