Product Description:

The 1MS200D-4E-A2/S025 stator is produced by Bosch Rexroth Indramat and belongs to the 1MB High-Speed Asynchronous Motors series. As the fixed electromagnetic section of a frameless spindle assembly, it generates the rotating field that drives the paired rotor when energized by an inverter. Within industrial automation, this configuration supports compact high-speed machining centers because the motor can be embedded directly into custom housings and bearing stacks.

A liquid cooling circuit runs through an external jacket, so heat is removed from the copper before it reaches the lamination stack and winding temperatures remain controlled during continuous high-speed duty. The stator shell incorporates an aluminum cooling jacket, chosen for its high thermal conductivity and low mass, which accelerates heat transfer toward the coolant. Power is supplied through a 1.5 m loom that exits at the stator end, giving sufficient reach for cabinet connections without intermediate splices. The stator uses frame size 200; this 200 mm outside diameter sets the mechanical envelope for clamping inside the spindle housing. Axial depth uses length code D, and this code sets the active stack height and influences achievable torque. The stator uses winding variant 4E, a coil design that balances current demand with the voltage rating of standard 400 V inverters.

When integrated into a spindle, the stator’s thermal and electrical features support stable machining accuracy. Using matching drive components, parameter sets can match the winding impedance, minimizing phase imbalance at high frequency. The surrounding machine structure provides the radial stiffness because the frameless motor body has no intermediate mounting flange, which helps keep shaft overhang short and rotor dynamics stable. Monitoring the coolant flow temperature inside the jacket can reveal scale buildup in the passages or reduced pump performance before winding insulation is stressed.