Product Description:

The 1MS376B-QA-A2/S041 is a stator element produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the stationary portion of a frameless spindle motor, it forms the electromagnetic core that interacts with a rotor to deliver high rotational speeds required in machine-tool spindles and other precision automation tasks. Integrating this stator allows builders to create compact, liquid-cooled drive units without using a complete housed motor, giving machine designers greater freedom when embedding spindle drives in tight machining envelopes. This frameless layout is useful where spindle mass, bearing placement, and available installation space must be balanced within a compact housing.

This stator is built for liquid cooling; coolant circulates through an integral aluminum cooling jacket so heat is removed directly at the copper windings. The thermal circuit tolerates a maximum operating pressure of 6 bar, supporting closed-loop chillers commonly found in machining centers. Because the assembly carries an IP00 protection class, it must be installed inside a sealed spindle housing where guarding is provided by the machine builder. Power and sensor conductors exit on the smaller stator end, which helps route cables through the spindle nose without loops projecting beyond the motor envelope.

Electrical continuity to the inverter is established through a 1.5 m pre-terminated loom, reducing on-machine soldering work and simplifying connection to the drive. The mechanical series code identifies this unit as length class B, which corresponds to the active lamination stack used for this stator. Operating on the asynchronous induction principle and wired for a 3-phase supply, the stator works with standard high-frequency spindle drives that modulate current to create a rotating magnetic field. This operating method supports compact spindle assemblies that run at high speed while maintaining controlled heat removal.