Product Description:

The 1MS160F-4B-A1/S010 is a stator subassembly engineered by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the stationary element of a frameless spindle motor, it creates the rotating magnetic field that drives the rotor in high-speed milling and grinding spindles used throughout automated machining centers. Installed by the spindle builder before final balancing, the unit supplies the electromagnetic work inside compact housings and supports continuous duty cycles typical of industrial automation lines and precision machine tools.

The stator employs liquid cooling, so heat is removed directly from the copper windings, permitting higher continuous current without exceeding thermal limits. It is built on frame size 160, a diameter class that matches medium-power machine-tool spindles and standard bearing cartridges. Winding variant 4B sets the number of turns and conductor cross section, aligning the impedance with inverter outputs that favor elevated speed ranges. A pre-terminated 1.5 m loom exits through the stator end, reducing internal wiring time and avoiding sharp bends inside the shaft. Thermal energy flows outward into an integrated aluminum cooling jacket, whose low mass and high conductivity help keep temperature gradients small during prolonged operation.

Motor length code F indicates an axial core that balances torque density with overall spindle length, allowing builders to meet envelope constraints without derating. The assembly is suitable for third-party drives, giving OEMs freedom to select inverters from different suppliers while retaining full function. Built-in NTC resistors provide proportional temperature feedback, whereas complementary PTC resistors switch sharply at preset thresholds; together with internal bimetal strips, they support rapid shutdown if overheating is detected. This combination lets the temperature-monitoring circuit respond to both gradual heat rise and sudden overtemperature conditions.