Product Description:

The 1MR200H-A060/S026 is a rotor subassembly produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Intended for frameless spindle integration, the component forms the rotating core of a high-speed induction motor and transfers electromagnetic torque to the tool shaft in machining centers and similar automation equipment. It is supplied without a stator or housing and is meant to be press-fitted into a machine-specific carrier.

Key dimensional data establish how the rotor interfaces with the machine. It belongs to frame size 200, and its H length code indicates an extended axial stack for higher power density. The shaft passage has a 60 mm bore, which clears typical drawbar assemblies. The rotor uses 2 pole pairs, which supports high base speeds when driven by a matched inverter. Dynamic response is influenced by a mass moment of inertia of 0.069 kgm², a moderate value that helps shorten acceleration times while still storing enough kinetic energy for cut stability. The total rotating weight is 26 kg, so spindle bearings must be sized for that load during operation.

The rotor relies on liquid cooling provided by the surrounding stator jacket, allowing continuous operation at elevated peripheral speed without excessive heat soak. It has a protection class of IP00 because the element is enclosed only after installation and depends on the machine housing for contamination barriers. The recommended ambient operating range is 0 to 40 °C, because magnetic losses and lubricant viscosity can change outside that range. During storage or shipment, the assembly tolerates temperatures from -20 to +80 °C without degradation. A step interference fit along the outer surface secures the rotor to the shrink-fit carrier and helps maintain concentricity at maximum speed.