Product Description:

The 1MS160F-4B-A1 is supplied by Bosch Rexroth Indramat as a stator module within the 1MB High-Speed Asynchronous Motors series. As the stationary armature of a frameless spindle motor, it forms the electromagnetic field that drives the rotor in machining spindles and other high-speed automation axes. By separating the stator from a complete motor housing, machine builders can integrate this part directly into custom mechanical frames to shorten overall spindle length and lower rotating mass. This arrangement is useful in spindle designs that need a short nose section and low inertia near the rotating assembly.

The stator employs liquid cooling, so coolant channels remove heat directly from the lamination stack and allow continuous operation at elevated load points. Its frame size 160 sets the outside diameter, giving designers a fixed mounting circle for bearing seats and housing bores. The motor length code F denotes an axial stack that increases active copper volume compared with shorter variants of the same diameter, raising achievable torque. Electrical behavior is set by winding variant 4B. This code indicates a wire gauge and turn count that align the resistance and inductance with standard Rexroth spindle inverters. An aluminum cooling jacket surrounds the lamination core, creating an efficient thermal path between the embedded windings and the external coolant flow.

A factory-installed 1.5 m loom exits through one stator end, giving sufficient length for power and sensor terminations without additional junctions. This preassembled harness keeps leads away from coolant fittings and supports clean routing inside the spindle assembly. It also helps keep the rotor space unobstructed where a compact spindle layout is required. The stator serves as the electromagnetic section of the spindle drive, while the surrounding mechanical envelope is supplied by the machine structure.