Product Description:

The 1MS160N-4B-A1 is a stator subassembly built by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a replacement part or initial-build component, the stator pairs with a matching rotor to form a frameless spindle motor used in high-speed machining spindles and other precision automation axes. Its role is to generate the rotating magnetic field that drives the rotor while transferring thermal losses to an external coolant circuit through an integrated jacket. Because the stator is frameless, it is installed directly into the machine structure rather than into a complete motor housing.

This stator uses liquid cooling, which circulates coolant around the laminated core to keep winding temperature within limits during sustained high-speed duty. The mechanical envelope corresponds to a frame size of 160, which aligns the outside dimensions with standard spindle housings. Motor length code N identifies the active stack length and indicates the torque and power density available in this frame. Electrical performance is tied to winding variant 4B, which sets the phase resistance and current values used with compatible inverters. Heat is removed through an aluminum cooling jacket, which promotes efficient thermal transfer without adding unnecessary mass to the assembly.

Power leads exit through a 1.5 m loom that is routed out of the shaft end, giving enough length to reach a terminal box without additional splicing. The unit is supplied as a stator for a 1MB frameless spindle motor, so its alignment features match the rotor and bearing carriers used in the assembly. This helps maintain concentricity and an accurate air gap during installation, and it supports reliable high-speed operation in automated production equipment. The lead arrangement also helps keep cable routing clear of rotating parts after the spindle is assembled.