Product Description:

The 1MS200D-4B-A1 is a stator unit engineered by Bosch Rexroth Indramat for use in the 1MB High-Speed Asynchronous Motors series. Integrated into frameless spindle assemblies, this component supplies the rotating magnetic field that interacts with a separate rotor to generate spindle torque in automated milling, drilling, and grinding equipment. It is intended for direct integration into machine heads where space is limited and thermal stability is essential for high-speed toolpaths. Because the stator is installed directly into the surrounding structure, the machine housing becomes an important part of overall rigidity and heat flow. That layout also reduces the bulk associated with a separate motor housing and supports compact spindle construction.

The stator controls heat with liquid cooling, which maintains winding temperature during prolonged high-frequency operation. Thermal transfer is aided by its aluminum cooling jacket, an extruded shell that routes coolant around the active laminations for rapid heat exchange. The unit uses frame size 200, allowing it to fit housings prepared for 200-series diameters. It also has length code D, which indicates an extended stack that increases magnetic path area and continuous power density compared with shorter stack lengths. Electrical behavior is tailored by winding set 4B, selected for low loss at elevated switching frequencies so the paired inverter can support rapid speed changes with controlled current ripple. Stable temperature control also helps the spindle maintain predictable running conditions during long machining cycles.

Power reaches the winding through a dedicated connection cable. It is supplied as a 1.5 m loom that exits through the stator end for direct routing to a spindle inverter without intermediate junctions. This arrangement simplifies wiring inside compact headstocks and reduces electromagnetic interference by avoiding splices. The unit is a stator for a 1MB frameless spindle motor, so it must be installed only after the surrounding machine structure has been machined to tolerance. Accurate seating supports proper alignment between the stator bore and the rotor air gap, which is important for smooth magnetic performance at high speed. Correct integration also helps maintain clear internal routing and steady operation during continuous use.