Product Description:

The 1MS160N-4B-A1/S045 is a stator subassembly produced by Bosch Rexroth Indramat for integration into 1MB high-speed asynchronous motors. As a frameless component, it is fitted directly into the machine spindle housing, where it supplies the primary electromagnetic field needed for high-speed machining centers and other automated tooling. Its role is to generate torque once the matching rotor is installed, allowing a compact, liquid-cooled spindle arrangement without the addition of a full motor frame.

This stator relies on liquid cooling, with coolant circulating through external channels to remove copper and iron losses so thermal drift stays minimal even at elevated duty cycles. The mechanical envelope is governed by frame size 160, which determines the outside diameter and compatibility with matching 1MB rotor kits. Electrical performance is tuned by the 4B winding variant, which sets the resistance, inductance, and base speed range for drive sizing. Power and feedback wiring leave the unit through a 1.5 m loom, eliminating intermediate terminal boxes and reducing assembly complexity. To improve heat exchange, the lamination stack is encased in an aluminum cooling jacket that directs liquid evenly around the circumference.

The dimensional depth is indicated by motor length code N, a mid-length build that balances continuous power against overall shaft span. The unit is supplied as a stator for 1MB frameless spindle motor, so alignment pins, end shields, and sensors are provided separately as part of the surrounding spindle assembly. Cable egress follows stator end routing, allowing hoses and wiring to remain inside the spindle housing without external loops. It belongs to the 1MB high-speed asynchronous motors series and is intended for compact spindle assemblies used in automated machine tools.