Product Description:

The 1MS241H-6A-A1 stator is manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a frameless assembly component, it forms the stationary magnetic field source that interacts with a matched rotor to drive spindle shafts in milling, drilling, and grinding centers. By eliminating an outer housing, the stator can be embedded directly into the machine headstock, reducing overall spindle diameter and enabling the high rotational speeds demanded in industrial automation cells. This arrangement supports compact spindle construction and leaves the surrounding machine structure to provide the final mechanical support.

A liquid cooling circuit removes resistive losses and keeps winding temperature stable during sustained spindle operation. The magnetic core is retained inside a stator body with an aluminum cooling jacket, a lightweight structure that transfers heat efficiently to the coolant. Frame size 241 sets the outside diameter and mounting circle so the unit fits larger high-power spindles. Length code H indicates an extended active stack length that increases continuous torque, while winding variant 6A identifies the conductor gauge and number of turns associated with the phase resistance and voltage rating. The longer active section also supports higher continuous output than shorter stack options of the same diameter.

The electrical interface leaves the stator through a 1.5 m loom that is already routed out of the non-drive end, reducing assembly time and protecting cable insulation from contact with rotating parts. Because the unit is delivered as a stator for a 1MB frameless spindle motor, it mounts directly into the surrounding machine structure around the laminated rotor core. It is supplied separately, so the assembly can be paired with custom rotor and bearing packages without changing the electrical design. This arrangement gives spindle designers flexibility when matching inertia, bearing preload, and sensor integration to the intended machining process in high-speed machine tools.