Product Description:

The 1MS160F-4B-A1/S045 is a stator module supplied by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It forms the stationary electromagnetic section of a frameless spindle assembly and generates the rotating magnetic field that acts on the matching rotor when the motor is powered by a compatible inverter. Because the module is built for direct integration into spindle systems used in machine tools, robotic milling units, and grinding equipment, it supports high peripheral speed together with stable torque delivery during continuous industrial operation. The stator itself contains no rotating mass, which lets the surrounding spindle structure determine the final shaft, bearing, and sleeve arrangement.

The stator is supplied with a connection cable in a 1.5 m loom, giving the power leads enough reach for routing to the motor connection point without requiring an added extension in many layouts. Cooling is provided by liquid cooling, so internal coolant passages remove heat close to the windings and help the unit carry sustained current during long duty cycles. Frame size 160 identifies the outer diameter used for fitting the module into a matching spindle housing. Heat transfer is supported by an aluminum cooling jacket, which combines good thermal conductivity with corrosion resistance. This arrangement helps keep winding temperature more stable during rapid acceleration, repeated load changes, and extended production runs.

The stator uses length code F, which indicates the longest axial stack available in this frame and provides more active iron for higher torque density. Its electromagnetic behavior is set by winding variant 4B, balancing phase current and back EMF for use with compatible Rexroth drive converters. The module is supplied as a stator for 1MB frameless spindle motor, so it is intended to be paired with a separate rotor sleeve inside the finished spindle assembly. That layout allows the spindle to be configured for the required inertia and speed range while keeping the stator aligned with its cooling passages and electrical exit.