Product Description:

The 1MS140H-4B-A1 stator is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It is delivered as the stationary active element of a frameless spindle assembly, allowing the machine builder to mount the rotor directly on the shaft of high-speed grinders, machining centers, or woodworking spindles. This layout leaves the rotor, shaft, and bearing arrangement to the host machine, which helps the spindle match the stiffness and inertia needed by the application. By keeping the magnetic circuit inside the motor housing while the rotor is mounted on the machine shaft, the design supports compact integration and precise speed regulation in automated equipment.

Its power leads exit through the 1.5 m loom that is routed at the stator end, providing direct access without an external junction box. Heat produced by the copper windings is removed through liquid cooling, which circulates coolant around the laminated stack to stabilize temperature at full speed. The unit corresponds to frame size 140, so its outside diameter matches housings built for that geometric envelope. The unit uses winding variant 4B, which sets the conductor cross-section and turns count for the required voltage and current profile. This cable arrangement also lets the loom share protected routing paths with nearby sensor cabling in the spindle area.

The stator body incorporates an aluminum cooling jacket that forms the external coolant passage and minimizes thermal gradients between the teeth and housing. Overall axial length corresponds to motor length code H, providing additional slot depth for higher torque density than shorter codes. The coolant path is arranged as a low-resistance channel, so circulation can be maintained without excessive pressure loss in the machine's cooling loop. The laminate stack also supports a balanced magnetic field across the full active length, helping the stator maintain stable spindle performance during high-speed operation.