Product Description:

The 1MS160F-4E-A1/S046 is a stator subassembly produced by Bosch Rexroth Indramat for use within the 1MB High-Speed Asynchronous Motors series. Supplied as a frameless component, this stator forms the active electromagnetic section of a high-speed spindle motor and mounts directly inside the machine tool housing. Its role in industrial automation is to generate the rotating magnetic field that drives the matching rotor, allowing precision machining, drilling, or grinding processes to reach elevated surface speeds with controlled torque.

The stator ships with a 1.5 m loom that exits through the rear of the housing, minimizing external junctions and simplifying cabinet wiring. Heat generated by copper losses is removed through liquid cooling, which circulates fluid around the laminated core for stable temperature even at maximum frequency. Dimensional sizing begins with frame size 160, which matches the outer diameter used with standard spindle bearings, and motor length code F, which sets the active stack length for the required power density. Electromagnetic characteristics are set by winding variant 4E, which gives the phase resistance and inductance values used for high-frequency inverter operation. The magnetic core is enclosed in an aluminum cooling jacket that combines low mass with high thermal conductivity while protecting the windings from coolant ingress.

As a stator for a 1MB frameless spindle motor, the component is intended to slide over the rotor body without end bells, enabling compact headstock designs. Clearance channels in the iron stack accommodate the cooling circuit, letting the machine builder route supply and return lines parallel to the axis and maintain balanced flow. A molded grommet secures the connection bundle at the stator end, preventing vibration-induced abrasion and keeping encoder, power, and sensor leads strain-relieved during rapid spindle acceleration.