Product Description:

The 1MS310B-6B-A2/S010 stator is manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a stator, it remains stationary while its paired rotor turns, generating the rotating magnetic field required for precise spindle acceleration and consistent speed regulation in machining or grinding lines. Because the series targets very high peripheral speeds, the unit is intended to be built directly into machine-tool spindles where envelope space is limited yet torque density and thermal stability must remain high. In this arrangement, the laminated core and windings become part of the spindle body rather than a separate motor housing, which helps keep the rotating assembly compact.

The stator has a frame size of 310, giving a large bore for rigid rotor support while maintaining generous slot area for copper conductors. The larger active area also supports the current-carrying conductors needed for stable torque production across a wide speed range. The electromagnetic package uses length category B, which balances axial footprint with heat dissipation. Within the slots, the windings use variant 6B, a coil pattern chosen for low leakage inductance at elevated switching frequencies. Heat generated by copper losses is removed through liquid cooling, and power reaches the winding through a 1.5 m loom routed from the stator end, which helps simplify cable routing to the drive cabinet.

The core is enclosed in an aluminum cooling jacket, so coolant passes directly along the outer surface and keeps thermal gradients low across the assembly. For temperature monitoring, the stator includes NTC resistors, PTC resistors and bimetals, allowing both continuous sensing and discrete trip protection. These sensing elements can trigger protective responses if winding temperature rises during overload or coolant loss. The electrical design is suitable for third-party drives, so the unit can operate with many commercially available inverters. Its dedicated function as a stator for a 1MB frameless spindle motor matches the mechanical tolerances of the corresponding rotor hubs and bearing sets.