Product Description:

The 1MS376B-QA-A1 is a stator assembly produced by Bosch Rexroth Indramat for integration into the 1MB High-Speed Asynchronous Motors series. As a frameless spindle motor stator, it forms the stationary magnetic field that works with a matching rotor to generate torque in high-speed milling, grinding, and turning spindles. In automated machine tools, it is installed directly into the spindle structure, where accurate electromagnetic geometry supports stable speed control, consistent cutting performance, and smooth integration with precision spindle assemblies over long operating periods.

With a 376 frame size and the B length code, the stator uses a medium-large laminated core and winding package suited for spindle housings with matching diameter and axial depth. The cable system exits on the stator side, and its orientation is radial, so the power and sensor harness can turn toward the machine junction box without wrapping around the housing. The lead set has a larger outside diameter, allowing thicker insulation and conductor cross-sections that help reduce resistive losses at high current. This layout also leaves room around the stator body for nearby coolant passages and bearing seats.

The supply lead is delivered as a 1.5 m loom routed through the stator end, which simplifies internal connection and avoids extra splice points inside the spindle head. Thermal control relies on liquid cooling, and the cooling jacket is positioned in the housing so coolant can circulate close to the active iron and remove Joule and eddy-current losses quickly. The jacket uses aluminum cooling jacket sections that promote uniform heat transfer and resist corrosion from water-glycol blends. Stable thermal behavior helps limit spindle growth during continuous high-speed duty and supports winding life under sustained load.