Product Description:

The 1MS241H-6D-A2/S010 is a stator for a 1MB frameless spindle motor produced by Bosch Rexroth Indramat within the 1MB High-Speed Asynchronous Motors series. Serving as the stationary part of a high-speed spindle, it generates the rotating magnetic field that drives the matching rotor and supports machining operations such as drilling, milling, or grinding in automated production equipment. Its frameless design allows direct installation into the machine structure, which helps reduce packaging space and keeps the thermal path short between the winding assembly and the coolant circuit at elevated speeds.

The stator uses liquid cooling, and heat is transferred directly to circulating coolant instead of the surrounding air. This thermal path is aided by an aluminum cooling jacket, a lightweight outer sheath that increases contact between the winding stack and the coolant channel. A preinstalled 1.5 m loom routed through the stator end carries power and sensor leads out of the assembly, reducing internal wiring work inside the spindle housing. Its mounting size follows frame size 241, a diameter class that matches other 1MB components of the same size. For thermal monitoring, the windings include NTC resistors, PTC resistors, and bimetals, allowing the drive to respond before insulation temperatures rise too far.

The electromagnetic layout uses winding variant 6D, a coil set selected for stable torque at the high synchronous speeds used in machining centers. The rotor cavity depth corresponds to motor length code H, which provides additional axial stack length for higher continuous power than shorter versions in the same series. The assembly is suitable for third-party drives, so it can be paired with compatible inverters when the required current and frequency ranges match the winding data. Compatible drive settings must also align with the stator’s thermal monitoring arrangement and operating characteristics.