Product Description:

Bosch Rexroth Indramat supplies the 1MS160B-4A-A1/S010 stator for frameless spindle assemblies in the 1MB High-Speed Asynchronous Motors series. This component forms the stationary electromagnetic field needed to rotate a high-speed spindle shaft once it is paired with its matching rotor. In automation cells, it serves as the torque-generating element for milling, drilling, or positioning operations where quick acceleration and exact speed control are required.

The stator is cooled by liquid cooling, which circulates coolant through the outer jacket so the copper windings can handle high current density without exceeding insulation limits. Its mechanical envelope corresponds to a 160 frame size, providing a mounting diameter that fits mid-range machine tool housings while leaving room for the coolant passages. Electrical behavior follows winding variant 4A, which sets the spindle’s base voltage and current relationship for high-speed operation. Power enters through a 1.5 m loom, giving enough length for connection inside the cabinet without splices. The winding impedance and sensor set are suitable for third-party drives, allowing the stator to operate with non-Rexroth inverters.

The motor length code B indicates a medium active stack that balances continuous power against axial space inside the spindle housing. Thermal extraction is aided by an aluminum cooling jacket, whose high conductivity works with the liquid circuit to level temperature gradients across the frame. For condition monitoring, the winding pack carries NTC resistors, PTC resistors, and bimetals, allowing the external drive to respond before overload temperatures are reached. The pre-terminated loom leaves the housing through the stator end, so the coolant manifold and sensor connectors can be arranged on the same side and potential leak paths are kept low.