Product Description:

The 1MS241H-6B-A1/S028 is a stator module manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the stationary section of a high-speed spindle motor, it generates the rotating magnetic field that drives the rotor in milling, drilling, and grinding equipment. It is supplied as a ready-to-mount lamination stack with integrated thermal surfaces, which helps machine builders install it in compact spindle assemblies with controlled fit and alignment. Because the rotor is installed separately, this stator format suits spindle designs where the motor must fit directly around the shaft and bearing system. That arrangement helps reduce the overall motor envelope and supports rigid machine-head layouts.

Careful machining of the core laminations helps keep the air gap uniform and supports stable magnetic performance at high rotational speeds. Heat is removed by liquid cooling, where circulating fluid carries losses away from the copper for continuous operation under demanding duty. The stator uses a 241 frame size, so its outside diameter matches compatible 1MB rotor components. An aluminum cooling jacket surrounds the core to transfer heat efficiently without adding unnecessary mass. The 6B winding sets the phase resistance and inductance used with matching spindle drives. Internally, coolant channels run along the full axial length to reduce temperature variation across the winding pack.

A pre-terminated 1.5 m loom exits from the non-drive end, which shortens internal wiring runs and simplifies routing inside the spindle housing. The cable exit at that end also helps keep connections away from the tooling side of the spindle, where available space is often limited. The H length code identifies the selected axial stack height for medium power output while keeping the same frame diameter. Supplied as a Stator for 1MB Frameless Spindle Motor, the unit mates with the corresponding rotor ring and bearing arrangement used in modular spindle assemblies. Its frameless layout allows the motor section to be integrated directly into the machine structure instead of using a separate housed motor.