Product Description:

The 1MR140D-A045 rotor section is manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a frameless spindle motor component, it is pressed onto a machine-side shaft to transmit torque in milling, grinding, and drilling centers where compact, high-speed drive packages are required. The step interference fit allows the rotor to be heated, slid into position, and then locked by shrinkage, giving a rigid coupling that can sustain the elevated surface velocities required in automated metal-cutting systems.

This rotor supports a maximum mechanical speed of 23,000 min⁻¹, which is the upper limit for spindle frequency before centrifugal forces risk laminate separation. During assembly, up to 500 N of axial assist may be applied to seat the hub without distorting the stack. Dynamic behavior is influenced by a mass moment of inertia of 0.0061 kg·m², so rapid acceleration can be achieved while still providing flywheel energy for short load disturbances. The laminated core weighs 4.5 kg, and this value must be considered in bearing load calculations and vibration modeling. A machined bore of 45 mm centers the rotor on the shaft and establishes the interference required by the stepped geometry.

For mounting, the hub is expanded to 200 °C; this temperature produces enough radial growth to slide over the mating journal without galling. For future removal, a disassembly oil with a viscosity of 900 mm²/s is introduced between the fit surfaces, while a lighter float oil rated at 300 mm²/s is used for running clearance during spin testing. Residual imbalance is corrected with threaded compensation screws sized M5 × 5, allowing fine mass distribution without altering the magnetic circuit. These values keep the installation process clear and help maintain proper rotor fit during service.