Product Description:

The 1MS160F-4E-A1/S045 is a frameless stator element built by Bosch Rexroth Indramat for integration into the 1MB High-Speed Asynchronous Motors series of spindle drives. As the stationary portion of a high-speed motor, this part channels three-phase excitation into the rotor to generate the torque needed for milling, turning, or grinding spindles used in automated machine tools. Its open construction allows the machine builder to mount the rotor directly on the application shaft while nesting the stator within a compact housing. This arrangement supports spindle assemblies that need high rotational performance without the added bulk of a fully enclosed motor housing.

The stator uses liquid cooling through an internal jacket that circulates coolant to remove loss-related heat before it reaches the lamination stack. This jacket is formed by an aluminum cooling jacket, whose high thermal conductivity helps equalize temperatures around the circumference. Electrical terminations arrive as a 1.5 m loom that is factory-assembled and protected as it exits through the stator end. The unit has a Frame size 160, so its outside diameter, bolt circle, and mounting shoulders correspond to other 1MB components of the same size. This supports consistent fit inside the spindle housing and reduces the need for custom shims or adapter rings.

The winding is identified by Winding variant 4E, which sets the effective voltage constant and current demand for high-frequency inverter operation. The stator uses Motor length code F, giving the iron stack the mass required for the requested continuous power while keeping spindle packaging compact. Assembly documents describe the unit as a Stator for 1MB Frameless Spindle Motor, and the build type is listed as Stator construction. These coded values help match the stator with compatible rotor cores, encoder rings, and coolant manifolds so the finished spindle can maintain the intended electrical and thermal behavior during operation.