Product Description:

The 1MS200D-4A-A1 is a stationary winding assembly from Bosch Rexroth Indramat within the 1MB High-Speed Asynchronous Motors series. It generates the rotating magnetic field inside a frameless spindle, working with a separate rotor to supply the torque and speed required by CNC machining centers and grinders. The compact module supports very high rotor velocities while keeping temperatures under control, making it suitable for continuous production lines that require tight cycle times.

Thermal management depends on liquid cooling, so coolant passes directly around the laminated core and removes Joule losses before they raise winding temperature. The stator is built on frame size 200, giving it an external diameter large enough to accommodate medium-power spindles without enlarging the headstock envelope. Electrical characteristics are set by winding variant 4A, which uses slot fill, resistance, and inductance values suited to 460 V inverters while still allowing high peak currents for rapid acceleration. A pre-terminated 1.5 m loom simplifies installation, and the conductors are routed through the stator end so the cable can be directed straight toward the terminal block, minimizing bends and electromagnetic interference.

The mechanical form factor uses motor length code D, which indicates the axial stack height and continuous power rating. An integrated aluminum cooling jacket surrounds the lamination stack and creates a closed liquid pathway, eliminating the need for an external heat sink or fan. Serving specifically as the stator for a 1MB frameless spindle motor, the unit stays fixed while the rotor spins inside. When paired with the corresponding rotor, this stator provides the electromagnetic interface needed for high-speed milling and drilling operations without adding excessive mass at the spindle nose.