Product Description:

The 1MS375D-6B-A2 stator is produced by Bosch Rexroth Indramat and belongs to the 1MB High-Speed Asynchronous Motors line for compact, frameless spindle assemblies. As the stationary magnetic core, it works with a separate rotor to create the rotating field required for high-speed machining centers, grinding heads, automated tool changers, and other spindle-driven assemblies that need precise speed control. Integrating the active motor element directly into a spindle cartridge shortens the powertrain, lowers moving mass, removes external belt transmissions, and helps support rigid spindle layouts with direct torque transfer.

Power conductors exit through a 1.5 m loom at the stator end, which simplifies internal spindle wiring and reduces the number of separate connectors inside the machine. Heat is removed by liquid cooling that circulates around the stator jacket, allowing continuous operation at elevated speeds while helping control winding temperature and thermal growth during long machining cycles. The core uses frame size 375, and length code D indicates the axial stack used for this motor format. An aluminum cooling jacket bonded to the laminations increases stiffness, improves heat transfer to the coolant circuit, and helps maintain a more uniform temperature across the stator body.

Winding variant 6B sets the turn count and impedance for use with common spindle inverters while limiting current ripple and supporting smooth electromagnetic operation. The unit is supplied as a stator for a 1MB frameless spindle motor, so the rotating element is installed separately to complete the motor assembly. This arrangement allows the shaft and bearing layout to be matched to the spindle geometry, keeps the motor closely integrated with the cartridge, and avoids the added bulk of a separate external motor housing.