Product Description:

The 1MS310B-6B-A2 is a stator unit built by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It forms the stationary half of a frameless spindle assembly and produces the electromagnetic field needed to drive the matching rotor in machining centers, grinders, and other automated equipment that operate at high rotational speeds. Because the stator is integrated directly into the machine housing, the design removes the need for a separate external motor frame and helps preserve a compact spindle layout. This arrangement is commonly used where high speed, rigid installation, and accurate thermal control are important to overall machine performance.

The cooling method is liquid cooling, which helps maintain winding temperature during sustained high-speed operation. Heat is carried away through the stator’s aluminum cooling jacket, and the stator construction uses a single-piece machined housing to help reduce the risk of leakage. Power is delivered through a 1.5 m loom that exits through the stator end, which keeps the cable path close to the spindle structure and supports orderly routing inside the machine. The unit uses Frame Size 310, providing proportions suited to large spindle-bearing arrangements and installations that require a substantial stator outside diameter.

The stator depth follows length code B, which sets the active core length within this frame size. Electrical characteristics are matched to winding variant 6B, which sets the conductor arrangement needed for the intended current and frequency range of the associated drive inverter. When paired correctly with the rotor and control system, the stator can support stable torque production across demanding spindle duty cycles. The liquid-cooled housing also helps the assembly manage thermal load during continuous operation, especially in applications where spindle speed remains high for extended periods.