Product Description:

Bosch Rexroth Indramat builds the 1MS375B-6B-A2/S010 as part of its 1MB High-Speed Asynchronous Motors series. The unit is a stator for frameless spindle designs and forms the stationary electromagnetic core that interacts with a rotor to generate torque in high-speed machining spindles and other automated tooling. By supplying only the stator, the manufacturer allows machine builders to package the active winding system directly inside custom housings, saving space while retaining the dynamic characteristics expected from the 1MB platform.

The stator channels heat away through liquid cooling, allowing continuous operation at elevated speeds without exceeding insulation limits. A compact profile is maintained because the active laminations fit a frame size 375 envelope, so the outside diameter can fit into large-capacity spindle housings without extra adapters. Electrical power is delivered through a pre-terminated harness, and the 1.5 m connection cable exits the stator end to simplify routing toward an external inverter. The selected winding variant 6B sets the torque and voltage constants, giving the drive a predictable current requirement during operation. The motor length code B indicates the axial stack length, which influences continuous output power in the finished spindle assembly.

The magnetic circuit is encased in an aluminum cooling jacket that promotes uniform coolant flow and minimizes thermal gradients across the winding heads. Embedded temperature monitoring comes from NTC resistors, PTC resistors, and bimetals, and these devices feed back to the drive so it can limit current if internal temperatures rise. The design is suitable for third-party drives, allowing use with any inverter that supports the necessary current and frequency range. Because it is supplied as a stator for a 1MB frameless spindle motor, mechanical designers can combine it with custom rotors, bearings, and encoder stacks to create high-speed spindles tailored to specific machining centers.