Product Description:

The 1MS240H-4A-A1 stator is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Serving as the stationary magnetic core of a high-speed spindle, it houses the copper windings that create the rotating field required by a matching rotor during spindle operation. Integrated into machine tools and other automated equipment, the unit allows builders to embed frameless spindles directly into the mechanical structure for compact, high-speed motion. Its stator-only format lets integrators select a rotor design that matches specific inertia or tooling interfaces.

Its thermal management relies on liquid cooling, which removes loss heat through jacket channels instead of ambient airflow. The stator uses frame size 240, giving it an outer diameter that aligns with correspondingly sized machine bores. Power and sensor conductors are pre-terminated in a 1.5 m loom that exits the housing, reducing on-site cable work. An external aluminum cooling jacket surrounds the lamination stack, coupling the windings to the coolant for stable temperature during continuous high-speed duty. This arrangement minimizes thermal gradients along the winding heads and supports predictable thermal expansion control across the active length.

The electromagnetic and geometric capacity is extended by motor length code H, which indicates a longer active core. Electrical behavior is tuned through winding variant 4A, allowing the stator to match the voltage and current ratings of the spindle inverter. Delivered as a stator for a 1MB frameless spindle motor, the assembly operates in a closed fluid circuit where coolant passes directly over the jacketed surface of the active stack. Such thermal stability is important when surface finish or dimensional tolerance must be held over extended runs at elevated spindle speed.