Product Description:

The 1MS200H-4B-A1 is a stator subassembly manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It serves as the stationary field generator inside a built-in spindle assembly used in high-speed milling, grinding, or routing applications where precise electromagnetic torque and compact installation are required. Because the stator is supplied as a dedicated internal assembly, it is intended to be integrated into a machine-specific spindle housing rather than used as a standalone motor.

This unit uses liquid cooling, so coolant circulates around the stator housing to remove loss-generated heat and keep winding temperatures within allowable limits during continuous high-speed operation. A factory-installed connection cable measures 1.5 m and exits through the stator end, which simplifies electrical termination inside the spindle barrel. The thermal sleeve is an aluminum cooling jacket that provides good conductivity between the windings and the coolant path. The unit has frame size 200, so its outside diameter and bolt circle match other 1MB components in the same size group. The 4B winding variant uses a specific slot fill, wire gauge, and turns count to match the target voltage constant and current loading of compatible inverters.

The motor length code H indicates a long active stack that increases copper volume and supports greater continuous power density without changing the frame diameter. As a stator for a 1MB frameless spindle motor, the assembly is supplied without bearings or a rotor, allowing direct installation into a custom spindle housing while maintaining concentricity with the selected shaft system. This layout gives the machine builder flexibility in bearing arrangement and spindle construction. It also allows the rotating assembly and housing to be matched to the application's speed range, stiffness, and thermal path.