Product Description:

The 1MS270C-4B-A1/S010 is a stator component manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a frameless spindle motor element, it is installed directly inside machine tool housings where it generates the rotating magnetic field that drives a separate rotor. Because the stator is fixed in the housing while the rotor is mounted on the spindle shaft, the assembly supports compact high-speed spindle construction without a conventional motor housing. The modular stator design simplifies integration into high-speed spindles used in milling, grinding, and drilling centers across industrial automation.

This stator employs liquid cooling, and the circulating coolant extracts heat directly from the windings to maintain thermal stability during prolonged high-speed operation. This cooling method helps the winding temperature remain more stable during long production runs and repeated speed changes. Heat transfer is improved by an aluminum cooling jacket that surrounds the laminated core and offers high thermal conductivity. The mechanical envelope uses frame size 270, giving a fixed outside diameter that matches compatible spindle housings, while motor length code C sets the axial length and related torque capacity. Power and sensor conductors exit through a 1.5 m loom that routes out of the stator end, reducing internal wiring runs and simplifying connection to the control cabinet.

The winding variant is 4B, allowing the stator impedance and rated speed to be matched with selected inverters. Embedded thermal protection is provided by NTC resistors for continuous temperature monitoring and PTC resistors that switch at a set threshold to signal overtemperature events; supplemental bimetals provide a redundant mechanical trip. Using both sensor types allows continuous measurement and a separate switching response within the same stator assembly. The electrical design remains open for use with third-party drives, so the stator can be paired with compatible frequency converters from other sources when required.