Product Description:

The 1MS200D-4C-A1 is a stator assembly that belongs to the 1MB High-Speed Asynchronous Motors series from Bosch Rexroth Indramat. As the stationary portion of a frameless spindle motor, it creates the rotating magnetic field that drives the matched rotor at high surface speeds required in metal-cutting and composite machining centers. When combined with the appropriate rotor and position feedback, this stator delivers the torque density, acceleration, and thermal behavior needed for precision CNC spindles on liquid-cooled platforms. Because the stator remains fixed in the machine housing while the rotor turns inside it, the assembly supports contact-free torque generation with very low mechanical complexity in the magnetic section.

From Bosch Rexroth Indramat, the unit is part of the 1MB High-Speed Asynchronous Motors series and includes a factory-terminated 1.5 m loom routed through the stator end to keep cable exits clear of bearing seats. A liquid cooling circuit runs around the stator core to remove copper and iron losses directly at the heat source, which helps the spindle maintain stable operating temperatures during sustained high-frequency use. The mechanical interface uses frame size 200, referring to the outside diameter of the laminated stack and its matching housings. This format lets the stator fit standard 200 mm machine frames while preserving room for coolant passages and sensor wiring. Routing the loom through the end of the assembly also helps keep the bore area unobstructed for rotor installation and preserves clearance around the surrounding spindle cartridge.

The active axial package uses length code D, indicating the iron length and the continuous power range available from the magnetic circuit. Heat transfer to the machine chiller is improved by an integrated aluminum cooling jacket that surrounds the laminations and promotes uniform temperature distribution during long production runs. Winding variant 4C sets the voltage, current, and impedance values used with compatible Rexroth high-speed inverters. Uniform heat removal across the laminations helps limit thermal distortion, which supports tighter air-gap control and more consistent spindle behavior at elevated speeds. As a complete stator for 1MB frameless spindle motor systems, the component combines the laminated core, coolant management, and preinstalled conductors in a single drop-in package.