Product Description:

The 1MS241H-6D-A1/S028 is a stator subassembly produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the stationary electromagnetic element of a high-speed spindle drive, it generates the rotating field needed to accelerate a matching rotor once installed in a machine tool. This layout supports direct-drive spindle designs that reduce the overall housing envelope while maintaining the response needed for high-speed cutting and grinding processes. It is intended for machine builders that integrate the motor structure directly into the spindle assembly rather than using a separate housed motor.

It is supplied with a 1.5 m loom routed through the stator end, so power and sensor leads leave from one side of the assembly and can be guided through the machine structure. Heat from the windings is removed by liquid cooling, which supports sustained operation at high current density and helps stabilize temperature during demanding duty cycles. The core uses frame size 241, and the longer magnetic path of motor length code H increases axial stack depth without enlarging the frame diameter. Electromagnetic behavior is set by winding variant 6D, which is tuned for high base frequency and low leakage inductance in spindle applications. Mechanical protection comes from a stator with an aluminum cooling jacket that encloses the laminations and provides an external coolant channel.

As a stator for a 1MB frameless spindle motor, this component interfaces directly with a precision rotor and a compatible external inverter. The open integration concept gives the spindle designer control over bearing arrangement, shaft layout, and housing geometry while keeping the electromagnetic section compact. Tight slot geometry helps maintain a uniform air gap during high-speed rotation, which supports smooth torque production and stable spindle behavior. The unit is suited to machine tools that need high rotational speed, compact installation, and predictable thermal management inside the spindle housing.