Product Description:

The 1MS200D-4D-A1 is a stator subassembly produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a frameless component, it is inserted directly into a spindle housing. There it forms the stationary field generator that works with a matched rotor to deliver high rotational speeds in automated machining centers and other motion platforms. In operation, the stator remains fixed while the rotor turns inside the surrounding spindle assembly. This arrangement reduces the need for a separate motor housing around the spindle and helps preserve space for bearings, tool interfaces, and other machine elements.

Heat removal is handled through liquid cooling, and the stator body incorporates an aluminum cooling jacket that routes coolant directly around the laminations to keep winding temperature within operating limits during prolonged high-speed duty. The mechanical footprint is identified by frame size 200, which indicates the outside diameter and bolt circle used when the unit is pressed into the spindle sleeve. Length code D indicates the axial stack height, so torque capability scales with this dimension. Winding variant 4D sets the wire gauge and turns per phase for the voltage and frequency ranges supported by standard Rexroth spindle inverters. Routing coolant close to the laminations supports stable thermal behavior during long machining cycles and helps the stator maintain consistent magnetic performance at elevated spindle speeds.

Power and feedback conductors exit the active end of the stator through a preterminated 1.5 m loom, reducing loose wiring and helping protect the leads against vibration. Because the item is a Stator for 1MB Frameless Spindle Motor, it ships without an end bell, bearings, or rotor. Those parts are supplied by the surrounding spindle assembly rather than by the stator itself. The active-end lead exit also helps preserve radial space around the housing, which is useful in tightly packaged spindle designs. The Bosch Rexroth Indramat 1MB High-Speed Asynchronous Motors series uses this frameless format for spindle assemblies that integrate the motor directly into the machine housing.