Product Description:

The 1MS160B-4A-A2 is produced by Bosch Rexroth Indramat within the 1MB High-Speed Asynchronous Motors series. It is supplied solely as a stator assembly so that machine builders can integrate it with a matching rotor to create a high-speed spindle drive for milling, grinding, or drilling centers. This arrangement allows the spindle package to be adapted to the machine structure without altering the stator itself. By housing the active windings and the coolant channels, this component anchors the electromagnetic circuit and removes heat, allowing the finished motor to maintain constant torque output during continuous machining cycles.

The stator is thermally managed by liquid cooling, which transfers heat through an internal aluminum cooling jacket. This metal sleeve surrounds the laminations and conducts heat directly to the coolant stream for stable winding temperatures during extended operation. Mechanical sizing is governed by frame size 160, so the outside diameter and mounting interfaces match other 160-frame spindle parts. Power and feedback conductors exit the housing on a 1.5 m loom routed through the non-drive end of the stator, which simplifies cabinet wiring and strain relief. Electrical performance is tailored by winding variant 4A, which sets the rated voltage, current, and base speed range for compatible inverter families.

This assembly is a dedicated stator, and its axial package uses motor length code B. The code corresponds to the lamination length and copper content available in the housing. When combined with the appropriate rotor, the unit forms a high-speed frameless spindle motor that fits directly into a machine headstock without additional bearing carriers. The integrated coolant passages align with the machine's chiller circuit, which helps keep thermal growth predictable so tool position accuracy remains within tight tolerances during demanding duty cycles.