Product Description:

The 1MS160N-4B-A1/S046 is a stator subassembly manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Supplied as a frameless component, it is paired with a matching rotor to form a high-speed spindle drive for machining centers and other automated production equipment. Within the assembled motor, the three-phase winding generates the rotating magnetic field that produces torque and supports accurate speed control during demanding industrial operation. Because the stator is supplied separately from the rotor, the motor can be built directly into the spindle housing instead of using a complete housed motor.

Its integrated 1.5 m loom exits through one stator end, allowing the connection cable to reach the motor terminal strip without intermediate splices. This arrangement reduces the need for internal cable joints and helps preserve insulation continuity between the winding leads and the external connection point. Heat generated in the windings is removed by liquid cooling, with coolant circulating around the laminated core to keep operating temperature stable during continuous high-speed duty. The stator uses frame size 160, which sets the outside diameter and mounting circle, while length code N indicates the axial stack used for this power level. An aluminum cooling jacket surrounds the winding package, improving heat transfer and adding rigidity to the housing under vibration.

The unit is identified as a Stator for 1MB Frameless Spindle Motor, so it can be integrated directly into spindle assemblies that use a separate rotor and bearing system. Its electrical behavior is set by winding variant 4B, which uses the conductor size and coil arrangement assigned to this version. That winding layout supports stable magnetic performance across the operating range of the completed spindle. The subassembly format also lets the surrounding spindle structure carry the main mechanical loads, since the stator is intended to provide the electromagnetic portion of the motor rather than a complete bearing-supported assembly.