Product Description:

The 1MS375B-6B-A1 stator is supplied by Bosch Rexroth Indramat as part of the 1MB High-Speed Asynchronous Motors series. It is the stationary core of a frameless spindle motor used in industrial automation to generate the rotating magnetic field that drives high-speed machine tool spindles directly. Integrating the stator inside the spindle housing eliminates belts and gearboxes, which shortens response times, improves positional accuracy, and reduces drivetrain compliance in milling, drilling, and grinding centers.

Dimensionally, this model occupies frame size 375, giving a large bore for coolant channels and ample slot area for conductors. Axial depth uses motor length code B, a mid-range size that balances torque capability with envelope limits common to CNC headstocks. The winding layout follows winding variant 6B, matching impedance to high-frequency inverters and limiting harmonic losses. Continuous-duty heat is extracted through liquid cooling, where pressurized glycol or water removes copper and iron losses. That coolant circulates against an aluminum cooling jacket, whose thermal conductivity accelerates heat transfer while adding minimal mass.

Electrical leads are bundled into a 1.5 m loom that exits the stator end, permitting straightforward routing to terminal blocks without splices. As a stator for a 1MB frameless spindle motor, it is paired with a separate rotor and bearings, allowing machine builders to select shaft and inertia details that suit the spindle assembly. It is intended for use with Bosch Rexroth Indramat drive controllers that regulate spindle speed and monitor operating conditions during sustained operation. This arrangement supports the stationary magnetic field needed for rapid acceleration and high surface speeds in precision metal-cutting applications.