Product Description:

The 1MS160F-4A-A1 is a stator subassembly from Bosch Rexroth Indramat in the 1MB High-Speed Asynchronous Motors series. It is intended for integration into frameless spindle drives, where the rotor mounts directly on the machine shaft for compact, high-speed operation in milling, grinding, or boring heads. Because only the stator is supplied, the rotating side can be kept lighter while the motor still uses standard 1MB electromagnetic geometry for predictable torque and thermal behavior. This arrangement also gives the machine structure more freedom in how the spindle is packaged around the shaft and bearings.

An integrated connection loom measuring 1.5 m exits through the non-drive end of the housing, so power conductors can be routed without external junction boxes. Process heat is removed by liquid cooling, which helps keep copper temperatures stable during prolonged high-speed duty cycles and supports higher continuous power density than comparable air-cooled stators. The unit uses frame size 160, and its motor length code F indicates a mid-range active stack length that balances torque capacity with installation space. Thermal transfer to the coolant circuit is supported by an aluminum cooling jacket around the stator teeth, providing a conductive path from the winding slots to the coolant channels.

The electromagnetic layout uses winding variant 4A, so its resistance and inductance values align with drive inverters tuned for rapid spindle acceleration. Delivered as a stator for a frameless spindle motor, the unit leaves rotor geometry and bearing support to the machine design rather than imposing a complete housed motor structure. This arrangement is useful in spindle assemblies that need a compact envelope, controlled thermal flow, and direct integration with the driven shaft. It also avoids surplus housed-motor parts when the spindle already has its own support structure.